Browsing by Author "Favieres Ruiz, Cristina"
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Publication Open Access Application-oriented data analytics in large-scale metal sheet bending(MDPI, 2023) Penalva Oscoz, Mariluz; Martín, Ander; Martínez, Víctor; Veiga Suárez, Fernando; Gil del Val, Alain; Ballesteros Egüés, Tomás; Favieres Ruiz, Cristina; Ingeniería; IngeniaritzaThe sheet-metal-forming process is crucial in manufacturing various products, including pipes, cans, and containers. Despite its significance, controlling this complex process is challenging and may lead to defects and inefficiencies. This study introduces a novel approach to monitor the sheet-metal-forming process, specifically focusing on the rolling of cans in the oil-and-gas sector. The methodology employed in this work involves the application of temporal-signal-processing and artificial-intelligence (AI) techniques for monitoring and optimizing the manufacturing process. Temporal-signal-processing techniques, such as Markov transition fields (MTFs), are utilized to transform time series data into images, enabling the identification of patterns and anomalies. synamic time warping (DTW) aligns time series data, accommodating variations in speed or timing across different rolling processes. K-medoids clustering identifies representative points, characterizing distinct phases of the rolling process. The results not only demonstrate the effectiveness of this framework in monitoring the rolling process but also lay the foundation for the practical application of these methodologies. This allows operators to work with a simpler characterization source, facilitating a more straightforward interpretation of the manufacturing process.Publication Open Access Caracterización magneto-óptica de películas delgadas Co100xFex(2022) Hualde Osorio, Andrea; Vergara Platero, José; Favieres Ruiz, Cristina; Escuela Técnica Superior de Ingeniería Industrial, Informática y de Telecomunicación; Telekomunikazio eta Industria Ingeniarien Goi Mailako Eskola Teknikoa; Industria, Informatika eta Telekomunikazio Ingeniaritzako Goi Mailako Eskola TeknikoaSe caracterizaron películas delgadas de Co-Fe, fabricadas por deposición por láser pulsado en el Laboratorio de Magnetismo de la Universidad Pública de Navarra, mediante el Efecto Kerr Transversal Magneto-Óptico MOKE. Se modificó controladamente la composición de las mismas Co100-xFex. y se realizó un estudio de la estructura mediante difracción de rayos-X. Mediante la caracterización estructural se observa que las películas delgadas estudiadas Co100-xFex exhiben una estructura amorfa-nanocristalina. La muestra de composición Co35Fe65 es la que presenta mayor imanación espontánea. Las películas delgadas Co-Fe presentan campos coercitivos del orden de 10-4 T que aumentan con el contenido en Fe. Se observan pequeños campos de anisotropía, del orden de 10-4 T, al imanar en el plano de las películas, valores que aumentan ligeramente con el contenido de Co en las muestras.Publication Open Access Fabricación de películas delgadas de compuestos Co(100-x)-Cux(x=0, 5, 10, 20, 30), caracterización estructural y magnética, y análisis de su anisotropía magnética(2017) Lumbreras Ederra, Fermín; Vergara Platero, José; Favieres Ruiz, Cristina; Escuela Técnica Superior de Ingenieros Industriales y de Telecomunicación; Telekomunikazio eta Industria Ingeniarien Goi Mailako Eskola TeknikoaPara la elaboración de este Trabajo de Fin de Grado, se han fabricado películas delgadas, de espesor comprendido entre ≈30 y ≈100 nm, por deposición con láser pulsado, PLD. La variación de la composición se ha logrado por medio de la utilización de blancos, sobre los que incide el láser, compuestos de Co y Cu, consiguiendo así la generación de plasma mixto de dos elementos. La caracterización estructural se ha realizado por medio de difracción de rayos X, en el modo de incidencia rasante, y la caracterización magnética utilizando el efecto Kerr transversal magnetoóptico, MOKE, y la medida mediante magnetómetro de muestra vibrante, VSM. Se ha prestado especial atención a la medida y seguimiento de su anisotropía magnética, inducida mediante y durante el proceso de obtención.Publication Embargo Fabricación de películas delgadas de Fe-V constituidas por nano-láminas orientadas y estudio de sus propiedades de ansotropía magnética, óptica y eléctrica(2023) Troncoso Sánchez, Alejandro; Favieres Ruiz, Cristina; Vergara Platero, José; Escuela Técnica Superior de Ingeniería Industrial, Informática y de Telecomunicación; Industria, Informatika eta Telekomunikazio Ingeniaritzako Goi Mailako Eskola TeknikoaEn este trabajo se han fabricado, por deposición por láser pulsado (PLD), películas delgadas de Fe–Fe y de Fe–V con distintas composiciones de V, constituidas por nano-láminas orientadas debido a la deposición oblicua de plasma, conocidas como películas delgadas con crecimiento oblicuo de simetría cilíndrica (CSOG). Se ha realizado la caracterización estructural de las películas delgadas mediante la técnica de difracción de rayos-X. Además, se ha llevado a cabo la caracterización magnética mediante el efecto Kerr transversal magnetoóptico (MOKE) y magnetometría de muestra vibrante (VSM), lo que ha permitido determinar la anisotropía magnética de las películas CSOG. Se ha estudiado la dependencia angular de la resistencia eléctrica para determinar la anisotropía eléctrica de las películas CSOG. Finalmente se ha estudiado la dependencia angular de la reflexión óptica para determinar la anisotropía óptica de las películas CSOG.Publication Embargo Fabricación de películas delgadas de MnBi magnéticamente duras: caracterización y estudio de sus propiedades magnéticas y de transporte eléctrico(2023) Suescun Santamaría, Alain; Vergara Platero, José; Favieres Ruiz, Cristina; Escuela Técnica Superior de Ingeniería Industrial, Informática y de Telecomunicación; Industria, Informatika eta Telekomunikazio Ingeniaritzako Goi Mailako Eskola TeknikoaEn este trabajo, se fabricaron y caracterizaron, estructural y magnéticamente, películas delgadas de Bi/Mn, con espesores comprendidos entre los 200 y los 300 nm, a las que se les sometió a distintos tratamientos térmicos para conseguir la fase α-MnBi, con propiedades ferromagnéticas duras. La formación de la fase se siguió mediante medidas de la resistencia con la temperatura de calentamiento (hasta 450 ºC), que permitieron establecer las condiciones óptimas de tratamiento térmico para la consecución de la fase magnética dura. La caracterización estructural se realizó mediante difracción de rayos X (XRD). La caracterización de las propiedades magnéticas de la fase obtenida se realizó mediante Magnetometría de Muestra Vibrante (VSM).Publication Open Access Generating and measuring the anisotropic elastic behaviour of Co thin films with oriented surface nano-strings on micro-cantilevers(Springer, 2011) Madurga Pérez, Vicente; Vergara Platero, José; Favieres Ruiz, Cristina; Física; FisikaIn this research, the elastic behaviour of two Co thin films simultaneously deposited in an off-normal angle method was studied. Towards this end, two Si micro-cantilevers were simultaneously coated using pulsed laser deposition at an oblique angle, creating a Co nano-string surface morphology with a predetermined orientation. The selected position of each micro-cantilever during the coating process created longitudinal or transverse nano-strings. The anisotropic elastic behaviour of these Co films was determined by measuring the changes that took place in the resonant frequency of each micro-cantilever after this process of creating differently oriented plasma coatings had been completed. This differential procedure allowed us to determine the difference between the Young's modulus of the different films based on the different direction of the nano-strings. This difference was determined to be, at least, the 20% of the Young's modulus of the bulk Co.Publication Open Access Generation of highly anisotropic physical properties in ferromagnetic thin films controlled by their differently oriented nano-sheets(American Institute of Physics, 2024) Favieres Ruiz, Cristina; Vergara Platero, José; Magén, César; Ibarra, Manuel Ricardo; Madurga Pérez, Vicente; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2We fabricated ferromagnetic nano-crystalline thin films of Co, Fe, Co–Fe and Co-rich and Fe-rich, Co–MT and Fe–MT (MT = transition metal), constituted by nano-sheets with a controlled slant. Visualization of these nano-sheets by Scanning Tunneling Microscopy and HighResolution Transmission Electron Microscopy (HRTEM) showed typically tilt angles ≈56○ with respect to the substrate plane, and nano-sheets ≈3.0–4.0 nm thick, ≈30–100 nm wide, and ≈200–300 nm long, with an inter-sheet distance of ≈0.9–1.2 nm, depending on their constitutive elements. Induced by this nano-morphology, these films exhibited large uniaxial magnetic anisotropy in the plane, the easy direction of magnetization being parallel to the longitudinal direction of the nano-sheets. In the as-grown films, typical values of the anisotropy field were between Hk ≈ 48 and 110 kA/m depending on composition. The changes in the nano-morphology caused by thermal treatments, and hence in the anisotropic properties, were also visualized by HRTEM, including chemical analysis at the nano-scale. Some films retained their nano-sheet morphology and increased their anisotropies by up to three times after being heated to at least 500 ○C: for example, the thermal treatments produced crystallization processes and the growth of CoV and CoFe magnetic phases, maintaining the nano-sheet morphology. In contrast, other annealed films, Co, Fe, CoZn, CoCu. . . lost their nano-sheet morphology and hence their anisotropies. This work opens a path of study for these new magnetically anisotropic materials, particularly with respect to the nano-morphological and structural changes related to the increase in magnetic anisotropy.Publication Open Access High magnetic, transport, and optical uniaxial anisotropis generated by controlled directionally grown nano-sheets in Fe thin films(American Institute of Physics, 2023) Favieres Ruiz, Cristina; Vergara Platero, José; Madurga Pérez, Vicente; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2Fe films with thicknesses between 17 and 95 nm were grown with a nano-sheet morphology, which enabled their high uniaxial magnetic, transport, and optical in-plane anisotropies. The top edge of the nano-sheets was directly visualized as nano-string-like structures of approximately 12.5–14 nm width and 100–300 nm length. The hysteresis loops showed a clear easy direction of magnetization in the longitudinal direction of the nano-sheets, whereas the hard direction loops were anhysteretic, with no remanence and zero coercive field. The anisotropy field exhibited values between 70 and 111 kA/m depending on the thickness of the films, with the maximum value corresponding to a 34 nm thick sample. The resistance of the films was also found to be highly anisotropic. The ratio (R⊥–R||)/R|| was ≈86%, with R|| and R⊥ being the resistances in the parallel and perpendicular directions of the nano-sheets, respectively. Likewise, the reflectivity of the samples behaved anisotropically; the ratio (IReflmax–IReflmin)/IReflmax of the intensity of reflected light by the films reached up to 61% for 34 nm thick samples, achieving the maximum value, IReflmax, when the plane of the incident light coincided with the direction of the nano-sheets and the minimum, IReflmin, when this plane was perpendicular to the direction of the nano-sheets. The origin of these anisotropic behaviors was established. These anisotropic films with high magnetization and high uniaxial anisotropies at the nanoscale can be useful for microelectronics applications, for devices such as magnetic sensors and transducers, or for ultrahigh frequency inductorsPublication Open Access Influence of bi content on the temperature of the formation of the hard magnetic MnBi phase: simultaneous irreversible drop of resistance(MDPI, 2022) Vergara Platero, José; Favieres Ruiz, Cristina; Madurga Pérez, Vicente; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; CienciasPulsed laser-deposited (PLD) MnBi films were fabricated by alternating deposition of Mn and Bi layers. In order to obtain the ferromagnetic MnBi phase, heat treatments were performed on the samples. Simultaneously, the resistance of the samples was monitored as a function of the temperature. Thus, on increasing the temperature, a steep decrease in the resistance of the films was observed, simultaneous to the onset of the formation of the MnBi phase. At room-temperature, these annealed samples showed a ferromagnetic behavior, as well as the presence of the characteristic LT-MnBi phase diffraction peaks in the X-ray diffraction patterns. The temperature of the generation of the MnBi phase depended on the relative concentration of Mn and Bi in the different samples: on increasing the Bi atomic concentration, the temperature of the generation of the MnBi phase decreased.Publication Open Access Magnetic anisotropy in isotropic and nanopatterned strongly exchange-coupled nanolayers(Springer, 2012) Vergara Platero, José; Favieres Ruiz, Cristina; Madurga Pérez, Vicente; Física; FisikaIn this study, the fabrication of magnetic multilayers with a controlled value of the in-plane uniaxial magnetic anisotropy field in the range of 12 to 72 kA/m was achieved. This fabrication was accomplished by the deposition of bilayers consisting of an obliquely deposited (54A degrees) 8-nm-thick anisotropic Co layer and a second isotropic Co layer that was deposited at a normal incidence over the first layer. By changing the thickness value of this second Co layer (X) by modifying the deposition time, the value of the anisotropy field of the sample could be controlled. For each sample, the thickness of each bilayer did not exceed the value of the exchange correlation length calculated for these Co bilayers. To increase the volume of the magnetic films without further modification of their magnetic properties, a Ta spacer layer was deposited between successive Co bilayers at 54A degrees to prevent direct exchange coupling between consecutive Co bilayers. This step was accomplished through the deposition of multilayered films consisting of several (Co8 nm-54A degrees/Co (X nm-0A degrees)/Ta6 nm-54A degrees) trilayers.Publication Open Access Magnetic domain configurations of pulsed laser deposited MnBi hard magnetic films(Elsevier, 2022) Madurga Pérez, Vicente; Favieres Ruiz, Cristina; Vergara Platero, José; Institute for Advanced Materials and Mathematics - INAMAT2; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaHard magnetic MnBi films were obtained by appropriate heat treatments of pulsed laser deposited (PLD) (Bi/Mn) films. X-ray diffraction patterns indicated a slight texture of MnBi crystallites and magnetometry measurements showed a slight preferential growth of the crystallites with their c-axis perpendicular to the film plane. Magnetic force microscopy (MFM) measurements displayed the presence of magnetic domains, whose size was in the micrometer range, and which were correlated to the MnBi grains observed in the sample. The addition of extra Mn layers did not modify significantly the previous structural and magnetic results. Nevertheless, the size of the magnetic domains increased to a few microns. However, on adding extra Bi layers, upon annealing, the MnBi grains grew with their c-axes perpendicular to the film plane. A perpendicular to the film magnetic anisotropy was deduced from the hysteresis loops, where an increase in the remanence of the magnetization was measured when the magnetic field was applied perpendicular to the film plane. In these samples, by measuring the magnetic domain configuration of the samples by MFM, we observed that the size of the magnetic domains exceeded the dimensions of the grains. This change in the magnetic structure of the films was assumed to be due to the coupling of the magnetization in the neighboring grains, and it was responsible for the decrease of the coercivity in the Bi rich samples.Publication Open Access Quest for amorphous superconductors of Bi-Sb alloys by irradiation with swift heavy ions(AIP Publishing, 2025-03-17) Andrino-Gómez, Alberto; Tabares, Gema; Moratalla, Manuel ; Redondo-Cubero, Andrés; Madurga Pérez, Vicente; Favieres Ruiz, Cristina; Vergara Platero, José; García-López, Gastón; Gordillo, Nuria; Ramos, Miguel Ángel ; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2Crystalline Bi100−xSbx alloys are known as the first discovered topological insulators, as well as for their promising thermoelectric properties, while their amorphous counterparts exhibit superconductivity (Tc > 6 K). However, their strong tendency to crystallize has hindered both the study and practical applications of amorphous Bi and Bi–Sb alloys. To explore the possibility of obtaining amorphous superconducting phases and enhancing thermoelectric properties, we investigated ion-beam irradiation as a method to induce amorphization in Bi100−xSbx alloys. We report irradiation experiments on pure Bi and Bi100−xSbx using bismuth and iodine ions (tens of MeV), generating an estimated vacancy damage of 40%–80%. Structural characterization and electrical resistivity measurements (2–300 K) revealed that, while amorphization and superconductivity were not achieved, melt-spun samples exhibited an order of magnitude higher conductivity than thermally evaporated ones. Moreover, ion-induced disorder further improved electrical conductivity, particularly in Bi90Sb10, highlighting its potential for thermoelectric applications.Publication Open Access Structurally oriented nano-sheets in Co thin films: changing their anisotropic physical properties by thermally-induced relaxation(MDPI, 2017) Vergara Platero, José; Favieres Ruiz, Cristina; Magén, César; Teresa, José María de; Ibarra, Manuel Ricardo; Madurga Pérez, Vicente; Fisika; Institute for Advanced Materials and Mathematics - INAMAT2; FísicaWe show how nanocrystalline Co films formed by separated oblique nano-sheets display anisotropy in their resistivity, magnetization process, surface nano-morphology and optical transmission. After performing a heat treatment at 270 °C, these anisotropies decrease. This loss has been monitored measuring the resistivity as a function of temperature. The resistivity measured parallel to the direction of the nano-sheets has been constant up to 270 °C, but it decreases when measured perpendicular to the nano-sheets. This suggests the existence of a structural relaxation, which produces the change of the Co nano-sheets during annealing. The changes in the nano-morphology and the local chemical composition of the films at the nanoscale after heating above 270 °C have been analysed by scanning transmission electron microscopy (STEM). Thus, an approach and coalescence of the nano-sheets have been directly visualized. The spectrum of activation energies of this structural relaxation has indicated that the coalescence of the nano-sheets has taken place between 1.2 and 1.7 eV. In addition, an increase in the size of the nano-crystals has occurred in the samples annealed at 400 °C. This study may be relevant for the application in devices working, for example, in the GHz range and to achieve the retention of the anisotropy of these films at higher temperatures.Publication Open Access Surface roughness influence on Néel-, crosstie, and Bloch-type charged zigzag magnetic domain walls in nanostructured Fe films(MDPI, 2020) Favieres Ruiz, Cristina; Vergara Platero, José; Madurga Pérez, Vicente; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; Ciencias; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, PRO-UPNA18 (6105)Charged magnetic domain walls have been visualized in soft magnetic nanostructured Fe thin films under both static and dynamic conditions. A transition in the core of these zigzagged magnetic walls from Néel-type to Bloch-type through the formation of crosstie walls has been observed. This transition in charged zigzagged walls was not previously shown experimentally in Fe thin films. For film thicknesses t < 30 nm, Néel-type cores are present, while at t ≈ 33 nm, walls with crosstie cores are observed. At t > 60 nm, Bloch-type cores are observed. Along with the visualization of these critical parameters, the dependence on the film thickness of the characteristic angle and length of the segments of the zigzagged walls has been observed and analyzed. After measuring the bistable magneto-optical behavior, the values of the wall nucleation magnetic field and the surface roughness of the films, an energetic fit to these nucleation values is presented.Publication Open Access Tailoring magnetic and transport anisotropies in Co100−x –Cux thin films through obliquely grown nano-sheets(MDPI, 2022) Favieres Ruiz, Cristina; Vergara Platero, José; Madurga Pérez, Vicente; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; Ciencias; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaThe magnetic and transport properties of pulsed laser-deposited Co100−x –Cux thin films were tailored through their nano-morphology and composition by controlling for the deposition geometry, namely normal or oblique deposition, and their Cu content. All films were composed of an amorphous Co matrix and a textured growth of Cu nanocrystals, whose presence and size d increased as x increased. For x = 50, all films were superparamagnetic, regardless of deposition geometry. The normally deposited films showed no in-plane magnetic anisotropy. On the contrary, controllable in-plane uniaxial magnetic anisotropy in both direction and magnitude was generated in the obliquely deposited films. The magnetic anisotropy field Hk remained constant for x = 0, 5 and 10, Hk ≈ 35 kAm−1, and decreased to 28 and 26 kAm−1 for x = 20 and 30, respectively. This anisotropy had a magnetostatic origin due to a tilted nano-sheet morphology. In the normally deposited films, the coercive field Hc increased when x increased, from 200 (x = 0) to 1100 Am−1 (x = 30). In contrast, in obliquely deposited films, Hc decreased from 1500 (x = 0) to 100 Am−1 (x = 30) as x increased. Activation energy spectra corresponding to structural relaxation phenomena in obliquely deposited films were obtained from transport property measurements. They revealed two peaks, which also depended on their nano-morphology and composition.Publication Open Access Thermal hysteresis in the structural, magnetic and transport properties of hard magnetic MnBi films(Elsevier, 2024-10-15) Vergara Platero, José; Favieres Ruiz, Cristina; Madurga Pérez, Vicente; Ciencias; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaIn this work, the magnetic and transport properties associated with structural changes in MnBi hard magnetic films, with different Bi concentrations, were detailed. Two particular temperature regimes were studied. In the first place, at temperatures close to and below 260 °C (melting temperature of Bi in the samples) the resistance of the MnBi films underwent strong changes, showing thermal hysteresis, and depending on the amount of Bi in the samples. Thus, these resistance changes were attributed to the presence of unalloyed Bi in the samples. The maximum value of the relative change of resistance, ΔRI/R(T2) (where ΔRI=R(T1)-R(T2) being T1 and T2 the temperatures just immediately below and above the structural transition) was around 180 % for the sample with the highest Bi concentration. Second, at temperatures above 260 °C, both the magnetic moment and the resistance of the samples also showed significant changes around the transition from the Low Temperature (α-MnBi) to the High Temperature (β-MnBi) phase. These changes, which were attributed to this structural transition, also presented thermal hysteresis and also depended on the Bi concentration of the samples. However, contrary to the previous situation, the samples with the lowest amount of unalloyed Bi, and consequently with the highest value of the MnBi volume fraction presented a maximum value of the ΔRII/R(T4) ratio, (where ΔRII=R(T3)-R(T4) being T3 and T4 the temperatures immediately above and below the structural transition from the β to the α MnBi phase) this magnitude reaching a maximum value of 25 % for the sample with the lowest Bi content.Publication Open Access Three-dimensional finite element modelling of sheet metal forming for the manufacture of pipe components: symmetry considerations(MDPI, 2022) Bhujangrao, Trunal; Veiga Suárez, Fernando; Penalva Oscoz, Mariluz; Costas, Adriana; Favieres Ruiz, Cristina; Ingeniería; IngeniaritzaThe manufacture of parts by metal forming is a widespread technique in sectors such as oil and gas and automotives. It is therefore important to make a research effort to know the correct set of parameters that allow the manufacture of correct parts. This paper presents a process analysis by means of the finite element model. The use case presented in this paper is that of a 3-m diameter pipe component with a thickness of 22 mm. In this type of application, poor selection of process conditions can result in parts that are out of tolerance, both in dimensions and shape. A 3D finite element model is made, and the symmetry of the tube section generated in 2D is analysed. As a novelty, an analysis of the process correction as a function of the symmetrical deformation of the material in this case in the form of a pipe is carried out. The results show a correct fitting of the model and give guidelines for manufacturing.Publication Open Access Vanadium trapped by oblique nano-sheets to preserve the anisotropy in Co-V thin films at high temperature(Elsevier, 2022) Favieres Ruiz, Cristina; Vergara Platero, José; Magén, César; Ibarra, Manuel Ricardo; Madurga Pérez, Vicente; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; Ciencias; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaIn this study, oriented nano-sheets generated during the growth of cobalt-rich Co–V and Co–Zn thin films induced a large anisotropy in the magnetic and transport properties. The regular nano-sheets were tilted 52–54 deg. with respect to the substrate plane, ≈ 3.0–4.0 nm thick, ≈ 30–100 nm wide, and ≈ 200–300 nm long, with an inter-sheet distance of ≈ 0.9–1.2 nm. In spite of the different microstructures of the two kinds of samples where the Co–V films were amorphous, whereas the Co–Zn films showed a growth of Zn nanocrystals, the oblique nano-sheet morphology conferred noticeable shape anisotropy to both specimens. This anisotropy resulted in an in-plane uniaxial magnetic anisotropy. The changes in the nano-morphology caused by thermal treatments, and hence in their anisotropic properties, were studied. While the Co–V samples retained or increased their magnetic and transport anisotropies, this anisotropic behavior vanished for the annealed Co–Zn films. High resolution transmission electron microscopy, HRTEM, including chemical analysis at the nano-scale, and the dependence of the anisotropic resistance on temperature allowed to establish the nature and the activation energy spectra of the atomic relaxation processes during heating. These processes displayed a single peak at 1.63 eV for the Co–V and two peaks at 1.67 and 2.0 eV for the Co–Zn. These spectra and their singularities were associated to the changes induced in the nano-morphology of the films by thermal treatments. The Co–V films retained their nano-sheet morphology almost up to 500 ºC; the Co–Zn films lost their nano-sheets at 290 ºC. The thermal stability exhibited by the Co–V films makes them useful for applications in ultra high frequency, optical, magnetostrictive and magnetoelectric devices.