Publication: Structurally oriented nano-sheets in Co thin films: changing their anisotropic physical properties by thermally-induced relaxation
| dc.contributor.author | Vergara Platero, José | |
| dc.contributor.author | Favieres Ruiz, Cristina | |
| dc.contributor.author | Magén, César | |
| dc.contributor.author | Teresa, José María de | |
| dc.contributor.author | Ibarra, Manuel Ricardo | |
| dc.contributor.author | Madurga Pérez, Vicente | |
| dc.contributor.department | Fisika | eu |
| dc.contributor.department | Institute for Advanced Materials and Mathematics - INAMAT2 | en |
| dc.contributor.department | Física | es_ES |
| dc.date.accessioned | 2018-09-05T12:23:25Z | |
| dc.date.available | 2018-09-05T12:23:25Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | We 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. | en |
| dc.description.sponsorship | C.M., J.M.d.T. and M.R.I. acknowledge the financial support from the Spanish Ministerio de Economía y Competitividad in the project MAT2017-82970-C2-R. | en |
| dc.format.extent | 15 p. | |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.doi | 10.3390/ma10121390 | |
| dc.identifier.issn | 1996-1944 | |
| dc.identifier.uri | https://academica-e.unavarra.es/handle/2454/30519 | |
| dc.language.iso | eng | en |
| dc.publisher | MDPI | en |
| dc.relation.ispartof | Materials, 2017, 10, 1390 | en |
| dc.relation.projectID | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2017-82970-C2-1-R/ES/ | en |
| dc.relation.publisherversion | https://doi.org/10.3390/ma10121390 | |
| dc.rights | © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution. | en |
| dc.rights.accessRights | info:eu-repo/semantics/openAccess | |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | Nanocrystals | en |
| dc.subject | Anisotropy resistivity | en |
| dc.subject | Magnetic | en |
| dc.subject | Optic | en |
| dc.subject | Morphological | en |
| dc.subject | Nano-sheets | en |
| dc.subject | STEM-EELS | en |
| dc.subject | Structural relaxation | en |
| dc.subject | Activation energy | en |
| dc.subject | Laser deposition PLD | en |
| dc.title | Structurally oriented nano-sheets in Co thin films: changing their anisotropic physical properties by thermally-induced relaxation | en |
| dc.type | info:eu-repo/semantics/article | |
| dc.type.version | info:eu-repo/semantics/publishedVersion | en |
| dc.type.version | Versión publicada / Argitaratu den bertsioa | es |
| dspace.entity.type | Publication | |
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