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Vergara J, Favieres C, Magén C, et al. Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation. Materials (Basel). 2017;10(12)doi: 10.3390/ma10121390.
Vergara, J., Favieres, C., Magén, C., de Teresa, J. M., Ibarra, M. R., & Madurga, V. (2017). Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation. Materials (Basel, Switzerland), 10(12), . https://doi.org/10.3390/ma10121390
Vergara, José, et al. "Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation." Materials (Basel, Switzerland) vol. 10,12 (2017). doi: https://doi.org/10.3390/ma10121390
Vergara J, Favieres C, Magén C, de Teresa JM, Ibarra MR, Madurga V. Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation. Materials (Basel). 2017 Dec 05;10(12). doi: 10.3390/ma10121390. PMID: 29206155; PMCID: PMC5744325.
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Materials (Basel). 2017 Dec 05;10(12). doi: 10.3390/ma10121390.

Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation.

Materials (Basel, Switzerland)

José Vergara, Cristina Favieres, César Magén, José María de Teresa, Manuel Ricardo Ibarra, Vicente Madurga

Affiliations

  1. Laboratorio de Magnetismo, Departamento de Física, Universidad Pública de Navarra, 31006 Pamplona, Spain. [email protected].
  2. Instituto de Materiales Avanzados, Universidad Pública de Navarra, 31006 Pamplona, Spain. [email protected].
  3. Laboratorio de Magnetismo, Departamento de Física, Universidad Pública de Navarra, 31006 Pamplona, Spain. [email protected].
  4. Instituto de Materiales Avanzados, Universidad Pública de Navarra, 31006 Pamplona, Spain. [email protected].
  5. Instituto de Nanociencia de Aragón (INA) and Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain. [email protected].
  6. Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain. [email protected].
  7. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain. [email protected].
  8. Instituto de Nanociencia de Aragón (INA) and Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain. [email protected].
  9. Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain. [email protected].
  10. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain. [email protected].
  11. Instituto de Nanociencia de Aragón (INA) and Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain. [email protected].
  12. Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain. [email protected].
  13. Laboratorio de Magnetismo, Departamento de Física, Universidad Pública de Navarra, 31006 Pamplona, Spain. [email protected].
  14. Instituto de Materiales Avanzados, Universidad Pública de Navarra, 31006 Pamplona, Spain. [email protected].

PMID: 29206155 PMCID: PMC5744325 DOI: 10.3390/ma10121390

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.

Keywords: STEM-EELS; activation energy; anisotropy resistivity; laser deposition PLD; magnetic; morphological; nano-sheets; nanocrystals; optic; structural relaxation

Conflict of interest statement

The authors declare no conflict of interest.

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