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Local and medium range order influence on the magnetic behavior of sputtered ga-rich fega thin films

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Muñoz Noval, Álvaro and Salas Colera, E. and Ranchal Sánchez, Rocío (2019) Local and medium range order influence on the magnetic behavior of sputtered ga-rich fega thin films. Journal of physical chemistry C, 123 (20). pp. 13131-13135. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/acs.jpcc.9b01889


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Abstract

We have investigated the influence of the growth power on the structural properties of Fe_100_(-x)Ga_x (x ca. 29) films sputtered in the ballistic regime in the oblique incidence. By means of different structural characterizations, mainly X-ray diffraction and X-ray absorption spectroscopy, we have reached a deeper understanding about the influence of the local and medium range order on the magnetic behavior of Ga-rich FeGa thin films. On the one hand, the increase of the growth power reduces the crystallite size (medium order) that promotes the decrease of the coercive field of the layers. On the other hand, the growth power also determines the local order as it controls the formation of the A2, B2, and D0_3 structural phases. The increase of the uniaxial in-plane magnetic anisotropy with growth power has been correlated with the enhancement of both Ga pairs and a tetragonal distortion. The results presented in this work give more evidence about the magnetic anisotropy sources in Ga-rich FeGa alloys, and therefore, it helps to understand how to achieve a better control of the magnetic properties in this family of alloys.


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©2019 American Chemical Society
This work has been financially supported through project MAT2015-66888-C3-3-R (MINECO/FEDER) and RTI2018-097895-B-C43 of the Spanish Ministry of Economy and Competitiveness and through PR26/16-3B-2 of Santander and Universidad Complutense de Madrid. We thank "CAI Difraccion de rayos-X" of UCM for the X-ray diffractometry measurements and the "Instituto de Sistemas Optoelectronicos y Microtecnologia" (ISOM) for using its facilities. We also want to thank BM25-Spline, the Spanish CRG at ESRF for providing beamtime.

Uncontrolled Keywords:Deposition; Anisotropy; Surface; Atoms
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:56055
Deposited On:01 Jul 2019 18:00
Last Modified:09 Jul 2019 07:34

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