Unveiling the different physical origins of magnetic anisotropy and magnetoelasticity in ga-rich fega thin films



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Bartolomé, Pablo and Begué, A and Muñoz Noval, Álvaro and Ciria, M. and Ranchal Sánchez, Rocío (2020) Unveiling the different physical origins of magnetic anisotropy and magnetoelasticity in ga-rich fega thin films. Journal of physical chemistry C, 124 (8). pp. 4717-4722. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/acs.jpcc.9b10879


The aim of this work is to clarify how in-plane magnetic anisotropy and magnetoelasticity depend on the thickness of Ga-rich FeGa layers. Samples with an Fe72Ga28 composition were grown by sputtering in the ballistic regime in oblique incidence. Although for these growth conditions uniaxial magnetic anisotropy could be expected, in-plane anisotropy is only present when the sample thickness is above 100 nm. By means of differential X-ray absorption spectroscopy, we have determined the influence of both Ga pairs and tetragonal cell distortion on the evolution of the magnetic anisotropy with the increase of FeGa thickness. On the other hand, we have used the cantilever beam technique with capacitive detection to also determine the evolution of the magnetoelastic parameters with the thickness increase. In this case, experimental results can be understood considering the grain distribution. Therefore, the different physical origins for anisotropy and magnetoelasticity open up the possibility to independently tune these two characteristics in Ga-rich FeGa films.

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©2020 American Chemical Society
We thank ALBA synchrotron for providing time and technical assistance at the BL22 beamline, and Instituto of Sistemas OptoelectrOnicos y Microtecnologia (ISOM) for using some of its facilities. This work has been financially supported through the projects MAT2015-66888-C3-3-R and MAT2015-66726-R (MINECO/FEDER) of the Spanish Ministry of Economy and Competitiveness, RTI2018-097895-B-C43 of the Spanish Ministry of Science, Innovation, and Universities, and Gobierno de Aragon (Grant E10 -17D) and Fondo Social Europeo. A.M.-N. is thankful for the contract from Universidad Complutense and Comunidad de Madrid "Atraccion de Talento" program 2018-T1/IND-10360, and A.B. thanks MINECO for the Ph.D. grant BES-2016-076482.

Uncontrolled Keywords:Magnetostriction; Stress; Chemistry, Physical; Nanoscience; Nanotechnology; Materials Science; Multidisciplinary
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:59674
Deposited On:21 Mar 2020 17:19
Last Modified:27 Feb 2021 23:00

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