Perpendicular and in-plane hole asymmetry in a strained NiFe 2 O 4 film.

Autor: Knut R; Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden., Malik RS; Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden., Kons C; Department of Physics, University of South Florida, Tampa, FL 33620, United States of America., Shoup JE; Department of Physics, University of South Florida, Tampa, FL 33620, United States of America., Radu F; Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany., Luo C; Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489, Berlin, Germany.; Institute of Experimental Physics of Functional Spin Systems, Technical University of Munich, James-Franck-Strasse 1, 85748 Garching b. München, Germany., Kvashnin YO; Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden., Gupta A; Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, AL 35487, United States of America., Karis O; Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden., Arena DA; Department of Physics, University of South Florida, Tampa, FL 33620, United States of America.
Jazyk: angličtina
Zdroj: Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2021 May 04; Vol. 33 (22). Date of Electronic Publication: 2021 May 04.
DOI: 10.1088/1361-648X/abf0c5
Abstrakt: Strained materials can exhibit drastically modified physical properties in comparison to their fully relaxed analogues. We report on the x-ray absorption spectra (XAS) and magnetic circular dichroism (XMCD) of a strained NiFe 2 O 4 inverse spinel film grown on a symmetry matched single crystal MgGa 2 O 4 substrate. The Ni XAS spectra exhibit a sizable difference in the white line intensity for measurements with the x-ray electric field parallel to the film plane (normal incidence) vs when the electric field is at an angle (off-normal). A considerable difference is also observed in the Fe L 2,3 XMCD spectrum. Modeling of the XAS and XMCD spectra indicate that the modified energy ordering of the cation 3 d states in the strained film leads to a preferential filling of 3 d states with out-of-plane character. In addition, the results point to the utility of x-ray spectroscopy in identifying orbital populations even with elliptically polarized x-rays.
(© 2021 IOP Publishing Ltd.)
Databáze: MEDLINE
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