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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 5: Thin oxides and oxide layers (joint session DS/KFM)

KFM 5.1: Talk

Monday, March 18, 2024, 09:30–09:45, A 053

Non-collinear spin texture in thin rare-earth ion doped nickel ferrite films — •Anupam K. Singh1, Katayoon Mohseni1, Malleshwara R. Tangi1, Verena Ney2, Andreas Ney2, Arthur Ernst2, Yicheng Guan1, Manuel Valvidares3, P. Gargiani3, Ilya Kostanvoskiy1, Holger L. Meyerheim1, and Stuart S. P. Parkin11Max Planck Institute of Microstructure Physics, Weinberg 2, 06120, Halle (Saale), Germany — 2Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria — 3ALBA Synchrotron, E-08290 Cerdanyola del Valle`s, Barcelona, Spain

Ferrites are abundantly used as magnetic materials, but thus far, the detailed magnetic structure in ultra-thin films has escaped clear-cut characterization. The recent observation of rare-earth-induced DMI in low-dissipation insulating oxides calls for a deeper insight into their spin texture [1]. We have studied the atomic and magnetic structure of 5 to 40 nm thick Dy-doped (5%) Zn/Al-substituted nickel ferrite (Ni0.65Zn0.35Al0.8Fe1.2O4) films prepared by magnetron sputtering. Characterization by RBS, XRD, EXAFS and XMCD experiments at the Fe-K, L2,3 and the Dy-L2,3, M4,5 edges establish the formation of a tetragonally distorted spinel structure where Dy3+ ions occupy octahedral sites with a redistribution of the Fe2+ and Fe3+ cations. Temperature-dependent SQUID, XMCD and MOKE experiments indicate a spin-reorientation transition from in-plane easy axis below 200 K, thereby showing a non-monotonic behavior of the M(T) curve which is interpreted as due to the formation of a non-collinear spin structure. [1] L. Caretta, et al., Nat. Comm. 11, 1090 (2020).

Keywords: Non-collinear; Spinel; Nickel ferrite; x-ray absorption spectroscopy; Magneto-optic Kerr effect

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