Mn2RuxGa (MRG) is a half-metallic compensated ferrimagnet crystallising in a cubic inverse Heusler structure (XA) with a substrate-induced biaxial strain of about 1% leading to perpendicular magnetic anisotropy of the net moment. The Mn atoms occupy two different crystallographic sites, Wyckoff positions 4a and 4c. [1] From band structure calculations we find that the states originating from the Mn4c sites dominate the transport. Anomalous Hall effect (AHE) resistance is proportional to the z-component of the magnetisation of the Mn4c sublattice. [2] The AHE measurements show loops with high remanence and only one magnetic phase, with coercivity diverging close to compensation. SQUID magnetometry measures the net moment, i.e. the sum of Mn4a and Mn4c sublattice moments. SQUID-measured magnetisation, in the same geometry as AHE, exhibits a combination of an apparent soft magnetic response in addition to a component with the coercivity observed by AHE. We infer that the net magnetic moment is canted due to non-collinearity of the sublattice moments. Our DFT calculations suggest that the non-collinearity may be due to competing exchange on the Mn4c sites as bulk antisymmetric exchange averages to zero in the -43m point group [3]. The Mn4c sublattice and net magnetisations differ by an order of magnitude, so a small canting of the Mn4c moment can result in a large canting of the net moment. X-ray magnetic circular dichroism measurements were performed to map sublattice magnetisations in the z-x plane. Both sublattices can be distinguished by L-edge absorption due to charge-transfer separation of the Mn absorption edges at the two sites by ≈ 1 eV. [2] Analysis of the mz-mx moments shows that they are indeed non-collinear (Fig.1). From balancing of torques, anisotropy fields at the Mn4a and Mn4c sublattices were found to be easy-plane -1.8 T and easy-axis 3 T, respectively (Fig.2.).References: [1] H. Kurt, K. Rode, P. Stamenov, et al., “Cubic Mn2Ga thin films: crossing the spin gap with ruthenium”, Phys. Rev. Lett., 112, p. 27201, 2014. [2] D. Betto, N. Thiyagarajah, Y.-C. Lau, et al., “Site-specific magnetism of half-metallic Mn2RuxGa thin films determined by x-ray absorption spectroscopy”, Phys. Rev. B, 91, p. 094410, 2015. [3] O. Meshcheriakova, S. Chadov, A.K. Nayak, et al. "Large Noncollinearity and Spin Reorientation in the Novel Mn2RhSn Heusler Magnet", Phys. Rev. Lett. 113, p. 087203, 2014.

Investigation of non-collinearity in Mn2RuxGa compensated ferrimagnetic half-metallic thin films

E1: Half-Metallic Materials

technical paper

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Katarzyna Siewierska

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Investigation of non-collinearity in Mn2RuxGa compensated ferrimagnetic half-metallic thin films

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