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Tailoring-compensated ferrimagnetic state and anomalous Hall effect in quaternary Mn-Ru-V-Ga Heusler compounds |
| Jin-Jing Liang(梁瑾静)1,2, Xue-Kui Xi(郗学奎)1, Wen-Hong Wang(王文洪)3, and Yong-Chang Lau(刘永昌)1,2,† |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Tiangong University, Tianjin 300387, China |
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Abstract Cubic Mn$_{2}$Ru$_{x}$Ga Heusler compound is a typical example of compensated ferrimagnet with attractive potential for high-density, ultrafast, and low-power spintronic applications. In the form of epitaxial thin films, Mn$_{2}$Ru$_{x}$Ga exhibits high spin polarization and high tunability of compensation temperature by freely changing the Ru content $x$ in a broad range ($0.3 < x < 1.0$). Herein Mn-Ru-Ga-based polycrystalline bulk buttons prepared by arc melting are systematically studied and it is found that in equilibrium bulk form, the cubic structure is unstable when $x < 0.75$. To overcome this limitation, Mn-Ru-Ga is alloyed with a fourth element V. By adjusting the content of V in the Mn$_{2}$Ru$_{0.75}$V$_{y}$Ga and Mn$_{2.25-y}$Ru$_{0.75}$V$_{y}$Ga quaternary systems, the magnetic compensation temperature is tuned. Compensation is achieved near 300 K which is confirmed by both the magnetic measurement and anomalous Hall effect measurement. The analyses of the anomalous Hall effect scaling in quaternary Mn-Ru-V-Ga alloy reveal the dominant role of skew scattering, notably that contributed caused by the thermally excited phonons, in contrast to the dominant intrinsic mechanism found in many other 3d ferromagnets and Heusler compounds. It is further shown that the Ga antisites and V content can simultaneously control the residual resistivity ratio (RRR) as well as the relative contribution of phonon and defect to the anomalous Hall effect $a''/a'$ in Mn-Ru-V-Ga, resulting in a scaling relation $a''/a' \propto $ RRR$^{1.8}$.
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Received: 22 January 2024
Revised: 07 March 2024
Accepted manuscript online: 18 March 2024
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PACS:
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75.20.En
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(Metals and alloys)
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75.50.Gg
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(Ferrimagnetics)
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75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1402600), the National Natural Science Foundation of China (Grant No. 12274438), and the Beijing Natural Science Foundation, China (Grant No. Z230006). |
Corresponding Authors:
Yong-Chang Lau
E-mail: yongchang.lau@iphy.ac.cn
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Cite this article:
Jin-Jing Liang(梁瑾静), Xue-Kui Xi(郗学奎), Wen-Hong Wang(王文洪), and Yong-Chang Lau(刘永昌) Tailoring-compensated ferrimagnetic state and anomalous Hall effect in quaternary Mn-Ru-V-Ga Heusler compounds 2024 Chin. Phys. B 33 077504
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