Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal

doi:10.1007/s11467-023-1343-x

Frontiers of Physics

2024, Vol. 19

Issue (2): 23203 https://doi.org/10.1007/s11467-023-1343-x

本期目录

Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal

Wanting Yang^1,², Shuang Zhu¹, Xiong Luo³, Xiaoxuan Ma^1,², Chenfei Shi¹, Huan Song¹, Zhiqiang Sun¹, Yefei Guo¹, Yuriy Dedkov¹, Baojuan Kang^1,², Jin-Ke Bao¹, Shixun Cao^1,^2,⁴(

)

¹. Department of Physics, Shanghai University, Shanghai 200444, China
². Materials Genome Institute and International Center for Quantum and Molecular Structures, Shanghai University, Shanghai 200444, China
³. School of Physics, Southeast University, Nanjing 211189, China
⁴. Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, China

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Abstract：

Rare-earth orthoferrite REFeO₃ (where RE is a rare-earth ion) is gaining interest. We created a high-entropy orthoferrite (Tm_0.2Nd_0.2Dy_0.2Y_0.2Yb_0.2)FeO₃ (HEOR) by doping five RE ions in equimolar ratios and grew the single crystal by optical floating zone method. It strongly tends to form a single-phase structure stabilized by high configurational entropy. In the low-temperature region (11.6‒ 14.4 K), the spin reorientation transition (SRT) of Γ₂ (F_x, C_y, G_z)‒Γ₂₄‒Γ₄ (G_x, A_y, F_z) occurs. The weak ferromagnetic (FM) moment, which comes from the Fe sublattices distortion, rotates from the a- to c-axis. The two-step dynamic processes (Γ₂‒Γ₂₄‒Γ₄) are identified by AC susceptibility measurements. SRT in HEOR can be tuned in the range of 50‒60000 Oe, which is an order of magnitude larger than that of orthoferrites in the peer system, making it a candidate for high-field spin sensing. Typical spin-switching (SSW) and continuous spin-switching (CSSW) effects occur under low magnetic fields due to the strong interactions between RE‒Fe sublattices. The CSSW effect is tunable between 20‒50 Oe, and hence, HEOR potentially can be applied to spin modulation devices. Furthermore, because of the strong anisotropy of magnetic entropy change ( $− Δ S m$ ) and refrigeration capacity (RC) based on its high configurational entropy, HEOR is expected to provide a novel approach for refrigeration by altering the orientations of the crystallographic axes (anisotropic configurational entropy).

Key words： high-entropy oxide rare-earth orthoferrite spin reorientation transition spin switching magnetocaloric effect

收稿日期: 2023-06-06 出版日期: 2023-10-07

Corresponding Author(s): Shixun Cao

引用本文:

. [J]. Frontiers of Physics, 2024, 19(2): 23203.
Wanting Yang, Shuang Zhu, Xiong Luo, Xiaoxuan Ma, Chenfei Shi, Huan Song, Zhiqiang Sun, Yefei Guo, Yuriy Dedkov, Baojuan Kang, Jin-Ke Bao, Shixun Cao. Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal. Front. Phys. , 2024, 19(2): 23203.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-023-1343-x
https://academic.hep.com.cn/fop/CN/Y2024/V19/I2/23203

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