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

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Frontiers of Physics Pub Date : 2023-12-11 DOI:10.1007/s11467-023-1343-x
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
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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 (Tm0.2Nd0.2Dy0.2Y0.2Yb0.2) 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 (Fx, Cy, Gz)–Γ24–Γ4 (Gx, Ay, Fz) 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–r4) 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 (−ΔSm) 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).

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高熵正铁氧体单晶中的磁相变和连续自旋切换
稀土正铁 REFeO3(其中 RE 是一种稀土离子)正受到越来越多的关注。我们以等摩尔比掺杂了五种稀土离子,制备了高熵正铁(Tm0.2Nd0.2Dy0.2Y0.2Yb0.2)FeO3(HEOR),并采用光学浮区法生长了单晶。它在高构型熵的作用下强烈倾向于形成单相结构。在低温区(11.6-14.4 K),发生了Γ2(Fx、Cy、Gz)-Γ24-Γ4(Gx、Ay、Fz)的自旋重新定向转变(SRT)。来自铁亚晶格畸变的弱铁磁(FM)力矩从 a 轴旋转到 c 轴。两步动态过程(Γ2-Γ24-r4)是通过交流电感测量确定的。HEOR 中的 SRT 可在 50-60000 Oe 的范围内进行调整,这比对等系统中的正铁氧体大一个数量级,使其成为高场自旋传感的候选材料。典型的自旋切换(SSW)和连续自旋切换(CSSW)效应是由于 RE-Fe 亚晶格之间的强相互作用而在低磁场下发生的。CSSW 效应在 20-50 Oe 之间可调,因此 HEOR 有可能应用于自旋调制器件。此外,由于磁熵变化(-ΔSm)具有很强的各向异性,而且制冷能力(RC)基于其高构型熵,HEOR有望通过改变晶体轴的取向(各向异性构型熵)为制冷提供一种新方法。
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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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