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Fe2−xGaxTeO6单晶中由自旋玻璃和反铁磁耦合诱导的巨交换偏置效应


Lin Huang(黄林), Bing Yu, Wenjing Zhai, Xiaomin Cui, Guanzhong Zhou, Junhu Zhang, Yongsen Tang, Shuhan Zheng, Lin Lin(林林), Zhibo Yan, and Jun-Ming Liu(刘俊明)

Giant exchange bias induced by spin-glass and antiferromagnetic coupling in Fe2−xGaxTeO6 single crystals

Applied Physical Letters 124, 232404 (2024)

It is known that the utilization of exchange bias (EB) effect for data storage underscores its importance. However, achieving a giant EB effect with a small cooling field (HCF) in single-phase materials remains a challenge. This study unveils a giant EB value within a single-phase material, Fe2−xGaxTeO6 (FGTO), originating from the anchoring of spin-glass phase by antiferromagnetic order. Manipulating the relative strengths of the spin-glass and antiferromagnetic order parameters by Ga3+-substitution of Fe3+ ions in the Fe2TeO6 lattice governs the magnitude of the EB effect. It is found that FGTO single crystals synthesized via the chemical vapor transport do exhibit a remarkably large EB value as large as 1.5 T at x = 0.50 and a quite small cooling field HCF = 50 Oe. Investigations on the training effect, minor loop, and relaxation behavior unravel the intricate dynamics inherent to the spin-glass state. This study not only establishes a platform for exploring the EB effect in single-phase materials but also illuminates potential applications of FGTO in the realm of spintronics.

URL: https://doi.org/10.1063/5.0206705