Temperature-induced magnetization reversal and ultra-fast magnetic switch at low field in SmFeO₃

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• 作者：Young Kyu Jeong^a ; ¹ ; Jung-Hoon Lee^a ; ¹ ; Suk-Jin Ahn^a ; Hyun M. Jang^a ; ^b ; ^{hmjang@postech.ac.kr}
• 关键词：A. Rare-earth ferrite ; D. Temperature-induced magnetization reversal ; D. Ultra-fast magnetization switch ; E. First-principles calculations
• 刊名：Solid State Communications
• 出版年：2012
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：July, 2012
• 卷：152
• 期：13
• 页码：1112-1115
• 文件大小：375 K

摘要

We have found that SmFeO₃, a family of rare-earth orthoferrites, exhibits temperature-induced magnetization reversal below the critical low-temperature along the a-axis of Pbnm symmetry. First-principles calculations demonstrate that this negative magnetization is mainly attributed to the competition between two magnetocrystalline anisotropy terms in the inequivalent magnetic sites of Sm³⁺ and Fe³⁺. Interestingly, the room temperature magnetization-field curve further shows an ultra-fast magnetization switch in the low-magnetic field, suggesting a potential applicability to high-speed magnetic switching devices.