| Field-induced Néel vector bi-reorientation of a ferrimagnetic insulator in the vicinity of compensation temperature |
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| 引用本文： | 王鹏,赵辉,栾仲智,夏思宇,丰韬,周礼繁.Field-induced Néel vector bi-reorientation of a ferrimagnetic insulator in the vicinity of compensation temperature[J].中国物理 B,2021(2). |
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| 作者姓名： | 王鹏 赵辉 栾仲智 夏思宇 丰韬 周礼繁 |
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| 作者单位： | College of Mathematics and Physics;National Laboratory of Solid State Microstructures |
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| 基金项目： | Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0303202 and 2016YFA0300803);the National Natural Science Foundation of China(Grant Nos.11904194,11727808,and 11674159);the Fundamental Research Funds for the Central Universities,China(Grant No.020414380121)。 |
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| 摘 要： | The spin Hall magnetoresistance(SMR)effect in Pt/Gd3Fe5O12(Gd IG)bilayers was systematically investigated.The sign of SMR changes twice with increasing magnetic field in the vicinity of the magnetization compensation point(TM)of Gd IG.However,conventional SMR theory predicts the invariant SMR sign in the heterostructure composed of a heavy metal film in contact with a ferromagnetic or antiferromagnetic film.We conclude that this is because of the significant enhancement of the magnetic moment of the Gd sub-lattice and the unchanged moment of the Fe sub-lattice with a relatively large field,meaning that a small net magnetic moment is induced at TM.As a result,the Néel vector aligns with the field after the spin-flop transition,meaning that a bi-reorientation of the Néel vector is produced.Theoretical calculations based on the Néel’s theory and SMR theory also support our conclusions.Our findings indicate that the Néel-vector direction of a ferrimagnet can be tuned across a wide range by a relatively low external field around TM.
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| 关 键 词： | spin Hall magnetoresistance ferrimagnets magnetic insulators magnetization switching |
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