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Domain wall dynamics driven by a circularly polarized magnetic field in ferrimagnet:effect of Dzyaloshinskii-Moriya interaction

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Rare Metals 2022年第11期41卷 3815-3822页

作者： Ting-Ting Liu Yi-Fei Hu Yang Liu Zhe-Jun-Yu Jin Zheng-Hua Tang Ming-Hui Qin Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China School of Physics and Electronic and Electrical Engineering Xiangnan UniversityChenzhou423000China

In this work,we study the domain wall motion in ferrimagnet driven by a circularly polarized magnetic field using the collective coordinate theory and atomistic micromagnetic simulations,and we pay particular attention to the effect of Dzyaloshinskii-Moriya interaction(DMI).Similar to the case of antiferromagnetic domain wall,ferrimagnetic wall moves at a speed which is linearly dependent on the DMI magnitude.In addition,it is revealed that the DMI plays a role in modulating the domain wall dynamics similar to that of the net spin density,which suggests another internal parameter for controlling domain wall in ferrimagnets.Moreover,the results show that the domain wall dynamics in ferrimagnets is much faster than that in ferromagnets,which confirms again the great potential of ferrimagnets in future spintronic applications.

关键词： Domain wall dynamics Spintronics Circularly polarized magnetic field ferrimagnets

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Field-induced Néel vector bi-reorientation of a ferrimagnetic insulator in the vicinity of compensation temperature

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Chinese Physics B 2021年第2期30卷 481-486页

作者：王鹏赵辉栾仲智夏思宇丰韬周礼繁 College of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266061China National Laboratory of Solid State Microstructures Jiangsu Provincial Key Laboratory for Nanotechnology and Department of PhysicsNanjing UniversityNanjing 210093China

The spin Hall magnetoresistance(SMR)effect in Pt/Gd_(3)Fe_(5)O_(12)(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.

关键词： spin Hall magnetoresistance ferrimagnets magnetic insulators magnetization switching

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