Control of spins in a nano-sized magnet using electric-current

doi:10.1088/1674-1056/26/4/047501

中国物理B ›› 2017, Vol. 26 ›› Issue (4): 47501-047501.doi: 10.1088/1674-1056/26/4/047501

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Control of spins in a nano-sized magnet using electric-current

Hong-yu Wen(文宏玉), Jian-bai Xia(夏建白)

The State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

收稿日期:2016-10-27 修回日期:2016-12-18 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: Jian-bai Xia E-mail:xiajb@semi.ac.cn

Control of spins in a nano-sized magnet using electric-current

Hong-yu Wen(文宏玉), Jian-bai Xia(夏建白)

The State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

Received:2016-10-27 Revised:2016-12-18 Online:2017-04-05 Published:2017-04-05
Contact: Jian-bai Xia E-mail:xiajb@semi.ac.cn

摘要/Abstract

摘要： With the development of spintronics, spin-transfer torque control of magnetic properties receives considerable attention. In this paper the Landau-Lifshitz-Gilbert equation including the torque term is used to investigate the magnetic moment dynamics in the free layer of the ferromagnet/non-magnetic/ferromagnet (FM1/N/FM2) structures. It is found that the reverse critical time τ_c decreases with the current increasing. The critical time τ_c as a function of current for the perpendicular and parallel easy magnetic axes are the same. The critical time τ_c increases with the damping factor α increasing. In the case of large current the influence of the damping factor α is smaller, but in the case of little torque the critical time τ_c increases greatly with the damping increasing. The direction of the magnetization in the fixed layer influences the critical time, when the angle between the magnetization and the z direction changes from 0.1π to 0.4π, the critical time τ_c decreases from 26.7 to 15.6.

关键词: magnetization switching, spin transfer torque, Landau-Lifshitz-Gilbert (LLG) equation

Abstract: With the development of spintronics, spin-transfer torque control of magnetic properties receives considerable attention. In this paper the Landau-Lifshitz-Gilbert equation including the torque term is used to investigate the magnetic moment dynamics in the free layer of the ferromagnet/non-magnetic/ferromagnet (FM1/N/FM2) structures. It is found that the reverse critical time τ_c decreases with the current increasing. The critical time τ_c as a function of current for the perpendicular and parallel easy magnetic axes are the same. The critical time τ_c increases with the damping factor α increasing. In the case of large current the influence of the damping factor α is smaller, but in the case of little torque the critical time τ_c increases greatly with the damping increasing. The direction of the magnetization in the fixed layer influences the critical time, when the angle between the magnetization and the z direction changes from 0.1π to 0.4π, the critical time τ_c decreases from 26.7 to 15.6.

Key words: magnetization switching, spin transfer torque, Landau-Lifshitz-Gilbert (LLG) equation

中图分类号: (Magnetization dynamics)

75.78.-n

77.80.Fm (Switching phenomena) 85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)

文宏玉, 夏建白. Control of spins in a nano-sized magnet using electric-current[J]. 中国物理B, 2017, 26(4): 47501-047501.

Hong-yu Wen(文宏玉), Jian-bai Xia(夏建白). Control of spins in a nano-sized magnet using electric-current[J]. Chin. Phys. B, 2017, 26(4): 47501-047501.

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Control of spins in a nano-sized magnet using electric-current

Control of spins in a nano-sized magnet using electric-current

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