Dynamics of magnetization in ferromagnet with spin-transfer torque

doi:10.1088/1674-1056/23/11/117502

Abstract

We review our recent works on dynamics of magnetization in ferromagnet with spin-transfer torque. Driven by constant spin-polarized current, the spin-transfer torque counteracts both the precession driven by the effective field and the Gilbert damping term different from the common understanding. When the spin current exceeds the critical value, the conjunctive action of Gilbert damping and spin-transfer torque leads naturally the novel screw-pitch effect characterized by the temporal oscillation of domain wall velocity and width. Driven by space- and time-dependent spin-polarized current and magnetic field, we expatiate the formation of domain wall velocity in ferromagnetic nanowire. We discuss the properties of dynamic magnetic soliton in uniaxial anisotropic ferromagnetic nanowire driven by spin-transfer torque, and analyze the modulation instability and dark soliton on the spin wave background, which shows the characteristic breather behavior of the soliton as it propagates along the ferromagnetic nanowire. With stronger breather character, we get the novel magnetic rogue wave and clarify its formation mechanism. The generation of magnetic rogue wave mainly arises from the accumulation of energy and magnons toward to its central part. We also observe that the spin-polarized current can control the exchange rate of magnons between the envelope soliton and the background, and the critical current condition is obtained analytically. At last, we have theoretically investigated the current-excited and frequency-adjusted ferromagnetic resonance in magnetic trilayers. A particular case of the perpendicular analyzer reveals that the ferromagnetic resonance curves, including the resonant location and the resonant linewidth, can be adjusted by changing the pinned magnetization direction and the direct current. Under the control of the current and external magnetic field, several magnetic states, such as quasi-parallel and quasi-antiparallel stable states, out-of-plane precession, and bistable states can be realized. The precession frequency can be expressed as a function of the current and external magnetic field.

Keywords: spin-transfer torque domain wall soliton ferromagnetic resonance

Received: 26 July 2014
Revised: 24 September 2014
Accepted manuscript online:

PACS:	75.60.Ch	(Domain walls and domain structure)
	72.25.Ba	(Spin polarized transport in metals)
	75.78.-n	(Magnetization dynamics)
	75.40.Gb	(Dynamic properties?)

Fund:

Project supported by the Natural Science Foundation of Hebei Province of China (Grant No. A2012202022). P. B. He was supported by the Aid Program for Young Teachers of Hunan University, the Project-sponsored by SRF for ROCS, SEM, and the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institution of Hunan Province, China. W. M. Liu was supported by the National Basic Research Program of China (Grant Nos. 2011CB921502 and 2012CB821305) and the National Natural Science Foundation of China (Grant Nos. 61227902 and 61378017).

Corresponding Authors: Li Zai-Dong
E-mail: lizd2018@live.com

Cite this article:

Li Zai-Dong (李再东), He Peng-Bin (贺鹏斌), Liu Wu-Ming (刘伍明) Dynamics of magnetization in ferromagnet with spin-transfer torque 2014 Chin. Phys. B 23 117502

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