Magnetic domain walls displacement: Automotion versus spin-transfer torque

Current-induced spin-transfer torques (STTs) have been studied in Fe , Co and Ni domain walls (DWs) by the method based on the first-principles noncollinear calculations of scattering wavefunctions expanded in the tight-binding linearized muffin-tin orbital (TB-LMTO) basis. The results show that the out-of-plane component of nonadiabatic STT in Fe DW has localized form, which is in contrast to the typical nonlocal oscillating nonadiabatic torques obtained in Co and Ni DWs. Meanwhile, the degree of nonadiabaticity in STT is also much greater for Fe DW. Further, our results demonstrate that compared to the well-known first-order nonadiabatic STT, the torque in the third-order spatial derivative of local spin can better describe the distribution of localized nonadiabatic STT in Fe DW. The dynamics of local spin driven by this third-order torques in Fe DW have been investigated by the Landau–Lifshitz–Gilbert (LLG) equation. The calculated results show that with the same amplitude of STTs the DW velocity induced by this third-order term is about half of the wall speed for the case of the first-order nonadiabatic STT.

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Magnetic Domain Walls in Nanowires

MRS Bulletin ◽

10.1557/mrs2006.100 ◽

2006 ◽

Vol 31 (5) ◽

pp. 395-399 ◽

Cited By ~ 11

Author(s):

Rolf Allenspach ◽

Pierre-Olivier Jubert

Keyword(s):

Domain Wall ◽

Domain Walls ◽

Magnetic Domain ◽

Electrical Current ◽

Spin Transfer ◽

Wall Structure ◽

Conduction Electrons ◽

Magnetic Domain Walls ◽

Complex Spin ◽

Small Elements

AbstractFor many decades, it was assumed that the characteristics of magnetic domain walls were determined by material properties and the walls were moved by magnetic fields.In the past few years, it has been shown that domain walls behave differently on the nanometer scale.Domain walls in small elements exhibit complex spin arrangements that strongly deviate from the wall types commonly encountered in magnetic thin-film systems, and they can be modified by changing the geometry of the element.Domain walls in nanowires can also be moved by injecting electrical current pulses.Whereas wall propagation is qualitatively explained by a spin transfer from the conduction electrons to the spins of the domain wall, important aspects of the observations cannot be explained by present models.Examples include the observation of a drastic transformation of the wall structure upon current injection and domain wall velocities that tend to be orders of magnitude smaller than anticipated from theory.

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Thermal spin-transfer torques on magnetic domain walls

Solid State Communications ◽

10.1016/j.ssc.2009.09.034 ◽

2010 ◽

Vol 150 (11-12) ◽

pp. 548-551 ◽

Cited By ~ 26

Author(s):

Zhe Yuan ◽

Shuai Wang ◽

Ke Xia

Keyword(s):

Domain Walls ◽

Magnetic Domain ◽

Spin Transfer ◽

Magnetic Domain Walls

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Mutual control of coherent spin waves and magnetic domain walls in a magnonic device

Science ◽

10.1126/science.aau2610 ◽

2019 ◽

Vol 366 (6469) ◽

pp. 1121-1125 ◽

Cited By ~ 22

Author(s):

Jiahao Han ◽

Pengxiang Zhang ◽

Justin T. Hou ◽

Saima A. Siddiqui ◽

Luqiao Liu

Keyword(s):

Spin Wave ◽

Domain Walls ◽

Spin Waves ◽

Spin Current ◽

Magnetic Domain ◽

Spin Transfer Torque ◽

Successful Implementation ◽

Domain Structures ◽

Magnetic Domain Walls ◽

Coherent Spin

The successful implementation of spin-wave devices requires efficient modulation of spin-wave propagation. Using cobalt/nickel multilayer films, we experimentally demonstrate that nanometer-wide magnetic domain walls can be applied to manipulate the phase and magnitude of coherent spin waves in a nonvolatile manner. We further show that a spin wave can, in turn, be used to change the position of magnetic domain walls by means of the spin-transfer torque effect generated from magnon spin current. This mutual interaction between spin waves and magnetic domain walls opens up the possibility of realizing all-magnon spintronic devices, in which one spin-wave signal can be used to control others by reconfiguring magnetic domain structures.

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INFLUENCE OF THE DISLOCATION STRUCTURES ON THE BEHAVIOUR OF MAGNETIC DOMAIN WALLS IN HIGH PURITY IRON

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1981595 ◽

1981 ◽

Vol 42 (C5) ◽

pp. C5-627-C5-632 ◽

Cited By ~ 1

Author(s):

B. Astie ◽

J. Degauque

Keyword(s):

High Purity ◽

Domain Walls ◽

Magnetic Domain ◽

Magnetic Domain Walls ◽

Purity Iron ◽

High Purity Iron

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Introduction of spin torques

10.1093/oso/9780198787075.003.0019 ◽

2017 ◽

Author(s):

T. Kimura

Keyword(s):

Angular Momentum ◽

Giant Magnetoresistance ◽

Spontaneous Magnetization ◽

Magnetic Domain ◽

Magnetic Multilayers ◽

Transfer Effect ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Spin Angular Momentum ◽

Spin Torques

This chapter discusses the spin-transfer effect, which is described as the transfer of the spin angular momentum between the conduction electrons and the magnetization of the ferromagnet that occurs due to the conservation of the spin angular momentum. L. Berger, who introduced the concept in 1984, considered the exchange interaction between the conduction electron and the localized magnetic moment, and predicted that a magnetic domain wall can be moved by flowing the spin current. The spin-transfer effect was brought into the limelight by the progress in microfabrication techniques and the discovery of the giant magnetoresistance effect in magnetic multilayers. Berger, at the same time, separately studied the spin-transfer torque in a system similar to Slonczewski’s magnetic multilayered system and predicted spontaneous magnetization precession.

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