Dynamics of Magnetic Domain Walls in Nanomagnetic Systems

Ono, Teruo; Shinjo, Teruya

doi:10.1016/b978-0-444-53114-8.00004-2

Cited by 2 publications

(1 citation statement)

References 82 publications

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“…Manipulation of magnetization by electric currents [1][2][3] has been studied intensively for a decade because of promising spintronic applications. 4 Among them, it was demonstrated theoretically 5 and experimentally 6 that an electric current in a conducting ferromagnet can drive magnetic textures such as domain walls and vortices. This is understood as due to spin torques that a current exerts on magnetization through a microscopic exchange interaction.…”

Section: Introductionmentioning

confidence: 99%

Spin and charge transport induced by gauge fields in a ferromagnet

Shibata

Kohno

2011

Phys. Rev. B

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We present a microscopic theory of spin-dependent motive force ("spin motive force") induced by magnetization dynamics in a conducting ferromagnet, by taking account of spin relaxation of conduction electrons. The theory is developed by calculating spin and charge transport driven by two kinds of gauge fields; one is the ordinary electromagnetic field $A^{\rm em}_{\mu}$, and the other is the effective gauge field $A^{z}_{\mu}$ induced by dynamical magnetic texture. The latter acts in the spin channel and gives rise to a spin motive force. It is found that the current induced as a linear response to $A^{z}_{\mu}$ is not gauge-invariant in the presence of spin-flip processes. This fact is intimately related to the non-conservation of spin via Onsager reciprocity, so is robust, but indicates a theoretical inconsistency. This problem is resolved by considering the time dependence of spin-relaxation source terms in the "rotated frame", as in the previous study on Gilbert damping [J. Phys. Soc. Jpn. {\bf 76}, 063710 (2007)]. This effect restores the gauge invariance while keeping spin non-conservation. It also gives a dissipative spin motive force expected as a reciprocal to the dissipative spin torque ("$\beta$-term").Comment: 13 pages, 3 figures, submitted to PR

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Section: Introductionmentioning

confidence: 99%

Spin and charge transport induced by gauge fields in a ferromagnet

Shibata

Kohno

2011

Phys. Rev. B

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Artificial multilayers and nanomagnetic materials

Shinjo

2013

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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The author has been actively engaged in research on nanomagnetic materials for about 50 years. Nanomagnetic materials are comprised of ferromagnetic systems for which the size and shape are controlled on a nanometer scale. Typical examples are ultrafine particles, ultrathin films, multilayered films and nano-patterned films. In this article, the following four areas of the author’s studies are described.(1) Mössbauer spectroscopic studies of nanomagnetic materials and interface magnetism.(2) Preparation and characterization of metallic multilayers with artificial superstructures.(3) Giant magnetoresistance (GMR) effect in magnetic multilayers.(4) Novel properties of nanostructured ferromagnetic thin films (dots and wires).A subject of particular interest in the author’s research was the artificially prepared multilayers consisting of metallic elements. The motivation to initiate the multilayer investigation is described and the physical properties observed in the artificial multilayers are introduced. The author’s research was initially in the field of pure physical science and gradually extended into applied science. His achievements are highly regarded not only from the fundamental point of view but also from the technological viewpoint.

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Dynamics of Magnetic Domain Walls in Nanomagnetic Systems

Cited by 2 publications

References 82 publications

Spin and charge transport induced by gauge fields in a ferromagnet

Spin and charge transport induced by gauge fields in a ferromagnet

Artificial multilayers and nanomagnetic materials

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