Effect of spin diffusion on current generated by spin motive force

Kyoung Whan Kim, Jung Hwan Moon, Kyoung Jin Lee, Hyun Woo Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Spin motive force is a spin-dependent force on conduction electrons induced by magnetization dynamics. To examine its effects on magnetization dynamics, it is indispensable to take into account spin accumulation, spin diffusion, and spin-flip scattering since the spin motive force is, in general, nonuniform. We examine the effects of all these on the way the spin motive force generates the charge and spin currents in conventional situations, where the conduction electron spin relaxation dynamics is much faster than the magnetization dynamics. When the spin-dependent electric field is spatially localized, which is common in experimental situations, we find that the conservative part of the spin motive force is unable to generate the charge current due to the cancellation effect by the diffusion current. We also find that the spin current is a nonlocal function of the spin motive force and can be effectively expressed in terms of nonlocal Gilbert damping tensor. It turns out that any spin-independent potential such as Coulomb potential does not affect our principal results. At the last part of this paper, we apply our theory to current-induced domain wall motion.

Original languageEnglish
Article number054462
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number5
DOIs
Publication statusPublished - 2011 Aug 17

Fingerprint

Magnetization
Electrons
Domain walls
Induced currents
Tensors
Damping
Electric fields
Scattering
conduction electrons
magnetization
Coulomb potential
cancellation
electron spin
domain wall
damping
tensors
electric fields
scattering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Effect of spin diffusion on current generated by spin motive force. / Kim, Kyoung Whan; Moon, Jung Hwan; Lee, Kyoung Jin; Lee, Hyun Woo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 5, 054462, 17.08.2011.

Research output: Contribution to journalArticle

@article{ca16076667d2479ebfdcfca8541304d0,
title = "Effect of spin diffusion on current generated by spin motive force",
abstract = "Spin motive force is a spin-dependent force on conduction electrons induced by magnetization dynamics. To examine its effects on magnetization dynamics, it is indispensable to take into account spin accumulation, spin diffusion, and spin-flip scattering since the spin motive force is, in general, nonuniform. We examine the effects of all these on the way the spin motive force generates the charge and spin currents in conventional situations, where the conduction electron spin relaxation dynamics is much faster than the magnetization dynamics. When the spin-dependent electric field is spatially localized, which is common in experimental situations, we find that the conservative part of the spin motive force is unable to generate the charge current due to the cancellation effect by the diffusion current. We also find that the spin current is a nonlocal function of the spin motive force and can be effectively expressed in terms of nonlocal Gilbert damping tensor. It turns out that any spin-independent potential such as Coulomb potential does not affect our principal results. At the last part of this paper, we apply our theory to current-induced domain wall motion.",
author = "Kim, {Kyoung Whan} and Moon, {Jung Hwan} and Lee, {Kyoung Jin} and Lee, {Hyun Woo}",
year = "2011",
month = "8",
day = "17",
doi = "10.1103/PhysRevB.84.054462",
language = "English",
volume = "84",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Institute of Physics Publising LLC",
number = "5",

}

TY - JOUR

T1 - Effect of spin diffusion on current generated by spin motive force

AU - Kim, Kyoung Whan

AU - Moon, Jung Hwan

AU - Lee, Kyoung Jin

AU - Lee, Hyun Woo

PY - 2011/8/17

Y1 - 2011/8/17

N2 - Spin motive force is a spin-dependent force on conduction electrons induced by magnetization dynamics. To examine its effects on magnetization dynamics, it is indispensable to take into account spin accumulation, spin diffusion, and spin-flip scattering since the spin motive force is, in general, nonuniform. We examine the effects of all these on the way the spin motive force generates the charge and spin currents in conventional situations, where the conduction electron spin relaxation dynamics is much faster than the magnetization dynamics. When the spin-dependent electric field is spatially localized, which is common in experimental situations, we find that the conservative part of the spin motive force is unable to generate the charge current due to the cancellation effect by the diffusion current. We also find that the spin current is a nonlocal function of the spin motive force and can be effectively expressed in terms of nonlocal Gilbert damping tensor. It turns out that any spin-independent potential such as Coulomb potential does not affect our principal results. At the last part of this paper, we apply our theory to current-induced domain wall motion.

AB - Spin motive force is a spin-dependent force on conduction electrons induced by magnetization dynamics. To examine its effects on magnetization dynamics, it is indispensable to take into account spin accumulation, spin diffusion, and spin-flip scattering since the spin motive force is, in general, nonuniform. We examine the effects of all these on the way the spin motive force generates the charge and spin currents in conventional situations, where the conduction electron spin relaxation dynamics is much faster than the magnetization dynamics. When the spin-dependent electric field is spatially localized, which is common in experimental situations, we find that the conservative part of the spin motive force is unable to generate the charge current due to the cancellation effect by the diffusion current. We also find that the spin current is a nonlocal function of the spin motive force and can be effectively expressed in terms of nonlocal Gilbert damping tensor. It turns out that any spin-independent potential such as Coulomb potential does not affect our principal results. At the last part of this paper, we apply our theory to current-induced domain wall motion.

UR - http://www.scopus.com/inward/record.url?scp=80052369673&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80052369673&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.84.054462

DO - 10.1103/PhysRevB.84.054462

M3 - Article

VL - 84

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 5

M1 - 054462

ER -