Spin diffusion and torques in disordered antiferromagnets

Handle URI:
http://hdl.handle.net/10754/623912
Title:
Spin diffusion and torques in disordered antiferromagnets
Authors:
Manchon, Aurelien ( 0000-0002-4768-293X )
Abstract:
We have developed a drift-diffusion equation of spin transport in collinear bipartite metallic antiferromagnets. Starting from a model tight-binding Hamiltonian, we obtain the quantum kinetic equation within Keldysh formalism and expand it to the lowest order in spatial gradient using Wigner expansion method. In the diffusive limit, these equations track the spatio-temporal evolution of the spin accumulations and spin currents on each sublattice of the antiferromagnet. We use these equations to address the nature of the spin transfer torque in (i) a spin-valve composed of a ferromagnet and an antiferromagnet, (ii) a metallic bilayer consisting of an antiferromagnet adjacent to a heavy metal possessing spin Hall effect, and in (iii) a single antiferromagnet possessing spin Hall effect. We show that the latter can experience a self-torque thanks to the non-vanishing spin Hall effect in the antiferromagnet.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Manchon A (2017) Spin diffusion and torques in disordered antiferromagnets. Journal of Physics: Condensed Matter 29: 104002. Available: http://dx.doi.org/10.1088/1361-648X/aa521d.
Publisher:
IOP Publishing
Journal:
Journal of Physics: Condensed Matter
KAUST Grant Number:
OSR- 2015-CRG4-2626
Issue Date:
1-Feb-2017
DOI:
10.1088/1361-648X/aa521d
Type:
Article
ISSN:
0953-8984; 1361-648X
Sponsors:
This work was supported by the King Abdullah University of Science and Technology (KAUST) through the Office of Sponsored Research (OSR) (Grant Number OSR- 2015-CRG4-2626). The author acknowledges inspiring discussions with T Jungwirth, J Sinova, J Zelezny, H Gomonay and H Saidaoui.
Additional Links:
http://iopscience.iop.org/article/10.1088/1361-648X/aa521d/meta;jsessionid=537FE0C78018F45A950F11D210A08C03.c1.iopscience.cld.iop.org
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorManchon, Aurelienen
dc.date.accessioned2017-05-31T11:23:13Z-
dc.date.available2017-05-31T11:23:13Z-
dc.date.issued2017-02-01en
dc.identifier.citationManchon A (2017) Spin diffusion and torques in disordered antiferromagnets. Journal of Physics: Condensed Matter 29: 104002. Available: http://dx.doi.org/10.1088/1361-648X/aa521d.en
dc.identifier.issn0953-8984en
dc.identifier.issn1361-648Xen
dc.identifier.doi10.1088/1361-648X/aa521den
dc.identifier.urihttp://hdl.handle.net/10754/623912-
dc.description.abstractWe have developed a drift-diffusion equation of spin transport in collinear bipartite metallic antiferromagnets. Starting from a model tight-binding Hamiltonian, we obtain the quantum kinetic equation within Keldysh formalism and expand it to the lowest order in spatial gradient using Wigner expansion method. In the diffusive limit, these equations track the spatio-temporal evolution of the spin accumulations and spin currents on each sublattice of the antiferromagnet. We use these equations to address the nature of the spin transfer torque in (i) a spin-valve composed of a ferromagnet and an antiferromagnet, (ii) a metallic bilayer consisting of an antiferromagnet adjacent to a heavy metal possessing spin Hall effect, and in (iii) a single antiferromagnet possessing spin Hall effect. We show that the latter can experience a self-torque thanks to the non-vanishing spin Hall effect in the antiferromagnet.en
dc.description.sponsorshipThis work was supported by the King Abdullah University of Science and Technology (KAUST) through the Office of Sponsored Research (OSR) (Grant Number OSR- 2015-CRG4-2626). The author acknowledges inspiring discussions with T Jungwirth, J Sinova, J Zelezny, H Gomonay and H Saidaoui.en
dc.publisherIOP Publishingen
dc.relation.urlhttp://iopscience.iop.org/article/10.1088/1361-648X/aa521d/meta;jsessionid=537FE0C78018F45A950F11D210A08C03.c1.iopscience.cld.iop.orgen
dc.subjectantiferromagnetsen
dc.subjectspin transfer torqueen
dc.subjectspintronicsen
dc.titleSpin diffusion and torques in disordered antiferromagnetsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Physics: Condensed Matteren
kaust.authorManchon, Aurelienen
kaust.grant.numberOSR- 2015-CRG4-2626en
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