Topological Hall effect in diffusive ferromagnetic thin films with spin-flip scattering

Zhang, Steven S. -L.; Heinonen, Olle

doi:10.1103/PhysRevB.97.134401

Title: Topological Hall effect in diffusive ferromagnetic thin films with spin-flip scattering

Journal Article · Mon Apr 02 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.134401· OSTI ID:1433913

Zhang, Steven S. -L. ^[1]; Heinonen, Olle ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern-Argonne Inst. of Science and Technology, Evanston, IL (United States)

In this paper, we study the topological Hall (TH) effect in a diffusive ferromagnetic metal thin film by solving a Boltzmann transport equation in the presence of spin-flip scattering. A generalized spin-diffusion equation is derived which contains an additional source term associated with the gradient of the emergent magnetic field that arises from skyrmions. Because of the source term, spin accumulation may build up in the vicinity of the skyrmions. This gives rise to a spin-polarized diffusion current that in general suppresses the bulk TH current. Only when the spin-diffusion length is much smaller than the skyrmion size does the TH resistivity approach the value derived by Bruno et al. [Phys. Rev. Lett. 93, 096806 (2004)]. Finally, we derive a general expression of the TH resistivity that applies to thin-film geometries with spin-flip scattering, and show that the corrections to the TH resistivity become large when the size of room temperature skyrmions is further reduced to tens of nanometers.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1433913

Alternate ID(s):: OSTI ID: 1430774

Journal Information:: Physical Review B, Vol. 97, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (2)

Topological and Chiral Spin Hall Effects Rozhansky, I. V.; Denisov, K. S.; Lifshits, M. B. physica status solidi (b), Vol. 256, Issue 6 https://doi.org/10.1002/pssb.201900033	journal	February 2019
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
skyrmions
spin accumulation
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