Magnetic-proximity-induced magnetoresistance on topological insulators

Takahiro Chiba, Saburo Takahashi, and Gerrit E. W. Bauer
Phys. Rev. B 95, 094428 – Published 28 March 2017

Abstract

We theoretically study the magnetoresistance (MR) of two-dimensional massless Dirac electrons as found on the surface of three-dimensional topological insulators (TIs) that are capped by a ferromagnetic insulator (FI). We calculate charge and spin transport by Kubo and Boltzmann theories, taking into account the ladder-vertex correction and the in-scattering due to normal and magnetic disorder. The induced exchange splitting is found to generate an electric conductivity that depends on the magnetization orientation, but its form is very different from both the anisotropic and the spin Hall MR. The in-plane MR vanishes identically for nonmagnetic disorder, while out-of-plane magnetizations cause a large MR ratio. On the other hand, we do find an in-plane MR and planar Hall effect in the presence of magnetic disorder aligned with the FI magnetization. Our results may help us understand recent transport measurements on TI|FI systems.

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  • Received 13 December 2016

DOI:https://doi.org/10.1103/PhysRevB.95.094428

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takahiro Chiba1,*, Saburo Takahashi1, and Gerrit E. W. Bauer1,2,3

  • 1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 2WPI-AIMR, Tohoku University, Sendai 980-8577, Japan
  • 3Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

  • *t.chiba@imr.tohoku.ac.jp

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Issue

Vol. 95, Iss. 9 — 1 March 2017

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