Effects on Magnetic Properties of GaMnAs Induced by Proximity of Topological Insulator Bi2Se3

Seul Ki Bac, Hakjoon Lee, Sangyeop Lee, Seonghoon Choi, Sanghoon Lee, X. Liu, M. Dobrowolska, J. K. Furdyna

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Effects induced by a topological insulator Bi2Se3 on the magnetic properties of an adjacent GaMnAs film have been investigated using transport measurements. We observed three conspicuous effects in the GaMnAs layer induced by the proximity of the Bi2Se3 overlayer. First, our resistivity data as a function of temperature show that the GaMnAs layer adjacent to the Bi2Se3 displayed strongly metallic behavior, as compared with the GaMnAs control specimen. Second, the Curie temperature of the GaMnAs in the bilayer was observed to be higher than that of the control layer, in our case by nearly a factor of two. Finally, we observed significant changes in the in-plane magnetic anisotropy of the GaMnAs in the bilayer, in the form of much higher values of both cubic and uniaxial anisotropy parameters. This latter feature manifests itself in a rather spectacular increase of the coercive field observed in magnetization reversal across the in-plane hard axis. These results suggest that proximity of an adjacent Bi2Se3 layer represents an important tool for modifying and controlling the ferromagnetic properties of GaMnAs film, and could thus be used to optimize this and similar materials for applications in spintronic devices.

Original languageEnglish
Pages (from-to)4308-4313
Number of pages6
JournalJournal of Electronic Materials
Issue number8
Publication statusPublished - 2018 Aug 1

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2015R1D1A1A01056614), by Korea University Grant, and by National Science Foundation Grant DMR 1400432.

Publisher Copyright:
© 2018, The Minerals, Metals & Materials Society.


  • Ferromagnetic semiconductors
  • anomalous Hall effect
  • planar Hall effects
  • proximity effects
  • topological insulator

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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