Anisotropic magnetoresistance in a Ni 81 Fe 19 /SiO 2 /Ca-Bi 2 Se 3 hybrid structure

Sung Jong Kim, Youn Ho Park, Chaun Jang, Andrzej Hruban, Hyun Cheol Koo

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    A topological insulator gives a great concern in the field of thin film devices because it delivers a conducting state and a high spin-momentum locking at the material surface. To investigate the interfacial coupling between ferromagnet and topological insulator, the anisotropic magnetoresistance (AMR) in a Ni 81 Fe 19 /SiO 2 /Ca-doped Bi 2 Se 3 structure is observed. The AMR is determined by the alignment between the magnetization direction of a ferromagnetic electrode and the bias current direction. The bias current induces a strong spin-momentum locking along the transverse direction which changes the magnetic anisotropy and switching process of the ferromagnetic layer. Furthermore, the angle dependence of magnetoresistance clearly shows that the amplitude of AMR is enhanced due to the coupling of Ni 81 Fe 19 /SiO 2 /Ca-doped Bi 2 Se 3 hybrid structure. These results provide an efficient technique for manipulating magnetization reversal of the ferromagnetic material in spin-based devices.

    Original languageEnglish
    Pages (from-to)87-91
    Number of pages5
    JournalThin Solid Films
    Volume676
    DOIs
    Publication statusPublished - 2019 Apr 30

    Bibliographical note

    Funding Information:
    This work was supported by KIST & KU-KIST Institutional Programs and National Research Council of Science & Technology (NST) grant (No. CAP-16-01-KIST ) of the government of Korea (MSIP).

    Publisher Copyright:
    © 2019 Elsevier B.V.

    Copyright:
    Copyright 2019 Elsevier B.V., All rights reserved.

    Keywords

    • Anisotropic magnetoresistance
    • Magnetic anisotropy
    • Magnetic switching
    • Spin-momentum locking
    • Topological insulator

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Materials Chemistry

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