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      Spin-orbit torque induced magnetization anisotropy modulation in Pt/(Co/Ni)4/Co/IrMn heterostructure

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      Spin-orbit torque induced magnetization anisotropy modulation in Pt (Co Ni)4 Co IrMn.pdf (1.367Mb)
      Author
      Engel, Christian
      Goolaup, Sarjoosing
      Luo, Feilong
      Gan, Weiliang
      Lew, Wen Siang
      Date of Issue
      2017
      School
      School of Physical and Mathematical Sciences
      Version
      Published version
      Abstract
      In this work, we show that domain wall (DW) dynamics within a system provide an alternative platform to characterizing spin-orbit torque (SOT) effective fields. In perpendicularly magnetized wires with a Pt/(Co/Ni)4/Co/IrMn stack structure, differential Kerr imaging shows that the magnetization switching process is via the nucleation of the embryo state followed by domain wall propagation. By probing the current induced DW motion in the presence of in-plane field, the SOT effective fields are obtained using the harmonic Hall voltage scheme. The effective anisotropy field of the structure decreases by 12% due to the SOT effective fields, as the in-plane current in the wire is increased.
      Subject
      Magnetic anisotropy
      Magnetic fields
      Type
      Journal Article
      Series/Journal Title
      Journal of Applied Physics
      Rights
      © 2017 American Institute of Physics (AIP). This paper was published in Journal of Applied Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: [http://dx.doi.org/10.1063/1.4980108]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
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      http://dx.doi.org/10.1063/1.4980108
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