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Field-free spin-orbit torque switching of a perpendicular ferromagnet with Dzyaloshinskii-Moriya interaction

Chen, BingJin; Lourembam, James; Goolaup, Sarjoosing and Lim, Sze Ter (2019). Field-free spin-orbit torque switching of a perpendicular ferromagnet with Dzyaloshinskii-Moriya interaction. Applied Physics Letters, 114(2), article no. 022401.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1063/1.5052194
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Abstract

Leveraging on interfacial Dzyaloshinskii-Moriya interaction (DMI) induced intrinsic magnetization tilting in nanostructures, a parametric window enabling field-free spin-orbit torque (SOT) magnetization switching in a perpendicular ferromagnet is established. The critical current density (Jc) bounds for SOT switching are highly dependent on the DMI, producing a distorted diamond-shaped region bounded by the Jc-DMI curves. The widest Jc interval is found for DMI values between 0.5 mJ/m2 and 0.8 mJ/m2. Geometrical modulation, of the ferromagnetic layer, reveals that the circular structure is optimum for minimizing the switching energy while maximizing the parametric window. For all the structures investigated, the SOT induced reversal process is via domain wall nucleation and propagation, and the switching is practical at room temperature.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1077-3118
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetGrant No. A1818g0042RIE2020 AME Core Fund
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 60467
Depositing User: Vikram Goolaup
Date Deposited: 16 Apr 2019 10:04
Last Modified: 11 Jun 2020 21:50
URI: http://oro.open.ac.uk/id/eprint/60467
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