Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143525
Title: Spin-orbit torque induced multi-state magnetization switching in Co/Pt Hall cross structures at elevated temperatures
Authors: Lim, Gerard Joseph
Gan, Weiliang
Law, Wai Cheung
Murapaka, Chandrasekhar
Lew, Wen Siang
Keywords: Science
Issue Date: 2020
Source: Lim, G. J., Gan, W., Law, W. C., Murapaka, C., & Lew, W. S. (2020). Spin-orbit torque induced multi-state magnetization switching in Co/Pt Hall cross structures at elevated temperatures. Journal of Magnetism and Magnetic Materials, 514, 167201-. doi:10.1016/j.jmmm.2020.167201
Journal: Journal of Magnetism and Magnetic Materials
Abstract: We demonstrate spin-orbit torque (SOT) driven multi-state magnetization switching in Co/Pt Hall crosses in the presence of varying externally applied in-plane fields from room temperature (RT = 295 K) to 360 K. In-situ Kerr imaging at various resistance states reveal the evolution of up and down magnetic domain expansion due to current-induced SOT switching. The control of magnetization states in the Hall cross is shown to be attributed to the non-uniform current-density and the resultant effective out-of-plane field due to the device geometry. The critical switching current density scales inversely with device temperature, and the SOT-driven change in Hall resistance varies across device temperatures and the applied in-plane fields. Additionally, the current-induced SOT efficiency, χsat, and the Dzyaloshinskii-Moriya interaction effective field, HDMI, at RT and 360 K are determined using the chiral domain wall model and current-induced loop-shift method. The χsat and HDMI values are found to decrease by ~15% and ~26%, respectively, with increasing device temperature. These results demonstrate the thermal sensitivity of current-induced SOT magnetization switching in multi-state devices.
URI: https://hdl.handle.net/10356/143525
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2020.167201
Rights: © 2020 Elsevier. All rights reserved. This paper was published in Journal of Magnetism and Magnetic Materials and is made available with permission of Elsevier.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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