npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2021; 71: 6-10

Published online January 29, 2021 https://doi.org/10.3938/NPSM.71.6

Copyright © New Physics: Sae Mulli.

Study on the Magnetization Reversal Behaviors of Pt/Co/Pt Films Depending on the Direction of the External Magnetic Field

Hak-Su KIM, Kwang-Su RYU*

Department of Physics Education, Korea National University of Education, Cheongju 28173, Korea

Correspondence to:ksryu@knue.ac.kr

Received: July 17, 2020; Revised: December 4, 2020; Accepted: December 5, 2020

Abstract

We measure the dependence of the change in the magnetization reversal phenomenon on the magnetic-field direction in a Pt/Co/Pt thin film by using the magneto-optical Kerr measurement that can measure both the magnetic hysteresis curve and the magnetic viscous curve by controlling the direction of the magnetic field. Interestingly, the magnetic viscous curves with respect to the magnetic field showed that the magnetization reversals of the Pt/Co/Pt films could be well explained by using the thermal activation model. Also, we found that the thermal activation volumes at all samples increased as the direction of the external magnetic field deviated from the easy axis of magnetization. This implies that the propagation of the magnetic domain walls is influenced not only by the easy-axis component of the external magnetic field but also by its hard-axis component during magnetization reversal.

Keywords: Magnetization reversal, Domain wall motion, Thermal activation model, Activation volume, Pt/Co/Pt film

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