npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2020; 70: 304-310

Published online April 29, 2020 https://doi.org/10.3938/NPSM.70.304

Copyright © New Physics: Sae Mulli.

Temperature Dependence of Magnetic Anisotropy in Co/Pt film on VO$ _{2}$ with a Structural Transition

Won Jun JUNG, Santosh GHIMIRE, Joonghoe DHO*

Department of Physics, Kyungpook National University, Daegu 41566, Korea

Correspondence to:jhdho@knu.ac.kr

Received: December 9, 2019; Revised: January 16, 2020; Accepted: February 5, 2020

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fifty-nanometer thick (100) and (101) VO$ _{2}$ films were synthesized on C-plane and R-plane Al$ _{2}$O$ _{3}$ substrates using pulsed laser deposition. X-ray diffraction measurements suggested that the VO$ _{2}$ films with a root-mean-square roughness of 0.58 -- 1.08 nm had good crystalline properties. The temperature dependence of the resistance for the VO$ _{2}$ films displayed a metal-insulator transition behavior at T$ _{\text{MI}}$= 325 -- 350 K. Co/Pt multilayers with perpendicular magnetic anisotropy were deposited on (100) and (101) VO$ _{2}$ film by using DC sputtering, and their magnetic properties were monitored by using magneto-optic Kerr effect measurements. Although the VO$ _{2}$ has a structural transition from monoclinic to tetragonal at the T$ _{\text{MI}}$, the (100) VO$ _{2}$ plane seems to have opposite changes in the two in-plane lattice constants, so no net strain is induced in the neighboring Co/Pt film. On the other hand, the (101) VO$ _{2}$ with net changes in both in-plane lattice constants at the T$ _{\text{MI}}$ presumably provides interfacial stress to the neighboring Co/Pt film thus, it induces a net magnetoelastic effect, which results in an increases in the coercive fields of ~ 5 Oe along the easy axis and ~200 Oe along the hard axis.

Keywords: Vanadium oxide, Magnetic film, Perpendicular magnetic anisotropy

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