npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2019; 69: 1135-1140

Published online November 29, 2019 https://doi.org/10.3938/NPSM.69.1135

Copyright © New Physics: Sae Mulli.

Deposition Temperature-dependent Magnetic and Structural Property Variations of Co Films

Gongin LEE1, Tae-Seong JU1, Seojin YANG1, Sehwan SONG1, Jiwoong KIM1, Sungkyun PARK*1, Eun-Young KIM2

1Department of Physics, Pusan National University, Busan 46241, Korea

2Department of Physics, Chonbuk National University, Jeonju 54896, Korea

Correspondence to:psk@pusan.ac.kr

Received: July 18, 2019; Revised: September 10, 2019; Accepted: September 11, 2019

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

A series of Co films deposited on Al$ _{2}$O$ _{3}$(0001) substrates by using DC magnetron sputtering at various deposition temperatures. For the films deposited at temperatures above 200$^{\circ}$C, the crystallinity was observed from X-ray diffraction measurements even though distinguishing between the hcp and the fcc structures was difficult. The surface roughness increased while the crystallinity improved as the deposition temperature was increased. The rocking scan also revealed improved mosaicity as the deposition temperature was increased. In-plane magnetization measurements using magneto-optic Kerr effects exhibited the unusual anisotropic behaviors of the coercivity for the films with high crystallinity. However, the saturation magnetization increased with increasing deposition temperature, indicating that the saturation magnetization was closely correlated with the crystallinity of the film.

Keywords: Cobalt, Deposition temperature, Crystallinity, Magnetic anisotropy

Figures

Fig. 1. Angular dependence of the coercivity, obtained from L-MOKE loop of Co films, deposited at various temperatures. Zero degrees set to be the maximum in-plane coercivity.

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