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Magnetic and Magneto-Optical Properties of Sputter-Deposited and Annealed Co-Pt Alloys

Published online by Cambridge University Press:  15 February 2011

Sung-Eon Park ,
Pu-Young Jung ,
Ki-Bum Kim ,
Seh-Kwang Lee  and
Soon-Gwang Kim
Sung-Eon Park
Affiliation:
Department of Metallurgical Engineering, Seoul National University, Seoul, KOREA
Pu-Young Jung
Affiliation:
Department of Metallurgical Engineering, Seoul National University, Seoul, KOREA
Ki-Bum Kim
Affiliation:
Department of Metallurgical Engineering, Seoul National University, Seoul, KOREA
Seh-Kwang Lee
Affiliation:
Materials Design Laboratory, Korean Institute of Science and Technology, Seoul, KOREA
Soon-Gwang Kim
Affiliation:
Materials Design Laboratory, Korean Institute of Science and Technology, Seoul, KOREA
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Abstract

We have produced Co1-xPtX (X = 0.53 and 0.75) alloy films using DC magnetron sputtering and investigated their magnetic properties using vibrating sample magnetometry(VSM) and Kerr hysteresis loop tracer. The as-deposited Co-Pt alloy films show a strong in-plane magnetization. By annealing the alloy samples, we have identified that the magnetic properties are drastically changed. While the magnetic properties of the Co0 25Pt0 75 alloy films show no noticeable changes, the coercivity and the squareness of the Co0.47Pt0.53 alloy films are drastically increased after annealing. Transmission electron microscopy(TEM) and x-ray diffractometry(XRD) analysis showed that CoPt(L10) and Co-Pt3 (L12) ordered phases, respectively, are formed in each case with a strong (11) texture. We suggest that the perpendicular magnetic anisotropy in the Co-Pt system does not depend on the mere textureness of the layer but strongly depends on the arrangement of Co and Pt at an atomic scale.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 343: Symposium H – Polycrystalline Thin Films - Structure, Texture, Properties and Applications , 1994 , 387
Copyright
Copyright © Materials Research Society 1994

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References

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