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Effects of Ta on the Microstructure and Magnetic Properties of FePt Thin Films

Published online by Cambridge University Press:  21 March 2011

Sangho Jin ,
Sung Uk Jang  and
Soon-Ju Kwon
Sangho Jin
Affiliation:
Materials Science and Engineering, POSTECH, Hyoja-Dong, Nam-Gu, Pohang, 790–784, Korea, Republic of
Sung Uk Jang
Affiliation:
Materials Science and Engineering, POSTECH, Hyoja-Dong, Nam-Gu, Pohang, 790–784, Korea, Republic of
Soon-Ju Kwon
Affiliation:
Materials Science and Engineering, POSTECH, Hyoja-Dong, Nam-Gu, Pohang, 790–784, Korea, Republic of
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Abstract

We have studied the effect of Ta on the structure, magnetic properties and the ordering temperature of FePt(Ta) thin films. The samples are prepared by the dc and rf magnetron cosputtering method with 3 single element targets. After a deposition, the samples are annealed in a vacuum at various temperatures. The XRD patterns show strong (111) peaks at all annealing temperatures, but the change in the d-spacings reveals a disorder-order transformation. The more Ta is added to the FePt, the larger the coercivity becomes. The coercivity of the FePtTa40W film annealed at 700°C reaches about two times as large as the value of the pure FePt film. The delta m curves imply that Ta atoms diffuse into the grain boundary to reduce inter-granular exchange coupling, which leads the enhancement of coercivity

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 998: Symposium J – Nanoscale Magnetics and Device Applications , 2007 , 998-J05-12
Copyright
Copyright © Materials Research Society 2007

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References

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