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Magnetic Properties and Magnetization Reversal of Sm–Co(3x nm)/Co(x nm) Multilayered Films

Published online by Cambridge University Press:  03 March 2011

Cai-Yin You ,
ChoongJin Yang ,
Z.D. Zhang ,
JongSoo Han  and
X.K. Sun
Cai-Yin You*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and Electromagnetic Materials Laboratory, Research Institute of Industrial Science and Technology (RIST), 790-330 Pohang, South Korea
ChoongJin Yang
Affiliation:
Electromagnetic Materials Laboratory, Research Institute of Industrial Science and Technology (RIST), 790-330 Pohang, South Korea
Z.D. Zhang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
JongSoo Han
Affiliation:
Electromagnetic Materials Laboratory, Research Institute of Industrial Science and Technology (RIST), 790-330 Pohang, South Korea
X.K. Sun
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: cyyou@imr.ac.cn
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Abstract

[Sm–Co (3x nm) /Co (x nm)]10 (x = 10, 7, 4) multilayered films have been prepared by magnetron rf-sputtering. It is found that the thickness of both hard and soft layers has important effects on phase transformation and magnetic interaction of films. With a fixed ratio of hard- to soft-layer thickness, decreasing simultaneously the thickness of these layers results in increasing coercivity. The effects of the external magnetic field during annealing depend on the Co-layer thickness (x value), mainly because of the formation of different main phases for different thickness of Co layer. For the films with x = 10 and 7, the main phase is Sm2Co17 after annealed. Applying a magnetic field during annealing promotes the crystallization of films, and therefore, it increases the coercivity of the films with x = 10 and 7. Magnetic interaction has been investigated by measuring δm and remanence magnetization. All the films show that although the exchange coupling favorable for magnetization is significant, the increase of the coercivity mainly originates from improving the pinning effects. Temperature dependence of the coercivity supports that the pinning of domain-walls constitutes a control mechanism of the coercivity. This behavior can be well understood in terms of the Gaunt’s approach of the coercivity.

Keywords

SputteringMagnetic propertiesThin film
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 786 - 794
Copyright
Copyright © Materials Research Society 2004

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