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Exchange bias and training effect in NiCr2O4/Cr2O3 composite

Published online by Cambridge University Press:  16 September 2015

Wang Liguang ,
Zhu Changming ,
Tian Zhaoming  and
Yuan Songliu
Wang Liguang
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
Zhu Changming
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
Tian Zhaoming
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
Yuan Songliu*
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

NiCr2O4/Cr2O3 system with ferrimagnetic spinel and antiferromagnetic transition metal oxide has been firstly synthesized by a chemical co-precipitation method. Magnetic measurements on this system also exhibit the exchange bias (EB) and training effect for the first time. EB effect with evident shift of coercive field and remnant magnetization can be detected at low temperature after field cooling from 350 K. The EB field can reach about 2037 Oe and the magnetization shift is as large as 0.129 emu/g at 10 K. Furthermore, EB effect recedes gradually with temperature increasing and disappears at about 70 K. In this process, EB field decreases with a linear dependence on the magnetization shift. This EB behavior is discussed according to the disordered regions existed at the interface between NiCr2O4 and Cr2O3. In addition, we have analyzed the training effect, which indicates the coexistence of two distinct forms of training mechanism during cycle procedure. One is concerned with an athermal impact resulting in the abrupt single cycle training and the other is gradual reduction of EB field during the subsequent cycles due to the conventional thermal activation mechanism.

Keywords

ceramicmagnetic propertiescomposite
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 21 , 13 November 2015 , pp. 3252 - 3258
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Michael E. McHenry

References

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