Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Exchange Coupling in NiFe/Ni Bilayer Fabricated By Electrodeposition

  • Kim, D.Y. (Physics Department, Andong National University) ;
  • Jeon, S.J. (Physics Department, Andong National University) ;
  • Kim, K.W. (Physics Department, Andong National University) ;
  • Yoon, S.S. (Physics Department, Andong National University)
  • Received : 2011.02.14
  • Accepted : 2011.04.01
  • Published : 2011.06.30
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Abstract

Bilayers of soft NiFe (150 nm-420 nm) on hard Ni (150 nm) were prepared by electrodeposition. The process of magnetization reversal in the NiFe/Ni bilayers was then investigated. The hysteresis loop generated by a magnetization reversal of soft NiFe under a positive saturation state of a hard Ni layer shows a shift along the negative field axis, which is clear evidence for the exchange spring effect in the NiFe/Ni bilayers. The dependence of the coercive field $H_c$ and exchange bias field Hex on the thickness of the NiFe layer was also investigated. As the NiFe thickness increases from 150 nm to 420 nm, both $H_c$ and $H_{ex}$ decrease rapidly from $H_c$= 51.7 Oe and $H_{ex}$ = 12.2 Oe, and saturate to $H_c$ = 5.8 Oe and $H_{ex}$ = 3.5 Oe.

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