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L1_{0} FePt/Fe Exchange Coupled Composite Structure on MgO Substrates

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6 Author(s)
Ma, Bin ; Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA ; Hao Wang ; Haibao Zhao ; Sun, Chengjun
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A core-shell type exchange-coupled composite (ECC) structure is developed with an L10 phase FePt core and an Fe shell. Coercivity decreases from 30.6 kOe for the FePt granular film with a very thin thickness of 3.2 nm, to 7.85 kOe for the FePt/Fe core-shell type granular film with a 3-nm-thick Fe. The energy barriers of the FePt/Fe films are measured by using Sharrock equation. A modified formula of gain factor considering the effect of films' thickness is proposed. Core-shell type FePt/Fe ECC granular film has a large advantage over a conventional granular film for media application.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 6 )