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Effect of microstructures on exchange anisotropy in Mn-Ir/Ni-Fe exchange-biased mutilayers with various stacking structures

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4 Author(s)
Jae-Chul Ro ; Dept. of Metall. Eng., SungKyunKwan Univ., Suwon, South Korea ; Young-Suk Choi ; Su-Jung Suh ; Hwack-Joo Lee

The magnetic properties and the microstructures of the Mn-Ir/Ni-Fe multilayers with various stacking structures and buffer layer materials have been investigated. The (111) texture of Mn-Ir/Ni-Fe is obtained in the top structures with Ta or Zr buffer. However, all mutilayers which contain Mn-Ir films deposited on Ni-Fe films exhibit high Hex, regardless of the (111) preferred orientation of Mn-Ir film. The TS multilayers which show high Hex have large Mn-Ir grains at the interface, compared with BS multilayers without exchange anisotropy. The multilayers which reveal the exchange anisotropy also have the grain-to-grain epitaxial tendency at the interface of Mn-Ir/Ni-Fe. It is concluded that the Hex is not related to the (111) texture of the Mn-Ir film, but related to the grain size of the Mn-Ir film and the morphology at the interface between the Mn-Ir and the Ni-Fe grains

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IEEE Transactions on Magnetics  (Volume:35 ,  Issue: 5 )