Ru下地を用いたCo-Pt膜の構造と磁気特性 : 磁気記録媒体

概要

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To study the origin of high coercivity in Co-Pt film with an Ru underlayer, we measured the magnetic properties and performed transmission electron microscopy (TEM) observation of Co-Pt films deposited on single-crystal MgO. The structure of the Ru layer is twin. MgO [100] and the c-axes of Ru are arranged at an angle of about 60 degrees. Although most of the Co-Pt grains on the Ru have an hcp structure, an fcc structure can be observed at the upper surface of the grain-boundary region. The MgO [100] and [110] directions are normally magnetically easy and hard, respectively. The anisotropy field increases when an Ru underlayer is used in the Pt-rich region. Coercivity is enhanced by the increase in magnetic anisotropy originating from the hcp Co-Pt alloy, which is stabilized even in a Pt-rich composition by using the hcp-Ru underlayer.
2002-04-01