Abstract
In order to study the origin of high coercivity in a Co–Pt film deposited on an Ru underlayer we used a single-crystal MgO substrate to simplify the measurement of magnetic properties and transmission electron microscopy. The structure of the Ru layer on single-crystal MgO (110) is twin. MgO [001] and the c axes of Ru grains are arranged at an angle of about 60°. The Co–Pt layer grows epitaxially on the Ru layer. Although the initial Co–Pt layer is mostly a hcp structure, fcc structure grains are growing at the upper surface through the boundary of hcp grains. The MgO [001] direction is magnetically easy and the MgO [1-10] direction is normally hard axis. The anisotropy field increases when an Ru underlayer is used in the Pt-rich composition. Coercivity is enhanced by the increase in magnetic anisotropy originating from the hcp-Co–Pt alloy that is stabilized even in the Pt-rich composition by using the hcp-Ru underlayer. The Ru layer deposited at a high gas pressure forms a columnar structure, which is effective as well as hcp-Co–Pt with high magnetic anisotropy in the enhancement of coercivity.
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