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The Nd-Fe-B/Mo/Fe-Co multilayered films on MgO(001) were fabricated by UHV sputtering method. The as-deposited films showed soft magnetic properties with weak perpendicular magnetic anisotropy, and after annealing above 650°C, these films showed in-plane magnetic anisotropy, good squareness, and hard magnetic properties with high coercivity of about 8 kOe. The (220) peak of Nd2Fe14B was identified in the XRD pattern after annealing of the film, which means that the c-axis, which is the easy axis of magnetization, points in the plane of the film, consistent with the measurement of the magnetization curve. The positive peak of ΔM plot of in-plane direction of the film annealed at 800°C was shown. This result suggests existence of exchange coupling between the Nd-Fe-B and Fe-Co layers in the in-plane anisotropic multilayered film with monoatomic Mo interlayer. [ABSTRACT FROM AUTHOR]

In FePt(10 nm)-FeRh(25 nm), a large reduction of coercive field in the FePt layer occurs at a temperature just above the antiferro-ferromagnetic transition temperature of FeRh, which is attributable to the existence of an exchange spring mechanism. FePt(10 nm)-FeRh(7.5 nm) film does not show coercivity reduction due to the magnetic transition because of a high nucleation field for magnetization twisting of FeRh layer. The coercive field of the FePt layer is largely enhanced by field annealing. [ABSTRACT FROM AUTHOR]