Abstract
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.
Highlights
The exchange coupled hard/soft nanocomposite magnet is expected to have a large maximum energy product (BH)max.1,2 This theoretical predictions have been demonstrated in a multilayered films, the Sm-Co/(α–Fe or Fe-Co)3,4 systems
We report on the formation of Nd-Fe-B/Mo/FeCo nanocomposite film magnets with in-plane magnetic anisotropy, their magnetic properties, and magnetic exchange coupling
Dependence of average surface roughness (Ra) and peak to valley (P–V) from analyzed atomic force microscopy (AFM) images of the films on the post-annealing temperatures are shown in Fig. 1(c) and 1(d)
Summary
The exchange coupled hard/soft nanocomposite magnet is expected to have a large maximum energy product (BH)max. This theoretical predictions have been demonstrated in a multilayered films, the Sm-Co/(α–Fe or Fe-Co) systems. We reported that Nd2Fe14B/Mo/α-Fe multilayers with Mo (1 nm thick) interlayer prepared by a two-step method, which consists of a combination of low-temperature sputtering and postannealing, showed a united demagnetization curve without large steps due to decoupling, and exhibited hard magnetism with a coercive force of about 7 kOe.. We reported that Nd2Fe14B/Mo/α-Fe multilayers with Mo (1 nm thick) interlayer prepared by a two-step method, which consists of a combination of low-temperature sputtering and postannealing, showed a united demagnetization curve without large steps due to decoupling, and exhibited hard magnetism with a coercive force of about 7 kOe.11 In these reports, it was shown that the insertion of Ta or Mo as an intermediate layer between the hard and soft magnetic layers is effective in maintaining the stacked structure by suppressing the atomic diffusion between the layers during the deposition of the stacked film on a heated substrate or during post-annealing.. The development of highperformance Nd2Fe14B/(α-Fe or Fe-Co) nanocomposite film magnet with in-plane magnetic anisotropy (IMA) has been awaited
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