Structural and magnetic properties of rapidly quenched (Sm,R)(Fe,Co)11.4Ti0.6 (R = Y, Zr) with ThMn12 structure

The structural and magnetic properties of (Sm0.8R0.2)(Fe0.8Co0.2)11.4Ti0.6 (R = Y, Zr) prepared by rapid quenching are investigated focusing on the differences between the Y- and Zr-substituted alloys. An almost single phase with ThMn12 structure was obtained for both cases of R = Y and Zr. The μ0Ms of (Sm0.8Y0.2)(Fe0.8Co0.2)11.4Ti0.6 determined from the magnetization curve was 1.52 T, whereas that for (Sm0.8Zr0.2)(Fe0.8Co0.2)11.4Ti0.6 was 1.46 T. To clarify the difference in magnetic properties between the samples, hyperfine splitting was measured by Mössbauer spectroscopy and it was found that the magnetic moment of the Y-substituted alloy was larger than that of the Zr-substituted alloy in all three Fe sites, and this result was consistent with the difference in μ0Ms obtained by magnetization measurement.