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Barium hexaferrite BaFe12O19 is ferrimagnetic and has the strong uniaxial magnetic anisotropy. Substitution of some Fe ions by nonmagnetic ions results the reduction of the axial anisotropy along the c axis and it makes the substituted Barium-ferrite an attractive material. Our group has reported in the previous paper that we succeeded to observe a magnetic satellite reflection of BaCoTiFe10O19 at Fe K edge [1]. The observation verified that the Fe K edge can excite resonantly but indirectly the 3d state of iron and the magnetic resonant enhancement is sufficiently large to study the magnetic order of Fe compounds. In this study we have investigated the magnetic anisotropy change due to the substitution of BaCoTiFe10O19 by XMCD and RXMS method at Fe K edge. RXMS experiments were carried out at the BL-3A/6C of Photon Factory. X-rays were circularly-polarized by a transmitted-type phase retarder. Diffraction profiles were measured at wavelengths of λ = 1.7406 and 1.7390 Å. Low-temperature experiments at T = 100 K were performed with the Oxford Cryostream Cooler. The magnetic structure can be determined based on the difference between observed and calculated asymmetry ratios. The observed asymmetrical ratio ΔRobs was obtained for 32 Bragg reflections through the RXMS measurements. The ΔRcalc was estimated from the crystal structure factors related to charge, anomalous, magnetic and resonant magnetic scattering terms, based on the structural model. The canting angles of spins were estimated with residual factors of Σ(ΔRobs ΔRcalc). The noncollinear spin structure of BaCoTiFe10O19 and magnetic anisotropy change due to the substitution will be disscussed. [1]Ohsawa et al., AIP Conf. Proc., 879, 1715-1722 (2007)

Evidence of heterogeneous nucleation of Nd2Fe14B upon crystallisation of Nd–Fe–B melt-spun ribbons

Evidence of heterogeneous nucleation of Nd₂Fe₁₄B upon crystallisation of Nd–Fe–B melt-spun ribbons