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Papers by Author: Hiromichi Adachi

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A Study of Spin and Orbital Magnetic Form Factors of CeRh₃B₂ by X-Ray Magnetic Diffraction

Authors: Masahisa Ito, Ryota Nagayasu, Tatsuki Tadenuma, Kosuke Suzuki, Ayako Sato, Hiromichi Adachi, Yoshiharu Sakurai, Yoshichika Ōnuki

Abstract: An experimental method of X-ray magnetic diffraction was applied to the ferromagnetic rare-earth compound CeRh₃B₂, and its spin and orbital magnetic form factors were measured independently for the first time. Our curve-fitting analysis shows that the orbital magnetic form factor is reproduced by the calculated atomic-model form factor of Ce-4f electrons under the dipole approximation. The comparison of the sum of form factors and the total magnetic form factor measured by the polarized neutron diffraction reveals anisotropic distribution of the magnetic moment in real space.

Spin Density Distribution of YTiO₃ Observed by X-Ray Magnetic Diffraction

Authors: Kosuke Suzuki, Masahisa Ito, Naruki Tsuji, Hiromichi Adachi, Hironori Nakao, Youichi Murakami, Yasujiro Taguchi, Yoshinori Tokura, Eiji Nishibori, Makoto Sakata

Abstract: An　X-ray magnetic diffraction (XMD) is applied to ferromagnetic transition metal oxide YTiO₃. The spin magnetic form factors are measured for 81 reciprocal lattice points of h0l, hk0 and 0kl series. Three-dimensional spin density distribution in the real space of YTiO₃ is successfully obtained by using Maximum Entropy Method (MEM). This is the first result of spin density in the real space by the XMD.

Spin and Orbital Magnetic Moment of Pd₃Co Evaluated by X-Ray Magnetic Diffraction Experiment

Authors: Masahisa Ito, Yoshiaki Oba, Ayako Sato, Kosuke Suzuki, Tatsuki Tadenuma, Ryota Nagayasu, Hiroshi Sakurai, Hiromichi Adachi

Abstract: We have measured spin and orbital magnetic form factors of Pd3Co for various reciprocal lattice points by the X-ray magnetic diffraction. Observed spin and orbital magnetic form factors are fitted by theoretical curves of the isolated atomic model under the dipole approximation. By the fitting analysis we have evaluated separately the spin and orbital component of the magnetic moment of Pd3Co alloy as 2.19 µB/f.u. and 0.83 µB/f.u., respectively. The total magnetic moment 3.02 µB/f.u. is comparable to the value of 2.93 µB/f.u. obtained by the magnetization measurement.