Yamamoto, Kei; Xu, M.*; Puebla, J.*; Otani, Yoshichika*; Maekawa, Sadamichi*
Journal of Magnetism and Magnetic Materials, 545, p.168672_1 - 168672_10, 2022/03
Yamane, Yuta*; Ieda, Junichi
Journal of Magnetism and Magnetic Materials, 491, p.165550_1 - 165550_5, 2019/12
Journal of Magnetism and Magnetic Materials, 479, p.88 - 90, 2019/06
Hiraka, Haruhiro*; Yano, Shinichiro*; Fukuda, Tatsuo
Journal of Magnetism and Magnetic Materials, 469, p.629 - 632, 2019/01
Ogata, Yudai; Chudo, Hiroyuki; Gu, B.; Kobayashi, Nobukiyo*; Ono, Masao; Harii, Kazuya; Matsuo, Mamoru; Saito, Eiji; Maekawa, Sadamichi
Journal of Magnetism and Magnetic Materials, 442, p.329 - 331, 2017/11
Journal of Magnetism and Magnetic Materials, 432, p.532 - 538, 2017/06
Agui, Akane; Masuda, Ryo*; Kobayashi, Yasuhiro*; Kato, Tadashi*; Emoto, Shun*; Suzuki, Kosuke*; Sakurai, Hiroshi*
Journal of Magnetism and Magnetic Materials, 408, p.41 - 45, 2016/06
We investigated the magnetization process of Fe (110) film using the field dependence of magnetic Compton scattering and Mssbauer spectroscopy. From the magnetic Compton profiles, the spin and orbital magnetic moment specific magnetization versus magnetizing field curves were obtained. From the Mssbauer spectra, the angles between the magnetizing field and the magnetic moment were obtained. It was found that the magnetizing field dependence of the ratio between orbital moment and spin moment was related to the angles between the magnetizing field and the magnetic moment. We indicate that the magnetic field dependence of the orbital magnetic moment plays a role in the magnetization process.
Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi
Journal of Magnetism and Magnetic Materials, 400, p.184 - 187, 2016/02
Journal of Magnetism and Magnetic Materials, 385, p.119 - 123, 2015/07
Kawasuso, Atsuo; Fukaya, Yuki; Maekawa, Masaki; Zhang, H.; Seki, Takeshi*; Yoshino, Tatsuro*; Saito, Eiji*; Takanashi, Koki*
Journal of Magnetism and Magnetic Materials, 342, p.139 - 143, 2013/09
Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 0.01 (1%).
Sakai, Seiji; Mitani, Seiji*; Matsumoto, Yoshihiro; Entani, Shiro; Avramov, P.; Otomo, Manabu; Naramoto, Hiroshi*; Takanashi, Koki
Journal of Magnetism and Magnetic Materials, 324(12), p.1970 - 1974, 2012/06
Agui, Akane; Asahi, Toru*; Sayama, Junichi*; Mizumaki, Masaichiro*; Tanaka, Masahito*; Osaka, Tetsuya*
Journal of Magnetism and Magnetic Materials, 320(22), p.3015 - 3018, 2008/11
no abstracts in English
Inami, Toshiya; Homma, Tetsuo*; Tsutsui, Satoshi*; Indo, Kentaro*; Onodera, Hideya*; Ishii, Kenji; Owada, Kenji; Kuzushita, Kaori*; Nakao, Hironori*; Murakami, Yoichi*
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.748 - 750, 2007/03
We investigated successive phase transitions in SmBC at =37K and =51K by means of resonant X-ray diffraction. Strong resonant diffraction signal is observed at the 101 reflection below at the Sm edge, whereas in the intermediate phase signals appear at incommensurate positions =(1, ,1) where =0.13. Accordingly, the successive phase transitions in SmBC is found to be commensurate-to-incommensurate magnetic phase transitions.
Ito, Shinichi*; Kajimoto, Ryoichi; Adams, M. A.*; Bull, M. J.*; Iwasa, Kazuaki*; Aso, Naofumi*; Yoshizawa, Hideki*; Takeuchi, Tetsuya*
Journal of Magnetism and Magnetic Materials, 310(2, Part2), p.1549 - 1551, 2007/03
We investigated static and dynamical properties in the three-dimensional percolating Heisenberg antiferromagnets, RbMnMgF, with the magnetic concentration close to the percolation threshold, , around the superlattice point well below . In neutron diffraction experiment, the wave number dependence of the elastic scattering component was well fitted to . Magnetic fractons were also studied using inelastic neutron scattering, and the observed fractons showed the dispersion relation of . The determined exponents, and , were in good agreement with the fractal dimension ().
Oishi, Kazuki; Heffner, R. H.; Morris, G. D.*; Fluss, M. J.*; Bauer, E. D.*; Morales, L. A.*; Sarrao, J. L.*; MacLaughlin, D. E.*; Shu, L.*; Ito, Takashi; et al.
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.566 - 568, 2007/03
no abstracts in English
Tokunaga, Yo; Aoki, Dai*; Homma, Yoshiya*; Kambe, Shinsaku; Sakai, Hironori; Ikeda, Shugo; Fujimoto, Tatsuya; Walstedt, R. E.*; Yasuoka, Hiroshi; Shiokawa, Yoshinobu*; et al.
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.735 - 737, 2007/03
In this paper, we present recent and detailed O-NMR results obtained in a single crystal. From the analysis of the field-angle dependence of the NMR spectrum,the appearance of a hyperfine interaction with field-induced antiferro-octupole (AFO) moment has been confirmed. This field-induced AFO moment appears as a result of the longitudinal triple- antiferro-quadrupole (AFQ) structure in the ordered state. We have also observed spin echo modulations caused by quadrupole interactions between the O nuclei and the Np-5f quadrupole moments. This reveals that the AFQ structure is directly observable by NMR. Our NMR results provide further insight into the microscopic nature of multipole phase transitions in f-electron systems.
Fujimoto, Tatsuya; Haga, Yoshinori; Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Onuki, Yoshichika*
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.746 - 747, 2007/03
UPd shows the successive quadrupole orders at K, K and K. The phase transition at comes from the (1/2,0,1/2)-type quadrupole orders on quasi-cubic uranium-sublattice. On the other hand, the quadrupole states below are still controversial; while the Polarized Neutron Diffraction suggested the triple- structure, the Resonant X-ray Scattering assumed the canted quadrupole order. In addition, below , an antiferromagnetic order has been suggested, but the magnetic structure and so on are not still identified. To investigate the local symmetry of the quadruple order in UPd, we tried the nuclear quadrupole resonance, and we succeeded to find the first spin-echo signals from the UPd probed by Pd nuclei. In this paper, we report the nuclear properties of Pd isotope and discuss the characteristics of the quadrupole orders emerging in each temperature phases.
Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Kato, Harukazu; Fujimoto, Tatsuya; Walstedt, R. E.*; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Aoki, Dai*; et al.
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.176 - 181, 2007/03
performed NMR measurements in 5f-115 compounds with various ground states [UFeGa (Paramagnet), UPtGa, NpCoGa, NpFeGa (Antiferromagnet) and PuRhGa (Superconductor)], and evaluated the T-dependence of the local (actinide site) magnetic fluctuation energies (//c and c) in the paramagnetic states. An anisotropy in the magnetic fluctuations is observed in all compounds due to the strong LS coupling, in contrast to 3d-high Tc cuprates which have isotropic magnetic fluctuations at Cu sites. It is remarkable that the XY-type magnetic anisotropy is strong in PuRhGa comparing with the non-superconducting 5f-115 compounds. The fluctuation energy in PuRhGa is of the order of 10meV which is between of heavy fermion superconductors (1meV for 1K) and high cuprates (102meV for 100K). The relation between the magnetic fluctuation properties and the ground states will be discussed.
Journal of Magnetism and Magnetic Materials, 310(2, Part2), p.e518 - e519, 2007/03
The Ising spin glass is investigated close to the spin glass transition temperature. Parisi's order parameter function and the de Almeida-Thouless (AT) line are obtained in various cluster approximations. A class of cluster approximations introduced by Baviera, Pasquini, and Serva, the Bethe approximation and cactus approximations are used to study effects of fluctuations on the replica symmetry breaking. Fluctuations seem to cause reduction in the slope of the order parameter function. The locus of the AT line for a cluster approximation changes from that for the Sherrington-Kirkpatrick (SK) model and the change seems to be affected by the existence of a loop in a cluster.
Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo; Yamamoto, Etsuji; Onuki, Yoshichika
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.422 - 424, 2007/03
We succeeded in growing a single crystal of UCuGe with the tetragonal crystal structure by the Sn-flux method and measured the temperature dependence of electrical resistivity, magnetization and magnetic susceptibility. UCuGe orders ferromagnetically below = 109 K. The magnetic properties are highly anisotropic. An easy-axis of the magnetization is found to be the  direction(c-axis), while the  direction (a-axis) corresponds to the hard-axis in magnetization, indicating Ising-type ferromagnetism. The saturation moment is determined as 1.75/U.