Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism

Okabayashi, Jun*; Suzuki, Kazuya; Mizukami, Shigemi*

Journal of Magnetism and Magnetic Materials, 564, Part2, p.170163_1 - 170163_5, 2022/12

https://doi.org/10.1016/j.jmmm.2022.170163

The magnetic atom diffusion at the interface between CoMn alloy and MnGa layer with annealing is studied using X-ray magnetic circular dichroism (XMCD) analysis. We found that the spins in bcc CoMn are coupled parallel to those in perpendicularly magnetized MnGa layer under the as-grown conditions, while the post annealing modulates the interfacial magnetic coupling to antiferromagnetic in Co. The elementspecific hysteresis curves at each absorption edge revealed the large coercive fields in Mn and Co through the exchange coupling with MnGa. After the annealing process, the changes of XMCD spectral line shapes are related to the interfacial reactions promoting the formation of Mn and CoMnGa layers, which is deduced from the analysis oftransmission electron microscopy. The interfacial diffusion of Mn atoms modulates the magnetic exchange coupling between Mn and Co sites and reverses the direction of perpendicular magnetization.

Holographic dual approach to magnetism and magnetization dynamics

Yokoi, Naoto*; Saito, Eiji

Journal of Magnetism and Magnetic Materials, 545, p.168673_1 - 168673_12, 2022/03

https://doi.org/10.1016/j.jmmm.2021.168673

Crystalline dependence of spin transmission in CrO thin films

Qin, J.*; Hou, D.*; Chen, Y.*; Saito, Eiji; Jin, X.*

Journal of Magnetism and Magnetic Materials, 501, p.166362_1 - 166362_4, 2020/05

https://doi.org/10.1016/j.jmmm.2019.166362

Magnetic excitations and transport properties in frustrated ferromagnetic chain

Onishi, Hiroaki

Journal of Magnetism and Magnetic Materials, 479, p.88 - 90, 2019/06

https://doi.org/10.1016/j.jmmm.2019.02.006

Invariant incommensurate coherence length in spin-density-wave excitation of CrFe

Hiraka, Haruhiro*; Yano, Shinichiro*; Fukuda, Tatsuo

Journal of Magnetism and Magnetic Materials, 469, p.629 - 632, 2019/01

https://doi.org/10.1016/j.jmmm.2018.09.035

Three-dimensional magnetic domain structure in a model with exchange randomness

Yokota, Terufumi

Journal of Magnetism and Magnetic Materials, 432, p.532 - 538, 2017/06

https://doi.org/10.1016/j.jmmm.2017.02.031

What determines the sign of the spin Hall effects in Cu alloys doped with 5d elements?

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Magnetism and Magnetic Materials, 400, p.184 - 187, 2016/02

https://doi.org/10.1016/j.jmmm.2015.08.073

Current-induced spin polarization on a Pt surface; A New approach using spin-polarized positron annihilation spectroscopy

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

https://doi.org/10.1016/j.jmmm.2013.04.006

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%).

Magnetic circular dichroism of [Co/Pd] and [CoB/Pd] multilayered films

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

https://doi.org/10.1016/j.jmmm.2008.08.011

no abstracts in English

Fractal dimension in percolating Heisenberg antiferromagnets

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 ().