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論文

スキルミオン; 60年の進展

岡 眞

日本物理学会誌, 75(10), p.608 - 609, 2020/10

スキルミオンとその歴史に関して、「現代物理のキーワード」欄に解説する。

論文

Magnetic field induced triple-$$q$$ magnetic order in trillium lattice antiferromagnet EuPtSi studied by resonant X-ray scattering

田端 千紘*; 松村 武*; 中尾 裕則*; 道村 真司*; 垣花 将司*; 稲見 俊哉*; 金子 耕士; 辺土 正人*; 仲間 隆男*; 大貫 惇睦*

Journal of the Physical Society of Japan, 88(9), p.093704_1 - 093704_5, 2019/09

 被引用回数:4 パーセンタイル:25.43(Physics, Multidisciplinary)

The magnetic order in the magnetic-fild-induced so-called A phase of cubic chiral antiferromagnet EuPtSi was investigated by resonant X-ray scattering (RXS) near the Eu $$L_{2}$$ edge. The high flux RXS signal under the magnetic field applied along [111] revealed the first and second order satellite magnetic reflections, indicating that the A phase is a triple-$$q$$ magnetic ordered state that is described by three propagation vectors lying in the plane normal to the magnetic field direction; $$q_1$$, $$q_2$$, and $$q_3$$. With the high resolution in the reciprocal space achieved in the RXS measurement, it is suggested that the triple-$$q$$ order strongly couples with the underlying crystal lattice. The triple-$$q$$ magnetic order is discussed in the context of a magnetic skyrmion lattice on which the geometrical frustration may play a crucial role.

口頭

Effects of spin-orbit couplings on emergent electric fields due to magnetic Skyrmion motion

家田 淳一; 山根 結太*

no journal, , 

We present an analytical study on the spinmotive force (SMF) generated by translational motion of magnetic Skyrmion. A SMF refers to an electrical voltage emerged due to dynamical magnetic textures, which reflects the spatiotemporal variation of the magnetization. The dynamics of a Skyrmion thus can be detected by a SMF measurement, which may play an important role in future Skyrmion-based technologies. We obtain the expression for the SMF, taking into account the Rashba and Dresselhaus spin-orbit couplings (SOCs) as well as the so-called $$beta$$ term arising from the nonadiabaticity in the electron spin dynamics. To this end, we derive a general formula for the SMF including the effect of the Dresselhaus SOC. Our results reveal the dependence of the SMF on the Skyrmion profile and the SOC parameters, which offers an estimation of the SMF for a given experiment.

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