Anomalous electrical magnetochiral effect by chiral spin fluctuation

Abstract

The non-collinear spin configurations cause many nontrivial phenomena related to the Berry phase. They are described by the vector spin chirality ${\chi }_{ij}={\mathbf{S}}_i\times {\mathbf{S}}_j$ or scalar spin chirality ${\chi }_{ijk}=({\mathbf{S}}_i\times {\mathbf{S}}_j)\cdot {\mathbf{S}}_k$, which are related to the spin current and effective magnetic field, respectively. The scalar spin chirality leads to the topological Hall effect in metals, while the vector spin chirality to the ferroelectricity of spin origin, i.e., multiferroics in insulators. However, the role of the vector spin chirality in conducting systems has not yet elucidated. Here we show theoretically that the spin fluctuation with vector spin chirality in chiral magnets scatters electrons asymmetrically, resulting in a nonreciprocal transport phenomena, i.e., electrical magnetochiral effect (eMChE). This asymmetric scattering appears in the leading-order scattering term, implying a large nonreciprocity in the charge and spin currents. We find that the temperature and magnetic field dependence of the eMChE reproduces that observed in MnSi. Our results reveal the microscopic mechanism of eMChE and its potential in producing a large nonreciprocal response.

6 pages, 2 figures

References in corpus (6)

• Spin current and magneto-electric effect in non-collinear magnets
• Spontaneous Skyrmion Ground States in Magnetic Metals
• Electronic Orbital Currents and Polarization in Mott Insulators
• A hidden constant in the anomalous Hall effect of a high-purity magnet MnSi
• Noncommutative quantum mechanics and skew scattering in ferromagnetic metals
• Spin-current diode with a monoaxial chiral magnet

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