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Spin phase detection by spin current in a chiral helimagnet
Nan Jiang, Shota Suzuki, Issei Sasaki +9
Helimagnets, characterized by a helical arrangement of magnetic moments, possess unique internal degrees of freedom, including the spin phase, defined by the phase of the helical m…
Quantitative imaging of nonlinear spin-wave propagation using diamond quantum sensors
Kensuke Ogawa, Moeta Tsukamoto, Yusuke Mori +7
Spin waves propagating in magnetic materials exhibit nonlinear behavior at large amplitudes due to the competition between excitation and relaxation, providing an attractive platfo…
Topological spin Hall effect in antiferromagnets driven by vector Néel chirality
Kazuki Nakazawa, Koujiro Hoshi, Jotaro J. Nakane +2
Spin Hall effect of spin-texture origin is explored theoretically for antiferromagnetic (AF) metals. It is found that a vector chirality formed by the Néel vector gives rise to a t…
Chirality-dependent spin current generation in a helimagnet: zero-field probe of chirality
Hidetoshi Masuda, Takeshi Seki, Jun-ichiro Ohe +3
In a magnetic texture, the spin of a conduction electron is forced to be aligned to the localized moment. As a result, the topology of the magnetic texture affects the electron dyn…
Half-mirror for electrons on quantum Hall copropagating edge channels
Takase Shimizu, Jun-ichiro Ohe, Akira Endo +2
A half-mirror that divides a spin-polarized electron into two parallel copropagating spin-resolved quantum Hall edge channels one half each is presented in this study. The partitio…
Generation of Spin Currents in the Skyrmion Phase of a Helimagnetic Insulator
Daichi Hirobe, Yuki Shiomi, Yuhki Shimada +2
We report spin-current generation related with skyrmion dynamics resonantly excited by a microwave in a helimagnetic insulator . A Pt layer was fabricated on $…
Magnetostatic wave analog of integer quantum Hall state in patterned magnetic films
Ryuichi Shindou, Jun-ichiro Ohe
A magnetostatic spin wave analog of integer quantum Hall (IQH) state is proposed in realistic patterned ferromagnetic thin films. Due to magnetic shape anisotropy, magnetic moments…
Chiral spin-wave edge modes in dipolar magnetic thin films
Ryuichi Shindou, Jun-ichiro Ohe, Ryo Matsumoto +2
Based on a linearized Landau-Lifshitz equation, we show that two-dimensional periodic allay of ferromagnetic particles coupled with magnetic dipole-dipole interactions supports chi…
Topological chiral magnonic edge mode in a magnonic crystal
Ryuichi Shindou, Ryo Matsumoto, Shuichi Murakami +1
Topological phases have been explored in various fields in physics such as spintronics, photonics, liquid helium, correlated electron system and cold-atomic system. This leads to t…
Ultrafast magnetic vortex core switching driven by topological inverse Faraday effect
Katsuhisa Taguchi, Jun-ichiro Ohe, Gen Tatara
We present a theoretical discovery of an unconventional mechanism of inverse Faraday effect (IFE) which acts selectively on topological magnetic structures. The effect, topological…
Continuous Generation of Spinmotive Force in a Patterned Ferromagnetic Film
Yuta Yamane, Kohei Sasage, Toshu An +6
We study, both experimentally and theoretically, the generation of a dc spinmotive force. By exciting a ferromagnetic resonance of a comb-shaped ferromagnetic thin film, a continuo…
Equation-of-motion approach of spin-motive force
Yuta Yamane, Jun'ichi Ieda, Jun-ichiro Ohe +2
We formulate a quantitative theory of an electromotive force of spin origin, i.e., spin-motive force, by the equation-of-motion approach. In a ferromagnetic metal, electrons couple…
Gigantic enhancement of spin Seebeck effect by phonon drag
Hiroto Adachi, Ken-ichi Uchida, Eiji Saitoh +3
We investigate both theoretically and experimentally a gigantic enhancement of the spin Seebeck effect in a prototypical magnet LaYFeO at low temperatures. Our theor…
Linear-response theory of spin Seebeck effect in ferromagnetic insulators
Hiroto Adachi, Jun-ichiro Ohe, Saburo Takahashi +1
We formulate a linear response theory of the spin Seebeck effect, i.e., a spin voltage generation from heat current flowing in a ferromagnet. Our approach focuses on the collective…
Charge current driven by spin dynamics in disordered Rashba spin-orbit system
Jun-ichiro Ohe, Akihito Takeuchi, Gen Tatara
Pumping of charge current by spin dynamics in the presence of the Rashba spin-orbit interaction is theoretically studied. Considering disordered electron, the exchange coupling and…
Mesoscopic Hall effect driven by chiral spin order
Jun-ichiro Ohe, Tomi Ohtsuki, Bernhard Kramer
A Hall effect due to spin chirality in mesoscopic systems is predicted. We consider a 4-terminal Hall system including local spins with geometry of a vortex domain wall, where stro…
Dynamics of a domain wall and spin-wave excitations driven by a mesoscopic current
Jun-ichiro Ohe, Bernhard Kramer
The dynamics of a domain wall driven by a spin-polarized current in a mesoscopic system is studied numerically. Spin-mixing in the states of the conduction electrons is fully taken…
Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction
Jun-ichiro Ohe, Masayuki Yamamoto, Tomi Ohtsuki +1
A novel spin filtering in two-dimensional electron system with nonuniform spin-orbit interactions (SOI) is theoretically studied. The strength of SOI is modulated perpendicular to…
Conductance fluctuations in the presence of spin scattering
J. Ohe, M. Yamamoto, T. Ohtsuki
Electron transport through disordered systems that include spin scatterers is studied numerically. We consider three kinds of magnetic impurities: the Ising, the XY and the Heisenb…