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Journal Articles

Skyrmion-generated spinmotive forces in inversion broken ferromagnets

Yamane, Yuta*; Ieda, Junichi

Journal of Magnetism and Magnetic Materials, 491, p.165550_1 - 165550_5, 2019/12

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

Journal Articles

Spinmotive force in the out-of-plane direction generated by spin wave excitations in an exchange-coupled bilayer element

Zhou, W.*; Seki, Takeshi*; Imamura, Hiroshi*; Ieda, Junichi; Takanashi, Koki*

Physical Review B, 100(9), p.094424_1 - 094424_5, 2019/09

 Times Cited Count:1 Percentile:79.37(Materials Science, Multidisciplinary)

Journal Articles

Spinmotive force

Ieda, Junichi; Maekawa, Sadamichi

Spin Current (2nd Edition), p.69 - 92, 2017/11

 Times Cited Count:0 Percentile:100

This chapter reviews spinmotive force (SMF), which is an emerging concept that is responsible for generating spin current and electric voltage in magnetic conductors. The SMF is induced in magnetic nanostructures via the exchange interaction between conduction spin and magnetization. Various types of the spin electric fields are found: adiabatic, nonadiabatic, and their spin-orbit coupled equivalents. In experiment, the adiabatic contributions with/without spin-orbit coupling have been observed whereas detecting nonadiabatic effects is challenging. The SMF offers electrical detection of magnetization dynamics, which would allow us to monitor the elusive dynamics of antiferromagnets.

Oral presentation

Spinmotive force due to motion of magnetic bubble arrays driven by magnetic field gradient

Ieda, Junichi; Yamane, Yuta*; Hemmatiyan, S.*; Sinova, J.*; Maekawa, Sadamichi

no journal, , 

We show that electric voltage generation (spinmotive force) from magnetic bubble arrays subject to a magnetic field gradient. The formula for the induced voltage is derived and whereby a new method is proposed for determining the magnitude of the phenomenological parameter $$beta$$ that measures non-adiabaticity of current-induced magnetization dynamics. This spinmotive force opens up a door for developing a new type of spintronics devices relying on the magnetic field gradient.

Oral presentation

Spin transport in metallic antiferromagnetic textures; Interplay of inter-sublattice mixing and s-d exchange interaction

Ieda, Junichi; Yamane, Yuta*; Sinova, J.*

no journal, , 

Recently, antiferromagnetic (AFM) materials are generating more attention due to their potential to become a key player in technological applications. To understand spin transport in AFM metals, however, in addition to the s-d exchange interaction that plays a pivotal role in ferromagnetic-based spintronics, the sublattice degree of freedom should be taken into account. In this presentation we theoretically demonstrate electric voltage generation due to spinmotive forces originating from domain wall motion and magnetic resonance in antiferromagnets. This work suggests a new way to observe and explore the dynamics of antiferromagnetic textures by electrical means, an important aspect in the emerging field of antiferromagnetic spintronics. We also formulate spin-transfer torques in antiferromagnetic materials. Taking in the electron-magnetization exchange coupling and the inter-sublattice electron dynamic as model parameters, we examine the two limiting cases where either one of the two is dominant over another. Our work offers a framework for quantitative understanding of spin-transfer torques in different classes of antiferromagnetic materials.

Oral presentation

Spintronic micro-power generation

Ieda, Junichi

no journal, , 

Spintronics aims to harness both charge and spin degrees of freedom of electrons in condensed matter systems and opens fascinating new perspectives for both basic research and device technology. Cooperation of the spin-orbit interaction with the exchange interaction between the conduction electron spins and localized moment gives rise to a variety of phenomena that generate, control, and detect spin currents. In this talk, we present our contributions to developing new ways of micro-power generation based on spin currents, i.e., the spinmotive force, spin Seebeck effect, and spin hydrodynamic generation.

Oral presentation

Oral presentation

Spin-energy conversion via emergent electromagnetic fields

Ieda, Junichi; Yamane, Yuta*; Maekawa, Sadamichi

no journal, , 

Oral presentation

Spin-orbit coupled emergent inductor

Ieda, Junichi; Yamane, Yuta*

no journal, , 

no abstracts in English

Oral presentation

Spinmotive forces emerging in magnetic nanostructures and its applications

Ieda, Junichi

no journal, , 

no abstracts in English

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