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Ieda, Junichi
Nihon Juki Gakkai Kenkyukai Shiryo, 250, p.1 - 5, 2024/10
no abstracts in English
Yamane, Yuta*; Fukami, Shunsuke*; Ieda, Junichi
Physical Review Letters, 128(14), p.147201_1 - 147201_6, 2022/04
Times Cited Count：9 Percentile：71.27(Physics, Multidisciplinary)We extend the theory of emergent inductance, which has recently been discovered in spiral magnets, to arbitrary magnetic textures by taking into account spin-orbit couplings arising in the absence of spatial inversion symmetry. We propose a new concept of spin-orbit emergent inductance, which can be formulated as originating from a dynamical Aharonov-Casher phase of an electron in ferromagnets. The spin-orbit emergent inductance universally arises in the coexistence of magnetism and the spin-orbit couplings, even with spatially uniform magnetization, allowing its stable operation in wide ranges of temperature and frequency. Revisiting the widely studied systems involving ferromagnets with spatial inversion asymmetry, with the new perspective offered by our work, will lead to opening a new paradigm in the study of spin-orbit physics and the spintronics-based power management in ultrawideband frequency range.
Funato, Takumi*; Matsuo, Mamoru
Physical Review Letters, 128(7), p.077201_1 - 077201_6, 2022/02
Times Cited Count：6 Percentile：59.84(Physics, Multidisciplinary)Ieda, Junichi; Yamane, Yuta*
Physical Review B, 103(10), p.L100402_1 - L100402_5, 2021/03
Times Cited Count：19 Percentile：76.61(Materials Science, Multidisciplinary)Yamane, Yuta*; Ieda, Junichi
Journal of Magnetism and Magnetic Materials, 491, p.165550_1 - 165550_5, 2019/12
Times Cited Count：7 Percentile：30.98(Materials Science, Multidisciplinary)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：7 Percentile：31.53(Materials Science, Multidisciplinary)Ieda, Junichi; Maekawa, Sadamichi
Spin Current (2nd Edition), p.69 - 92, 2017/11
Times Cited Count：0 Percentile：0.00(Engineering, Electrical & Electronic)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.
家田 淳一
山根 結太*; 深見 俊輔*
JP, 2021-030176 
Patent licensing information Patent publication (In Japanese)
【課題】 材料を選ぶ困難性が然程には高くなく、かつ、温度依存性も然程に高くない新しいタイプの創発電磁場を利用した薄膜インダクタ素子を提供することを目的とする。 【解決手段】 磁性体層と、非磁性体層又は反強磁性体層と、が積層された積層膜と、一対の電極を備え、 前記磁性体層と前記非磁性体層又は前記反強磁性体層は、積層方向と直交する方向で任意の形状で延伸され、かつ、前記積層方向の上下向きも任意であり、前記磁性体層は、略一様な磁化構造を有しており、前記一対の電極は、前記積層膜が延伸される両端に設けられ、交流電流ないしは高周波電流が印加されることを特徴とする薄膜インダクタ素子
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 
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.
Ieda, Junichi; Yamane, Yuta*
no journal, ,
no abstracts in English
Ieda, Junichi; Yamane, Yuta*
no journal, ,
no abstracts in English
Ieda, Junichi
no journal, ,
no abstracts in English
Ieda, Junichi; Araki, Yasufumi; Yamane, Yuta*
no journal, ,
no abstracts in English
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.
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.
Ieda, Junichi; Yamane, Yuta*
no journal, ,
