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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

Spin torques and electrical voltage generation in antiferromagnetic nanotextures

Yamane, Yuta*; Ieda, Junichi

Magune, 13(5), p.235 - 241, 2018/10

Journal Articles

Spin-transfer torques in antiferromagnetic textures; Efficiency and quantification method

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

Physical Review B, 94(5), p.054409_1 - 054409_8, 2016/08

AA2016-0164.pdf:0.5MB

 Times Cited Count:16 Percentile:25.16(Materials Science, Multidisciplinary)

We formulate a theory of spin-transfer torques in antiferromagnets, which covers the small to large limits of the exchange coupling energy relative to the kinetic energy of the inter-sublattice electron dynamics. Our theory suggests a natural definition of the efficiency of spin-transfer torques in antiferromagnets in terms of well-defined material parameters, revealing that the charge current couples predominantly to the antiferromagnetic order parameter and the sublattice-canting moment in, respectively, the limits of large and small exchange coupling. The effects can be quantified by analyzing the antiferromagnetic spin-wave dispersions in the presence of charge current: in the limit of large exchange coupling the spin-wave Doppler shift always occurs, whereas, in the opposite limit, the only spin-wave modes to react to the charge current are ones that carry a pronounced sublattice-canting moment. The findings offer a framework for understanding and designing spin-transfer torques in antiferromagnets belonging to different classes of sublattice structures such as, e.g., bipartite and layered antiferromagnets.

Journal Articles

Electric voltage generation by antiferromagnetic dynamics

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

Physical Review B, 93(18), p.180408_1 - 180408_5, 2016/05

 Times Cited Count:13 Percentile:33.62(Materials Science, Multidisciplinary)

Journal Articles

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

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

Scientific Reports (Internet), 4, p.6901_1 - 6901_5, 2014/11

 Times Cited Count:10 Percentile:48.69(Multidisciplinary Sciences)

Interaction between local magnetization and conduction electrons is responsible for a variety of phenomena in magnetic materials. It has been recently shown that spin current and associated electric voltage can be induced by magnetization that depends on both time and space. This effect, called spinmotive force, provides for a powerful tool for exploring the dynamics and the nature of magnetic textures, as well as a new source for electromotive force. Here we theoretically demonstrate the generation of electric voltages in magnetic bubble array systems subjected to a magnetic field gradient. It is shown by deriving expressions for the electric voltages that the present system offers a direct measure of phenomenological parameter $$beta$$ that describes non-adiabaticity in the current induced magnetization dynamics. This spinmotive force opens a door for new types of spintronic devices that exploit the field-gradient.

Journal Articles

Spinmotive force with static and uniform magnetization induced by a time-varying electric field

Yamane, Yuta; Ieda, Junichi; Maekawa, Sadamichi

Physical Review B, 88(1), p.014430_1 - 014430_4, 2013/07

 Times Cited Count:11 Percentile:46.03(Materials Science, Multidisciplinary)

Journal Articles

Real-time analysis of the spinmotive force due to domain wall motion

Ieda, Junichi; Maekawa, Sadamichi; Yamane, Yuta

Journal of the Korean Physical Society, 62(12), p.1802 - 1806, 2013/06

 Times Cited Count:2 Percentile:76.4(Physics, Multidisciplinary)

Spinmotive force, which is induced by motion of a nonuniform magnetic nanostructure, reflects real time dynamics of the magnetization texture. Using numerical simulations we study the spinmotive force associated with domain wall motion and find that its dc component scales with an applied magnetic field even in a field range where the wall motion is no longer associated with periodic angular rotation of the wall magnetization. As the field is increased, spikes in the voltage signals start to appear, which are mainly associated with vortex core nucleation and annihilation. At high fields, the slope of the generated dc voltage with the applied field is expected to be only dependent on the spin polarization of conduction electrons and thus can be used to accurately determine the degree of spin polarization in various materials.

Journal Articles

Spinmotive force in magnetic nanostructures

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

SPIN, 3(2), p.1330004_1 - 1330004_15, 2013/06

 Times Cited Count:4 Percentile:86.1(Physics, Applied)

Journal Articles

Stability of spinmotive force in perpendicularly magnetized nanowires under high magnetic fields

Yamane, Yuta; Ieda, Junichi; Maekawa, Sadamichi

Applied Physics Letters, 100(16), p.162401_1 - 162401_3, 2012/04

 Times Cited Count:6 Percentile:68.26(Physics, Applied)

Journal Articles

Time-domain observation of the spinmotive force in permalloy nanowires

Hayashi, Masamitsu*; Ieda, Junichi; Yamane, Yuta; Oe, Junichiro*; Takahashi, Yukiko*; Mitani, Seiji*; Maekawa, Sadamichi

Physical Review Letters, 108(14), p.147202_1 - 147202_5, 2012/04

 Times Cited Count:26 Percentile:20.43(Physics, Multidisciplinary)

Spinmotive force associated with a moving domain wall is observed directly in permalloy nanowires using real time voltage measurements with proper subtraction of the electromotive force. Whereas the wall velocity exhibits nonlinear dependence on a magnetic field, the generated voltage increases linearly with the field. We show that the sign of the voltage reverses when the wall propagation direction is altered. Numerical simulations explain quantitatively these features of spinmotive force and indicate that the spinmotive force scales with the field even in a field range where the wall motion is no longer associated with periodic structure transformation.

Journal Articles

Continuous generation of spinmotive force in a patterned ferromagnetic film

Yamane, Yuta; Sasage, Kohei*; An, Toshu*; Harii, Kazuya*; Oe, Junichiro*; Ieda, Junichi; Barnes, S. E.*; Saito, Eiji; Maekawa, Sadamichi

Physical Review Letters, 107(23), p.236602_1 - 236602_4, 2011/11

 Times Cited Count:36 Percentile:15.26(Physics, Multidisciplinary)

Journal Articles

Spinmotive force due to intrinsic energy of ferromagnetic nanowires

Yamane, Yuta; Ieda, Junichi; Oe, Junichiro*; Barnes, S. E.*; Maekawa, Sadamichi

Applied Physics Express, 4(9), p.093003_1 - 093003_3, 2011/09

 Times Cited Count:7 Percentile:64.31(Physics, Applied)

Journal Articles

Equation-of-motion approach of spin-motive force

Yamane, Yuta; Ieda, Junichi; Oe, Junichiro*; Barnes, S. E.*; Maekawa, Sadamichi

Journal of Applied Physics, 109(7), p.07C735_1 - 07C735_3, 2011/04

 Times Cited Count:15 Percentile:40.3(Physics, Applied)

Oral presentation

Domain wall motion due to wire-shape effect, and spin-motive force

Yamane, Yuta; Ieda, Junichi; Oe, Junichiro; Maekawa, Sadamichi

no journal, , 

no abstracts in English

Oral presentation

Equations-of-motion approach of spin-motive force

Yamane, Yuta; Ieda, Junichi; Oe, Junichiro; Barnes, S. E.*; Maekawa, Sadamichi

no journal, , 

Oral presentation

Spin-motive force due to intrinsic magnetic energy difference of a domain wall in a shaped nanostripe

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

no journal, , 

Recently, it has been revealed that, in magnetic nanostructures, there is a correction to Faraday's law of induction, i.e., the discovery of spin-motive force. Emergence of the spin-motive force involves magnetization dynamics in magnetic nanostructures. Thus far, while the spin-motive force has been demonstrated in experiments, magnetization dynamics in those systems has been driven by applied magnetic fields. Instead, by using a shaped magnetic nanostripe, the generation of spin-motive force without external driving forces has been proposed theoretically. In this work we perform detailed numerical calculations for the proposal.

Oral presentation

Wire shape effect on spinmotive force

Yamane, Yuta; Ieda, Junichi; Oe, Junichiro*; Barnes, S. E.*; Maekawa, Sadamichi

no journal, , 

Oral presentation

Generation of DC spin-motive force in a patterned ferromagnetic film

Yamane, Yuta; Sasage, Kohei*; An, Toshu*; Harii, Kazuya*; Oe, Junichiro*; Ieda, Junichi; Barnes, S. E.*; Saito, Eiji; Maekawa, Sadamichi

no journal, , 

Oral presentation

Spin-motive force due to magnetic domain wall motion in shaped nanostripes

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

no journal, , 

In magnetic nanostructures, there is a correction to Faraday's law of induction. The effect, which is called as a spin-motive force, has been demonstrated in magnetic domain wall (DW) motion and an electron transport through magnetic nanoparticles. In such experiments, however, magnetization dynamics is driven by applied magnetic fields. Instead, by using a shaped magnetic nanostripe, the generation of spin-motive force without external driving forces has been proposed. We perform numerical calculations for the proposal. For a magnetic nanostripe designed to have two asymmetrical notches, a DW can be trapped at the notches lowering its surface energy. We apply a short pulse of a magnetic field for the DW to overcome the intermediate energy barrier between two notches. Then the DW is displaced automatically to the next notch discharging its magnetic energy via spin-motive force. We combine micromagnetic simulations and calculation of the spin-motive force to analyze this system.

Oral presentation

Spinmotive force due to the intrinsic energy of ferromagnets

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

no journal, , 

no abstracts in English

38 (Records 1-20 displayed on this page)