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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:13 Percentile:56.08(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.

Oral presentation

Spinmotive force due to antiferromagnetic dynamics

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

no journal, , 

Recently, spintronics phenomena in antiferromagnets (AFM) attract attention. Especially spin transfer torque (STT) and spinmotive force (SMF) that have been established and play principal roles in ferromagnets become important subjects since they enable us to control and detect AFM dynamics. A few approaches have been theoretically proposed for treating these effects in AFMs but they are still under debate. In this work, we theoretically investigate SMF due to AFM dynamics by incorporating the finite canting between sublattice magnetizations, non-adiabaticity of the electron dynamics, and the Rashba spin-orbit interaction, which were all omitted in previous work. We show that the electric voltages can be generated by field-induced AFM domain wall motion and AFM resonance. This finding is useful as providing an electrical detection method of AFM dynamics and opens up the possibility of materials search for the larger SMF signals.

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