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Sadamichi Maekawa,Hiroto Adachi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The thermopower, the so-called Seebeck effect, is the conversion of heat to electricity and is dueto the entropy carried by conduction electrons. In strongly-correlated electron systems and Kondomaterials, spin fluctuation is shown to bring about an entropy in conduction electrons and to resultin a giant thermopower. Recently, the spin Seebeck effect, which reflects the conversion via thespin current in magnetic materials, was discovered. The mechanism is examined and a variety ofexperiments are explained.
Linear-Response Theory of the Longitudinal Spin Seebeck Effect
Hiroto Adachi,Sadamichi Maekawa 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We theoretically investigate the longitudinal spin Seebeck effect, in which the spin current isinjected from a ferromagnet into an attached nonmagnetic metal in a direction parallel to thetemperature gradient. Using the fact that the phonon heat current flows intensely into the attachednonmagnetic metal in this particular configuration, we show that the sign of the spin injection signalin the longitudinal spin Seebeck effect can be opposite to that in the conventional transverse spinSeebeck effect when the electron-phonon interaction in the nonmagnetic metal is sufficiently large. Our linear-response approach can explain the sign reversal of the spin injection signal recentlyobserved in the longitudinal spin Seebeck effect.
Real-time Analysis of the Spinmotive Force due to Domain Wall Motion
Jun’ichi Ieda,Sadamichi Maekawa,Yuta Yamane 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Using numerical simulations, we study the spinmotive force induced by domain wall motion in ahigh magnetic field region far above the Walker breakdown field. We find that the DC componentof the spinmotive force scales with the applied magnetic field even in a field range where the wallmotion is no longer associated with periodic angular rotation of the wall magnetization. As the fieldis increased, spikes in the voltage signals start to appear, which are mainly attributed to vortex corecollisions, nucleation, and annihilation, and this tendency is enhanced with further increases in thefield. At high fields, the slope of the generated DC voltage vs. applied field curve is expected todepend only on the spin polarization of conduction electrons and, thus, can be used to accuratelydetermine the degree of spin polarization in various materials.
Effects of Mechanical Rotation and Vibration on Spin Currents
Mamoru Matsuo,Jun’ichi Ieda,Sadamichi Maekawa,Eiji Saitoh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We discuss theoretically the generation of spin currents in both rotationally and linearly accelerated systems. The spin-orbit interaction modified by inertial effects is derived from the low energy limit of the generally covariant Dirac equation. It is shown that the spin-orbit interaction is responsible for the generation of spin currents by mechanical rotation and vibration. We also study effects of impurity scattering on the mechanically induced spin current, and calculate the spin accumulation by solving the spin diffusion equation with the spin-source term originating from the inertial effects.