Ryo Iguchi

One-dimensional spinon spin currents

Eiji Saitoh† Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577, Japan The Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan and WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan (Dated: September 26, 2016)

Spin current generation from sputtered Y3Fe5O12 films

Spin current injection from sputtered yttrium iron garnet (YIG) films into an adjacent platinum layer has been investigated by means of the spin pumping and the spin Seebeck effects. Films with a thickness of 83 and 96 nanometers were fabricated by on-axis magnetron rf sputtering at room temperature and subsequent post-annealing. From the frequency dependence of the ferromagnetic resonance linewidth, the damping constant has been estimated to be

Effect of spin Hall magnetoresistance on spin pumping measurements in insulating magnet/metal systems

(7.0\pm1.0)\times 10^{-4}

All-optical observation and reconstruction of spin wave dispersion

. Magnitudes of the spin current generated by the spin pumping and the spin Seebeck effect are of the same order as values for YIG films prepared by liquid phase epitaxy. The efficient spin current injection can be ascribed to a good YIG|Pt interface, which is confirmed by the large spin-mixing conductance

Spin pumping by nonreciprocal spin waves under local excitation

(2.0\pm0.2)\times 10^{18}

Spin Pumping without Three-Magnon Splitting in Polycrystalline Bi1Y2Fe5O12/Pt Bilayer Structure

m

Electrical determination of spin mixing conductance at metal/insulator interface using inverse spin Hall effect

^{-2}

Observation of temperature-gradient-induced magnetization

.

Thermographic Measurements of the Spin Peltier Effect in Metal/Yttrium-Iron-Garnet Junction Systems

We investigate a dc rectification effect of magnetization dynamics based on spin Hall magnetoresistance (SMR) in an insulating magnet/metal system on spin pumping measurements. We theoretically find that the rectification effect by SMR has different in-plane magnetization angle dependence from that of the inverse spin Hall effect on the spin pumping. The negligible contribution from the rectification effect is experimentally confirmed in a cavity measurement.

Reducing galvanomagnetic effects in spin pumping measurement with Co75Fe25 as a spin injector

To know the properties of a particle or a wave, one should measure how its energy changes with its momentum. The relation between them is called the dispersion relation, which encodes essential information of the kinetics. In a magnet, the wave motion of atomic spins serves as an elementary excitation, called a spin wave, and behaves like a fictitious particle. Although the dispersion relation of spin waves governs many of the magnetic properties, observation of their entire dispersion is one of the challenges today. Spin waves whose dispersion is dominated by magnetostatic interaction are called pure-magnetostatic waves, which are still missing despite of their practical importance. Here, we report observation of the band dispersion relation of pure-magnetostatic waves by developing a table-top all-optical spectroscopy named spin-wave tomography. The result unmasks characteristics of pure-magnetostatic waves. We also demonstrate time-resolved measurements, which reveal coherent energy transfer between spin waves and lattice vibrations.