Temporal evolution of inverse spin Hall effect voltage in a magnetic insulator-nonmagnetic metal structure

Abstract

It is demonstrated that upon pulsed microwave excitation, the temporal behavior of a spin-wave induced inverse spin Hall voltage in a magnetic insulator-nonmagnetic metal structure is distinctly different from the temporal evolution of the directly excited spin-wave mode from which it originates. The difference in temporal behavior is attributed to the excitation of long-lived secondary spin-wave modes localized at the insulator-metal interface.

The full magnon spectrum of yttrium iron garnet

“…1 Such systems exploit the established toolbox of electron-based spintronics as well as the ability of magnons to be decoupled from their environment and efficiently manipulated both magnetically and electrically. 8,[11][12][13] There has been particular interest in YIG after the demonstrated transmission of electrically injected magnons over distances of 1 mm. 5 Short-wavelength magnons can also diffuse over distances of~50 μm even at room temperature, ideal for application in devices.…”

Spin-wave excitation and propagation in microstructured waveguides of yttrium iron garnet/Pt bilayers

“…To experimentally detect the spin waves in the microstructured waveguide, we employ microfocus Brillouin light scattering spectroscopy (BLS) [3][4][5][6][7][8] . This method allows us to study the spin-wave intensity as a function of magnetic field and spin-wave frequency.…”

“…Another key feature of magnon spintronics is its close relationship to a multitude of physical phenomena like spin-pumping, spin-transfer torque, spin Seebeck effect, and (inverse) spin Hall effect, which allow for the amplification, generation and transformation between charge currents and magnonic currents [7][8][9][10][11][12][15][16][17][18][19][20][21][22][23][24] . Hetero-structures of YIG covered with a thin layer of platinum (Pt) have proven to show these effects which opens a way to a new class of insulator based spintronics.…”

“…The concept of magnon spintronics, i.e., the transport and manipulation of pure spin currents in the form of spin-wave quanta, called magnons, has attracted growing interest in the recent years [1][2][3][4][5][6][7][8][9][10][11][12] . One of the key advantages of magnon spin currents is their large decay length which can be several orders of magnitude higher than the spin diffusion length in conventional spintronic devices based on spin-polarized electron currents.…”

Spin Seebeck effect and ballistic transport of quasi-acoustic magnons in room-temperature yttrium iron garnet films

“…It has been experimentally demonstrated [19] by using coherently excited magnons, that in low-damping magnetic materials, such as epitaxial YIG films, the temporal profile of the ISHE voltage is dominated by the magnon dynamics in the magnetic insulator, rather than by the very fast electron dynamics in the normal metal. Similarly, it has been shown [20] that the LSSE dynamics is strongly influenced by the transport of thermal magnons inside the magnetic mat erial and, thus, depends on the temporal development of the temper ature gradient in the magnetic material close to the YIG/Pt interface.…”