Spin Pumping and the Inverse Spin-Hall Effect via Magnetostatic Surface Spin-Wave Modes in YttriumIron Garnet/Platinum Bilayers

Author

Balinsky, Michael ; Ranjbar, Mojtaba ; Haidar, Mohammad ; Durrenfeld, Philipp ; Khartsev, Sergiy ; Slavin, Andrei ; Akerman, Johan ; Dumas, Randy K.

Author_Institution

Dept. of Phys., Univ. of Gothenburg, Gothenburg, Sweden

Volume

6

fYear

2015

fDate

7/7/1905 12:00:00 AM

Firstpage

1

Lastpage

4

Abstract

Spin pumping at a boundary between a yttriumiron garnet (YIG) film and a thin platinum (Pt) layer is studied under conditions in which a magnetostatic surface spin wave (MSSW, or DamonEshbach mode) is excited in YIG by a narrow strip-line antenna. It is shown that the voltage created by the inverse spin-Hall effect (ISHE) in Pt is strongly dependent on the wavevector of the excited MSSW. For YIG film thicknesses of 41 and 0.9m, the maximum ISHE voltage corresponds to the maximum of efficiently excited MSSW wavevectors and does not coincide with the maximum of absorbed microwave power. For a thinner (0.175m) YIG film, the maximum of the ISHE voltage moves closer to the ferromagnetic resonance and almost coincides with the region of the maximum microwave absorption. We show that the effect is related to the change in the thickness profile and the wavenumber spectrum of the excited MSSW taking place when the YIG film thickness is increased.

Keywords

garnets; magnetic thin films; magnetostatic surface waves; microwave spectra; platinum; spin Hall effect; spin waves; yttrium compounds; ISHE voltage; MSSW wave vectors; Y₃Fe₅O₁₂-Pt; YIG film; ferromagnetic resonance; inverse spin-Hall effect; magnetostatic surface spin-wave modes; maximum microwave absorption; narrow strip-line antenna; size 0.9 mum; size 41 mum; spin pumping; thin platinum layer; wavenumber spectrum; yttrium-iron garnet film; yttrium-iron garnet-platinum bilayers; Absorption; Films; Magnetic resonance; Magnetomechanical effects; Magnetostatic waves; Magnetostatics; Microwave measurement; Inverse spin Hall effect; Spin electronics; inverse spin-Hall effect; magnetostatic surface spin waves; spin pumping;

fLanguage

English

Journal_Title

Magnetics Letters, IEEE

Publisher

ieee

ISSN

1949-307X

Type

jour

DOI

10.1109/LMAG.2015.2471276

Filename

7217786