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Spin-torque excitation of perpendicular standing spin waves in coupled YIG/Co heterostructures

Published

Author(s)

Stefan Klinger, Vivek P. Amin, Stephan Gepraegs, Kathrin Ganzhorn, Hannes Maier-Flaig, Matthias Althammer, Hans Huebl, Rudolf Gross, Robert McMichael, Mark D. Stiles, Sebastian Goennenwein, Mathias Weiler

Abstract

We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance frequencies of the YIG PSSWs and the Co FMR line coincide. Avoided crossings of YIG PSSWs and the Co FMR line are found and modeled using mutual spin pumping and exchange torques. The excitation of PSSWs is suppressed by a thin aluminum oxide (AlOx) interlayer but persists with a copper (Cu) interlayer, in agreement with the proposed model.
Citation
Physical Review Letters
Volume
120
Issue
12

Keywords

spin waves, magnonics, ferromagnetic resonance, spin pumping, spin transfer torque

Citation

Klinger, S. , Amin, V. , Gepraegs, S. , Ganzhorn, K. , Maier-Flaig, H. , Althammer, M. , Huebl, H. , Gross, R. , McMichael, R. , Stiles, M. , Goennenwein, S. and Weiler, M. (2018), Spin-torque excitation of perpendicular standing spin waves in coupled YIG/Co heterostructures, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.120.127201, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=924797 (Accessed April 24, 2024)
Created March 22, 2018, Updated October 12, 2021