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.
@article{arxiv.1712.02561,
title = {Spin waves in coupled YIG/Co heterostructures},
author = {Stefan Klingler and Vivek Amin and Stephan Geprägs and Kathrin Ganzhorn and Hannes Maier-Flaig and Matthias Althammer and Hans Huebl and Rudolf Gross and Robert D. McMichael and Mark D. Stiles and Sebastian T. B. Goennenwein and Mathias Weiler},
journal= {arXiv preprint arXiv:1712.02561},
year = {2018}
}
Comments
Main text (5 pages, 3 figures), Supplemental Material (12 pages, 6 figures): sample preparation, experimental setup, data processing, determination of the material parameters, linewidth analysis, dynamic spin torque theory, and detailed interfacial spin torque model