Dispersion in magnetostatic CoTaZr spin wave-guides
A. Kozhanov (1), D. Ouellette (1), Z. Griffith (1), M. Rodwell (1), A., P. Jacob (2), D. W. Lee (3), S. X. Wang (3), S. J. Allen (1) ((1)California, Nanosystems Institute, University of California at Santa Barbara, Santa, Barbara, CA, (2) Technology, Manufacturing Group
TL;DR
This paper measures and analyzes spin wave dispersion and loss in micron-scale CoTaZr ferromagnetic waveguides, revealing multiple modes and unexpectedly short attenuation lengths contrary to eddy current predictions.
Contribution
It provides experimental measurements of spin wave dispersion and loss in CoTaZr waveguides, confirming models and identifying multiple modes with shorter attenuation lengths than expected.
Findings
Multiple spin wave modes identified
Attenuation lengths around 3 microns
Shorter attenuation than eddy current models predict
Abstract
Magnetostatic spin wave dispersion and loss are measured in micron scale spin wave-guides in ferromagnetic, metallic CoTaZr. Results are in good agreement with model calculations of spin wave dispersion and up to three different modes are identified. Attenuation lengths of the order of 3 microns are several of orders of magnitude shorter than that predicted from eddy currents in these thin wires.
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