Dispersion and spin wave "tunneling" in nano-structured magnetostatic spin waveguides
A. Kozhanov (1), D. Ouellette (1), M. Rodwell (1), A. P. Jacob (2), D., W. Lee (3), S. X. Wang (3), S. J. Allen (1) ((1) University of California at, Santa Barbara (2)Technology, Manufacturing Group, Intel Corporation, Santa, Clara
TL;DR
This paper investigates magnetostatic spin wave behavior in nano-structured ferromagnetic waveguides, demonstrating spin wave tunneling through air gaps and measuring dispersion and attenuation properties.
Contribution
It provides experimental measurements of spin wave dispersion and loss in micron-scale ferromagnetic waveguides, highlighting spin wave tunneling through air gaps.
Findings
Measured attenuation lengths around 3 micrometers.
Spin waves can tunnel through air gaps up to 1.5 micrometers.
Results align with theoretical dispersion models.
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. The measured attenuation lengths, of the order of 3um, are several of orders of magnitude shorter than that predicted from eddy currents in these thin wires. Spin waves effectively "tunnel" through air gaps, produced by focused ion beam etching, as large as 1.5 um.
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