Abstract
Domain walls in magnetic thin films are being explored for memory applications and the speed at which they move has acquired increasing importance. Magnetic fields and currents have been shown to drive domain walls with speeds exceeding 500 m/s. We investigate another approach to increase domain wall velocities, using high frequency surface acoustic waves to create standing strain waves in a 3 micron wide strip of magnetic film with perpendicular anisotropy. Our measurements, at a resonant frequency of 248.8 MHz, indicate that domain wall velocities increase substantially, even at relatively low applied voltages. Our findings suggest that the strain wave derived effective magnetic field acts as an additional driver for domain wall motion.
Highlights
Where B1 and B2 are the longitudinal and shear magneto-elastic constants which are material dependent, eii and eij constitute the longitudinal and shear strains in the magnetic film and the αi are the direction cosines of the magnetization
Our previous paper10 had shown that surface acoustic waves (SAW) were efficient drivers of domain walls (DW) in a large area thin film
We make detailed and wide-ranging measurements of the effects of SAW on DW velocity in a microscopic strip that restricts the direction of DW motion and allows us to quantitatively model the effects of the SAW
Summary
Adenwalla COLLECTIONS Paper published as part of the special topic on 65th Annual Conference on Magnetism and Magnetic Materials
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