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arXiv · 1601.02081

Switching the magnetization of magnetostrictive nanomagnets from single-domain to non-volatile vortex states with a surface acoustic wave

Vimal Sampath·Noel ďSouza·Dhritiman Bhattacharya·Gary M. Atkinson·Supriyo Bandyopadhyay·Jayasimha Atulasimha
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Abstract

We report manipulation of the magnetic states of elliptical cobalt magnetostrictive nanomagnets (of nominal dimensions ~ 340 nm x 270 nm x 12 nm) delineated on bulk 128{\deg} Y-cut lithium niobate with Surface Acoustic Waves (SAWs) launched from interdigitated electrodes. Isolated nanomagnets that are initially magnetized to a single domain state with magnetization pointing along the major axis of the ellipse are driven into a vortex state by surface acoustic waves that modulate the stress anisotropy of these nanomagnets. The nanomagnets remain in the vortex state until they are reset by a strong magnetic field to the initial single domain state, making the vortex state non-volatile. This phenomenon is modeled and explained using a micromagnetic framework and could lead to the development of extremely energy efficient magnetization switching methodologies.

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Vimal Sampath, Noel ďSouza, Dhritiman Bhattacharya, Gary M. Atkinson, Supriyo Bandyopadhyay, Jayasimha Atulasimha. 2016-01-09. Switching the magnetization of magnetostrictive nanomagnets from single-domain to non-volatile vortex states with a surface acoustic wave. https://doi.org/10.1021/acs.nanolett.6b02342

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