title: Acoustic-Wave-Induced Magnetization Switching of Magnetostrictive Nanomagnets from Single-Domain to Nonvolatile Vortex States.
abstract: We report experimental manipulation of the magnetic states of elliptical cobalt magnetostrictive nanomagnets (with nominal dimensions of ∼340 nm × 270 nm × 12 nm) delineated on bulk 128° Y-cut lithium niobate with acoustic waves (AWs) launched from interdigitated electrodes. Isolated nanomagnets (no dipole interaction with any other nanomagnet) that are initially magnetized with a magnetic field to a single-domain state with the magnetization aligned along the major axis of the ellipse are driven into a vortex state by 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 nonvolatile. This phenomenon is modeled and explained using a micromagnetic framework and could lead to the development of extremely energy efficient magnetization switching methodologies for low-power computing applications.
authors: Department of Mechanical and Nuclear Engineering and ‡Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors: Vimal
authors: V
authors: Sampath
authors: Department of Mechanical and Nuclear Engineering and ‡Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors: Noel
authors: N
authors: D'Souza
authors: Department of Mechanical and Nuclear Engineering and ‡Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors: Dhritiman
authors: D
authors: Bhattacharya
authors: Department of Mechanical and Nuclear Engineering and ‡Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors: Gary M
authors: GM
authors: Atkinson
authors: Department of Mechanical and Nuclear Engineering and ‡Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors: Supriyo
authors: S
authors: Bandyopadhyay
authors: Department of Mechanical and Nuclear Engineering and ‡Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.
authors: Jayasimha
authors: J
authors: Atulasimha
keywords: Acoustic waves; lithium niobate; magnetization switching; magnetostrictive; micromagnetic simulations; multiferroic; piezoelectric; vortex states