Spin Waves Generated by Elastic Waves
Abstract
This research studies aimes to demonstrate that spin waves (magnons) can be efficiently generated using acoustic waves and that these acoustic waves can drive the spin waves over large distances (by orders of magnitude) compared to the propagation distances of spin waves alone. The proposed research consists of theoretical modeling, fabrication, and testing. Theoretical modeling will be based on previous work at UCLA on coupled micromagnetic and elastodynamic equations, which include exchange coupling, magneto-crystal anisotropy, Zeeman energy, demagnetization effects, and magnetoelastic energy. To fabricate the device structures for investigation, a Ni spin bus will be deposited on a piezoelectric substrate. A series of microantennas are deposited as spin wave signal detectors along the length of the bus, while an elastic wave transducer will be fabricated at the end of the spin bus. Two devices types will be compared, one using surface acoustic excitation at the beginning of the spin bus and the other using magnetic field excitation via a microantenna. The first device type generates a spin wave via strain mediated coupling of the acoustic wave in the piezoelectric material to the magnetoelastic Ni. The second device generates a spin wave in the Ni directly via magnetic coupling. The differences in propagation distance of the spin waves will be measured, analyzed in the model, and evaluated to understand the relevant physical mechanisms.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1610419
Entities
People
- Gregory P. Carman
Organizations
- Army Contracting Command
- United States Army
- University of California, Los Angeles