This paper describes a method for achieving continuous deterministic 360∘ magnetic moment rotations in single domain magnetoelastic discs, and examines the performance bounds for a mechanically lossless multiferroic bead-on-a-disc motor based on dipole coupling these discs to small magnetic nanobeads. The continuous magnetic rotations are attained by controlling the relative orientation of a four-fold anisotropy (e.g., cubic magnetocrystalline anisotropy) with respect to the two-fold magnetoelastic anisotropy. This approach produces continuous rotations from the quasi-static regime up through operational frequencies of several GHz. Driving strains of only ≈90 to 180 ppm are required for operation of motors using existing materials. The large operational frequencies and small sizes, with lateral dimensions of ≈100s of nanometers, produce large power densities for the rotary bead-on-a-disc motor, and a newly proposed linear variant, in a size range where power dense alternative technologies do not currently exist.
@article{arxiv.1802.09420,
title = {Multiferroic Micro-Motors with Deterministic Single Input Control},
author = {John P. Domann and Cai Chen and Abdon E. Sepulveda and Rob N. Candler and Greg P. Carman},
journal= {arXiv preprint arXiv:1802.09420},
year = {2018}
}