Magnetomechanical Torques in Small Magnetic Cantilevers

TL;DR

This paper investigates how magnetomechanical torques in small magnetic cantilevers influence their dynamics, enabling enhanced detection and control of nanoscale motion, with potential applications in nanomotors and magnetoelectronic devices.

Contribution

It demonstrates the effects of magnetomechanical torques on ferromagnetic resonance and proposes integrating mechanical oscillators into magnetoelectronic systems for improved motion transduction.

Findings

Magnetomechanical torques cause line splittings in resonance spectra.

Mechanical degrees of freedom facilitate magnetization reversal.

The proposed nanomotor converts rf magnetic fields into mechanical oscillations.

Abstract

We study the dnamics of small magnetic cantilevers, either made from Si covered by a magnetic film or entirely ferromagnetic ones. The magnetomechanical torques are found to cause line splittings in ferromagnetic resonance spectra and magnetization reversal facilitated by mechanical degrees of freedom. We show that the magnetomechanical torques can extend the limits of detecting and exciting motion at the nanoscale. A "nanomotor" described here effectively transforms rf magnetic fields into mechanical oscillations. We furthermore propose to integrate mechanical oscillators into magnetoelectronic devices that make use of current-induced spin-transfer torques. This opens new possibilities for electric transducers of nanomechanical motion.