Magnetoelastic Coupling and Possibility of Spintronic Electromagnetomechanical Effects

TL;DR

This paper explores how ac spin-polarized currents can induce resonant magneto-mechanical oscillations in nanorods with antiferromagnetic layers, opening new possibilities for spintronic devices and high-frequency oscillators.

Contribution

It introduces the concept of current-controlled magneto-mechanical effects in nanorods with antiferromagnetic layers, expanding the scope of spintronic applications beyond ferromagnetic systems.

Findings

Spin-polarized ac current induces coupled magneto-mechanical oscillations.

Antiferromagnetic layers can produce oscillating magnetization via spin-transfer torque.

Potential applications in magnetometry and high-frequency mechanical oscillators.

Abstract

Nanoelectromangetomechanical systems (NEMMS) open up a new path for the development of high speed autonomous nanoresonators and signal generators that could be used as actuators, for information processing, as elements of quantum computers etc. Those NEMMS that include ferromagnetic layers could be controlled by the electric current due to effects related with spin transfer. In the present paper we discuss another situation when the current-controlled behaviour of nanorod that includes an antiferro- (instead of one of ferro-) magnetic layer. We argue that in this case ac spin-polarized current can also induce resonant coupled magneto-mechanical oscillations and produce an oscillating magnetization of antiferromagnetic (AFM) layer. These effects are caused by \emph{i}) spin-transfer torque exerted to AFM at the interface with nonmagnetic spacer and by \emph{ii}) the effective magnetic field produced by the spin-polarized free electrons due to $sd$-exchange.The described nanorod with an AFM layer can find an application in magnetometry and as a current-controlled high-frequency mechanical oscillator.