Generation of a localized microwave magnetic field by coherent phonons in a ferromagnetic nanograting

TL;DR

This paper demonstrates a method to generate highly localized, high-amplitude microwave magnetic fields at the nanoscale by using coherent phonons to induce magnetization precession in a ferromagnetic nanograting, with potential applications in quantum technologies.

Contribution

It introduces a novel technique for localized microwave magnetic field generation using laser-excited surface acoustic waves in ferromagnetic nanostructures.

Findings

Achieved magnetic induction up to 10 mT at nanometer scale

Demonstrated laser-driven excitation of localized surface acoustic waves

Enabled spatially resolved control of spin states

Abstract

A high-amplitude microwave magnetic field localized at the nanoscale is a desirable tool for various applications within the rapidly developing field of nanomagnetism. Here, we drive magnetization precession by coherent phonons in a metal ferromagnetic nanograting and generate ac-magnetic induction with extremely high amplitude (up to $10$ mT) and nanometer scale localization in the grating grooves. We trigger the magnetization by a laser pulse which excites localized surface acoustic waves. The developed technique has prospective uses in several areas of research and technology, including spatially resolved access to spin states for quantum technologies.