Resonant driving of magnetization precession in a ferromagnetic layer by coherent monochromatic phonons

TL;DR

This paper demonstrates resonant excitation of magnetization precession in a ferromagnetic layer using monochromatic phonons within a phononic resonator, showing significant amplitude enhancement at resonance.

Contribution

It introduces a method to resonantly drive magnetization precession using coherent phonons in a structured resonator, enabling control over magnetic dynamics.

Findings

Resonant phonon modes excite large magnetization precession amplitudes.

Precession amplitude peaks when magnetic and phonon frequencies match.

Femtosecond laser pulses generate phonons in the 10-40 GHz range.

Abstract

We realize resonant driving of the magnetization precession by monochromatic phonons in a thin ferromagnetic layer embedded into a phononic Fabry-Perot resonator. A femtosecond laser pulse excites resonant phonon modes of the structure in the 10-40 GHz frequency range. By applying an external magnetic field, we tune the precession frequency relative to the frequency of the phonons localized in the cavity and observe the enormous increase in the amplitude of the magnetization precession when the frequencies of free magnetization precession and phonons localized in the cavity are equal.