Controlling effective field contributions to laser-induced magnetization precession by heterostructure design

Author:

Jarecki Jasmin,Mattern MaximilianORCID,Weber Fried-Conrad,Pudell Jan-Etienne,Wang Xi-Guang,Rojas Sánchez Juan-CarlosORCID,Hehn MichelORCID,von Reppert AlexanderORCID,Bargheer MatiasORCID

Abstract

AbstractNanoscale heterostructure design can control laser-induced heat dissipation and strain propagation, as well as their efficiency for driving magnetization precession. Here, we incorporate MgO layers into the experimental platform of metallic Pt-Cu-Ni heterostructures to block the propagation of hot electrons. We show via ultrafast x-ray diffraction the capability of our platform to control the spatio-temporal shape of the transient heat and strain. Time-resolved magneto-optical Kerr experiments with systematic tuning of the magnetization precession frequency showcase control of the magnetization dynamics in the Ni layer. Our experimental analysis highlights the role of quasi-static strain as a driver of precession when the magnetic material is rapidly heated via electrons. The effective magnetic field change originating from demagnetization partially compensates the change induced by quasi-static strain. The strain pulses can be shaped via the nanoscale heterostructure design to efficiently drive the precession, paving the way for opto-magneto-acoustic devices with low heat energy deposited in the magnetic layer.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Springer Science and Business Media LLC

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