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Journal Articles Communications Physics Year : 2024

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

Abstract

Nanoscale 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.
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Dates and versions

hal-04585756 , version 1 (23-05-2024)

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Jasmin Jarecki, Maximilian Mattern, Fried-Conrad Weber, Jan-Etienne Pudell, Xi-Guang Wang, et al.. Controlling effective field contributions to laser-induced magnetization precession by heterostructure design. Communications Physics, 2024, 7 (1), pp.112. ⟨10.1038/s42005-024-01602-z⟩. ⟨hal-04585756⟩
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