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- Title
Controlling effective field contributions to laser-induced magnetization precession by heterostructure design.
- Authors
Jarecki, Jasmin; Mattern, Maximilian; Weber, Fried-Conrad; Pudell, Jan-Etienne; Wang, Xi-Guang; Rojas Sánchez, Juan-Carlos; Hehn, Michel; von Reppert, Alexander; Bargheer, Matias
- 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. Nanoscale heterostructure design can control laser-induced heat dissipation and strain propagation as well as their efficiency for driving magnetization precession. The authors present a platform that incorporates MgO layers into metallic Pt-Cu-Ni heterostructures, in order to clarify how controlled transient strain and heat tailor magnetization dynamics.
- Subjects
MAGNETIZATION; MAGNETIC materials; HOT carriers; MAGNETIC fields; DEMAGNETIZATION
- Publication
Communications Physics, 2024, Vol 7, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-024-01602-z