Coherent control of magnetization precession by double-pulse activation of effective fields from magnetoacoustics and demagnetization

• DOI: 10.48550/arxiv.2311.04803
• Publication Date: 2023-01-01
• Authors: Maximilian Mattern; Fried-Conrad Weber; Dieter Engel; C. Korff-Schmising; Matias Bargheer
• Keywords: Precession; Magnetization dynamics; Coherent control

We demonstrate the coherent optical control of magnetization precession in a thin Ni film by second excitation pulse which amplifies or attenuates induced first depending on fluences pump-pulses and pump-pump delay. This goes beyond conventional strategy, where same mechanism drives out-of phase. balance magneto-acoustic driven quasi-static strain shape-anisotropy change triggered laser-induced demagnetization. These mechanisms tilt transient effective magnetic field opposite directions case negative magneto-elastic coupling ($b_1<0$). While response is linear fluence, demagnetization nonlinear near Curie temperature, enabling fluence-based scenarios.