Ultrafast optical manipulation of ferromagnetic order in InMnAs/GaSb
J. Wang, G.A. Khodaparast, J. Kono, T. Slupinski, A. Oiwa, and H., Munekata
TL;DR
This study demonstrates ultrafast optical control of ferromagnetic order in InMnAs/GaSb heterostructures through photo-induced spin-polarized carriers, significantly altering magnetic properties on femtosecond timescales.
Contribution
It introduces a novel method for ultrafast manipulation of ferromagnetism using intense mid-infrared pulses in a specific heterostructure.
Findings
Magnetic properties can be strongly modified by ultrafast optical pulses.
Changes depend on pump polarization, intensity, and temperature.
Ultrafast spin-polarized carriers are responsible for the observed effects.
Abstract
We have performed a two-color time-resolved magneto-optical Kerr effect (MOKE) study of a ferromagnetic InMnAs/GaSb heterostructure. We observed ultrafast photo-induced changes in the MOKE signal induced by a large density of spin-polarized transient carriers created only within the InMnAs layer using intense 140 fs mid-infrared pulses. Our data clearly demonstrates that magnetic properties, e.g., remanence and coercivity, can be strongly modified. The dependence of these changes on the time delay, pump polarization, pump intensity, and sample temperature is discussed.
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Taxonomy
TopicsSemiconductor Quantum Structures and Devices · Magneto-Optical Properties and Applications · Neural Networks and Reservoir Computing