Ultrafast Optical Manipulation of Ferromagnetic Order in InMnAs/GaSb
نویسندگان
چکیده
We have performed a two-color time-resolved magneto-optical Kerr effect (MOKE) study of a ferromagnetic InMnAs/GaSb heterostructure. We observed ultrafast photoinduced 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.
منابع مشابه
Cyclotron Resonance of Itinerant Holes in Ferromagnetic InMnAs/GaSb Heterostructures
We report the first observation of hole cyclotron resonance (CR) in ferromagnetic InMnAs/GaSb heterostructures both in the high-temperature paramagnetic phase and the low-temperature ferromagnetic phase. We clearly resolve two resonances that exhibit strong temperature dependence in position, linewidth, and intensity. We attribute the two resonances to the so-called fundamental CR transitions e...
متن کاملUltrafast quenching of ferromagnetism in InMnAs induced by intense laser irradiation.
Time-resolved magneto-optical Kerr spectroscopy of ferromagnetic InMnAs reveals two distinct demagnetization processes--fast (<1 ps) and slow (approximately 100 ps). Both components diminish with increasing temperature and are absent above the Curie temperature. The fast component rapidly grows with pump power and saturates at high fluences (>10 mJ/cm(2)); the saturation value indicates a compl...
متن کاملDetermining Carrier Densities in InMnAs by Cyclotron Resonance
Accurate determination of carrier densities in ferromagnetic semiconductors by Hall measurements is hindered by the anomalous Hall effect, and thus alternative methods are being sought. Here, we propose that cyclotron resonance (CR) is an excellent method for carrier density determination for InMnAs-based magnetic structures. We develop a theory for electronic and magneto-optical properties in ...
متن کاملUltrafast Magneto - Optical Spectroscopy of ( III , Mn ) V Ferromagnetic Semiconductors
Ultrafast Magneto-Optical Spectroscopy of (III,Mn)V Ferromagnetic Semiconductors
متن کاملUltrafast quasi-particle dynamics of charge/orbital ordered and ferromagnetic clusters in La0.7Ca0.3MnO3
We report on the quasi-particle dynamics of the charge/orbital ordered (COO) and ferromagnetic clusters in the optimally doped manganite, La0.7Ca0.3MnO3 (LCMO) single crystal by time-resolved two-color pump–probe spectroscopy. Pump photons with energies of ∼1.55 and ∼0.21 eV were employed in our transient optical spectroscopy to investigate the percolative phase separation including the COO and...
متن کامل