Ultrafast optical manipulation of magnetic order in ferromagnetic materials

Ultrafast Optical Manipulation of Ferromagnetic Order in InMnAs/GaSb

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...

Ultrafast magnetization dynamics in ferromagnetic materials

In recent magneto optical experiments (TR-MOKE) the timescale of laser induced demagnetization was found to be shorter than 0.5 ps. However, doubts have been raised if the measured signal reflects genuine loss of magnetic moment at all. Also, for these experiments no broadly accepted theory exists. Although a few models are able to fit the data, they generally have in common that they violate o...

Ultrafast Manipulation of Spins in Antiferromagnetic Materials: New Avenue in Magnetic Memory?

Ultrafast Magneto - Optical Spectroscopy of ( III , Mn ) V Ferromagnetic Semiconductors

Ultrafast Magneto-Optical Spectroscopy of (III,Mn)V Ferromagnetic Semiconductors

Ultrafast optical encoding of magnetic resonance

Temporal resolution in magnetic resonance imaging (MRI) is limited by the time required to encode the position of spins using time-varying (10–100 ms) magnetic field gradients. Here, we demonstrate spatial encoding of MRI images in a time that is three orders of magnitude shorter than what is possible by conventional gradient encoding techniques. Our method exploits the chemically induced dynam...