Ultrafast Light-Induced Magnetization Dynamics of Ferromagnetic Semiconductors

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...

Element-resolved Ultrafast Magnetization Dynamics in Ferromagnetic Alloys and Multilayers

Unifying ultrafast magnetization dynamics.

We present a microscopic model that successfully explains the ultrafast equilibration of magnetic order in ferromagnetic metals at a time scale tau(M) of only a few hundred femtoseconds after pulsed laser excitation. It is found that tau(M) can be directly related to the so-called Gilbert damping factor sigma that describes damping of GHz precessional motion of the magnetization vector. Indepen...

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

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

Magnetization relaxation in „Ga,Mn...As ferromagnetic semiconductors

Jairo Sinova, T. Jungwirth, X. Liu, Y. Sasaki, J. K. Furdyna, W. A. Atkinson, and A. H. MacDonald Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA Institute of Physics ASCR, Cukrovarnická 10, 162 53 Praha 6, Czech Republic Department of Physics, University of Texas at Austin, Austin, Texas 78712-0264, USA Department of Physics, University of Notre Dame, Notre ...