Ultrafast path for optical magnetization reversal via a strongly nonequilibrium state.
Using time-resolved single-shot pump-probe microscopy we unveil the mechanism and the time scale of all-optical magnetization reversal by a single circularly polarized 100 fs laser pulse. We demonstrate that the reversal has a linear character, i.e., does not involve precession but occurs via a strongly nonequilibrium state. Calculations show that the reversal time which can be achieved via this mechanism is within 10 ps for a 30 nm domain. Using two single subpicosecond laser pulses we demonstrate that for a 5 microm domain the magnetic information can be recorded and readout within 30 ps, which is the fastest "write-read" event demonstrated for magnetic recording so far.
Institute for Molecules and Materials, Radboud University Nijmegen, P.O. Box 9010 6500 GL Nijmegen, The Netherlands. K.Vahaplar@science.ru.nl
K
K
Vahaplar
A M
AM
Kalashnikova
A V
AV
Kimel
D
D
Hinzke
U
U
Nowak
R
R
Chantrell
A
A
Tsukamoto
A
A
Itoh
A
A
Kirilyuk
Th
T
Rasing