Abstract
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 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.
- Received 10 April 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.117201
©2009 American Physical Society
Viewpoint
For faster magnetic switching—destroy and rebuild
Published 8 September 2009
Magnetic switching is typically a continuous process, where a field pulse rotates a magnet from up to down, but it is now possible to do this faster — and with all-optical methods — by first quenching the magnetization to zero and then repolarizing it in the opposite direction.
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