Abstract
Ultrafast 100 femtosecond laser light was irradiated on an amorphous GdFeCo film under a DC magnetic field. Complete magnetization reversal and rewritable response were observed in a less than 1 picosecond time period. This experiment reveals the intrinsic capability of ultrafast high-speed rewitable storage under the thermomagnetic switching scheme. Current pure magnetic recording such as that in the case of hard disk storage has a serious spin reversal time problem limited by the ferromagnetic resonance (FMR) frequency. Such frequency is ordinarily 1 to 3 GHz, which means that the recording speed limit is of a similar order. A one-picosecond response enables a very attractive future information storage scheme realizing 10 to 1000 Gbps ultrafast devices.
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