Spin current generated by thermally driven ultrafast demagnetization
- Spin current generated by thermally driven ultrafast demagnetization
- 최경민; 민병철; 이경진; David Cahill
- Issue Date
- Nature Communications
- VOL 5, 4334-1-4334-8
- Spin current is the key element for nanoscale spintronic devices. For ultrafast operation of
such nano-devices, generation of spin current in picoseconds, a timescale that is difficult to
achieve using electrical circuits, is highly desired. Here we show thermally driven ultrafast
demagnetization of a perpendicular ferromagnet leads to spin accumulation in a normal metal
and spin transfer torque in an in-plane ferromagnet. The data are well described by models
of spin generation and transport based on differences and gradients of thermodynamic
parameters. The temperature difference between electrons and magnons is the driving force
for spin current generation by ultrafast demagnetization. On longer timescales, a few
picoseconds following laser excitation, we also observe a small contribution to spin current by
a temperature gradient and the spin-dependent Seebeck effect.
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