Spin current generated by thermally driven ultrafast demagnetization

Gyung Min Choi, Byoung Chul Min, Kyoung Jin Lee, David G. Cahill

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number4334
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 2014 Jul 10

Fingerprint

Demagnetization
Magnets
demagnetization
Seebeck effect
Equipment and Supplies
Magnetoelectronics
Temperature
Laser excitation
Torque
Thermodynamics
Thermal gradients
Lasers
Metals
Electrons
Networks (circuits)
temperature gradients
magnons
torque
gradients
thermodynamics

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Spin current generated by thermally driven ultrafast demagnetization. / Choi, Gyung Min; Min, Byoung Chul; Lee, Kyoung Jin; Cahill, David G.

In: Nature Communications, Vol. 5, 4334, 10.07.2014.

Research output: Contribution to journalArticle

Choi, Gyung Min ; Min, Byoung Chul ; Lee, Kyoung Jin ; Cahill, David G. / Spin current generated by thermally driven ultrafast demagnetization. In: Nature Communications. 2014 ; Vol. 5.
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