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Article overview
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Time-dependent triplet correlations and spin-transfer torque in superconducting-nanomagnet contacts | | C. Holmqvist
; S. Teber
; M. Fogelström
; | | Date: |
8 Jun 2010 | | Abstract: | We investigate the Josephson effect in a point contact consisting of two
spin-singlet superconductors coupled over a magnetic nanoparticle whose spin
precesses with the Larmor frequency. The rotation of the spin leads to
time-dependent spin-active Andreev scattering across the junction and a
dynamical inverse proximity effect in the form of induced time-dependent
spin-triplet correlations in the superconductors. These correlations produce
Josephson spin currents with precessing polarizations on either side of the
magnetic interface, spin currents which generate a back-action on the rotating
spin by a torque shifting the spin’s precession frequency. In addition to this
novel {em Andreev torque}, we compute the Gilbert damping of the magnetization
dynamics due to tunneling quasiparticles. We propose that the induced triplet
correlations can be assessed by detection of the frequency shift in a
ferromagnetic resonance experiment. | | Source: | arXiv, 1006.1579 | | Services: | Forum | Review | PDF | Favorites | |
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