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Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

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Holmqvist_224736.pdf
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2013

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Fogelström, Mikael

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http://nbn-resolving.de/urn:nbn:de:bsz:352-224736
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http://arxiv.org/abs/1302.7107

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Zusammenfassung

We investigate the charge and spin transport of a voltage-biased superconducting point contact coupled to a nanomagnet. The magnetization of the nanomagnet is assumed to precess with the Larmor frequency, $\omega_L$, due to ferromagnetic resonance. The interplay between the ac Josephson current and the magnetization dynamics leads to spin-polarized Shapiro steps at voltages $|V|=\hbar \omega_L/2en$ for $n=1,2,...$ and the subharmonic steps with $n>1$ are a consequence of multiple Andreev reflection (MAR). Moreover, the spin-precession-assisted MAR generates quasiparticle scattering amplitudes that, due to interference, lead to current-voltage characteristics of the dc charge and spin currents with subharmonic gap structures displaying an even-odd effect.

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530 Physik

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ISO 690HOLMQVIST, Cecilia, Mikael FOGELSTRÖM, Wolfgang BELZIG, 2013. Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection
BibTex
@unpublished{Holmqvist2013Spinp-22473,
  year={2013},
  title={Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection},
  author={Holmqvist, Cecilia and Fogelström, Mikael and Belzig, Wolfgang}
}
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