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

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

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HOLMQVIST, Cecilia, Mikael FOGELSTRÖM, Wolfgang BELZIG, 2013. Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection

@unpublished{Holmqvist2013Spinp-22473, title={Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection}, year={2013}, author={Holmqvist,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

Belzig, Wolfgang eng Belzig, Wolfgang Holmqvist, Cecilia 2013-03-18T10:00:14Z 2013-03-18T10:00:14Z 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. 2013 Fogelström, Mikael Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection terms-of-use Fogelström, Mikael Holmqvist, Cecilia

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