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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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Prüfsumme: MD5:5ab3a4c1c8a966340de97a00209bc93a

HOLMQVIST, Cecilia, Mikael FOGELSTRÖM, Wolfgang BELZIG, 2014. Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection. In: Physical Review B. 90(1), 014516. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.90.014516

@article{Holmqvist2014Spinp-29575, title={Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection}, year={2014}, doi={10.1103/PhysRevB.90.014516}, number={1}, volume={90}, issn={1098-0121}, journal={Physical Review B}, author={Holmqvist, Cecilia and Fogelström, Mikael and Belzig, Wolfgang}, note={Article Number: 014516} }

2014 Belzig, Wolfgang eng 2015-01-21T10:36:35Z 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 ω<sub>L</sub> when exposed to ferromagnetic resonance conditions. The Larmor precession locally breaks the spin-rotation symmetry of the quasiparticle scattering and generates spin-polarized Shapiro steps for commensurate Josephson and Larmor frequencies that lead to magnetization reversal. This interplay between the ac Josephson current and the magnetization dynamics occurs at voltages |V| = \hbar ω<sub>L</sub>/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. 2015-01-21T10:36:35Z Holmqvist, Cecilia Holmqvist, Cecilia Fogelström, Mikael Fogelström, Mikael Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection Belzig, Wolfgang

Dateiabrufe seit 21.01.2015 (Informationen über die Zugriffsstatistik)

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