Publikation: Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection
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Physical Review B. 2014, 90(1), 014516. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.90.014516
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 ωL 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 ωL/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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HOLMQVIST, Cecilia, Mikael FOGELSTRÖM, Wolfgang BELZIG, 2014. Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection. In: Physical Review B. 2014, 90(1), 014516. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.90.014516BibTex
@article{Holmqvist2014Spinp-29575,
year={2014},
doi={10.1103/PhysRevB.90.014516},
title={Spin-polarized Shapiro steps and spin-precession-assisted multiple Andreev reflection},
number={1},
volume={90},
issn={1098-0121},
journal={Physical Review B},
author={Holmqvist, Cecilia and Fogelström, Mikael and Belzig, Wolfgang},
note={Article Number: 014516}
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<dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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