Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-0-260172 |
Author: | Holmqvist, Cecilia; Fogelström, Mikael; Belzig, Wolfgang |
Year of publication: | 2014 |
Published in: | Physical Review B ; 90 (2014), 1. - 014516. - ISSN 1098-0121. - eISSN 1550-235X |
DOI (citable link): | https://dx.doi.org/10.1103/PhysRevB.90.014516 |
Summary: |
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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Subject (DDC): | 530 Physics |
Link to License: | In Copyright |
Bibliography of Konstanz: | Yes |
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} }
Holmqvist_260172.pdf | 888 |