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

Holmqvist, Cecilia; Fogelström, Mikael; Belzig, Wolfgang

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

Dateien

Holmqvist_260172.pdfGröße: 1.31 MBDownloads: 786

Datum

2014

Autor:innen

Holmqvist, Cecilia

Fogelström, Mikael

Belzig, Wolfgang

URI (zitierfähiger Link)

http://nbn-resolving.de/urn:nbn:de:bsz:352-0-260172

DOI (zitierfähiger Link)

https://doi.org/10.1103/PhysRevB.90.014516

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

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 ω_L 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_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.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

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.90.014516

BibTex

@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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