Spin-wave propagation and spin-polarized electron transport in single-crystal iron films
Abstract
The techniques of propagating spin-wave spectroscopy and current-induced spin-wave Doppler shift are applied to a 20-nm-thick Fe/MgO(001) film. The magnetic parameters extracted from the position of the spin-wave resonance peaks are very close to those tabulated for bulk iron. From the zero-current propagating wave forms, a group velocity of 4 km/s and an attenuation length of about 6 μ m are extracted for 1.6-μ m -wavelength spin wave at 18 GHz. From the measured current-induced spin-wave Doppler shift, we extract a surprisingly high degree of spin polarization of the current of 83 % , which constitutes the main finding of this work. This set of results makes single-crystalline iron a promising candidate for building devices utilizing high-frequency spin waves and spin-polarized currents.
- Publication:
-
Physical Review B
- Pub Date:
- November 2017
- DOI:
- 10.1103/PhysRevB.96.174420
- arXiv:
- arXiv:1704.02217
- Bibcode:
- 2017PhRvB..96q4420G
- Keywords:
-
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 5 figures, submitted to Phys. Rev. B