1. Spin wave amplification using the spin Hall effect in permalloy/platinum bilayers
- Author
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Matthieu Bailleul, O. Gladii, C. Cheng, Joo-Von Kim, Martin Collet, Abdelmadjid Anane, K. Garcia-Hernandez, Stéphane Xavier, Paolo Bortolotti, Yves Henry, and Vincent Cros
- Subjects
Permalloy ,Condensed Matter - Materials Science ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Relaxation (NMR) ,Spin-transfer torque ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,01 natural sciences ,Hall effect ,Spin wave ,0103 physical sciences ,Spin Hall effect ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,0210 nano-technology ,Current density ,Spin-½ - Abstract
We investigate the effect of an electrical current on the attenuation length of a 900 nm wavelength spin-wave in a permalloy/Pt bilayer using propagating spin-wave spectroscopy. The modification of the spin-wave relaxation rate is linear in current density, reaching up to 14% for a current density of 2.3$\times10^{11} $A/m$^2$ in Pt. This change is attributed to the spin transfer torque induced by the spin Hall effect and corresponds to an effective spin Hall angle of 0.13, which is among the highest values reported so far. The spin Hall effect thus appears as an efficient way of amplifying/attenuating propagating spin waves.
- Published
- 2016
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