Share Email Print

Proceedings Paper

Dual-frequency ferromagnetic resonance to measure spin current coupling in multilayers
Author(s): Rohan Adur; Chunhui Du; Hailong Wang; Sergei A. Manuilov; Fengyuan Yang; P. Chris Hammel
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Spin pumping is a method for injecting a pure spin current into a non-magnetic metal (NM) by inducing precession of a neighboring ferromagnet (FM) at its ferromagnetic resonance frequency. A popular method to detect spin current uses the Inverse Spin Hall Effect (ISHE) to convert the spin current to a detectable charge current and hence a voltage. In order to better understand the role of time independent and high frequency contributions to spin pumping, we sought to detect we attempt to detect spin currents by using a second microwave frequency to detect changes in linewidth of a second ferromagnet due to the spin-torque induced by the spin current from the first ferromagnet. This dual resonance is achieved by pairing a custom broadband coplanar transmission line with the high-Q resonant cavity of a commercial electron paramagnetic resonance spectrometer. This technique is general enough that it should enable the investigation of spin currents in any FM-NM-FM system, for any orientation of external field, and is not sensitive to voltage artifacts often found in ISHE measurements. We find that the condition for simultaneous resonance generates a dc spin current that is too small to produce a measurable change in linewidth of the second ferromagnet, confirming the dominance of ac spin currents in linewidth enhancement measurements.

Paper Details

Date Published: 28 August 2014
PDF: 6 pages
Proc. SPIE 9167, Spintronics VII, 91672J (28 August 2014); doi: 10.1117/12.2066174
Show Author Affiliations
Rohan Adur, The Ohio State Univ. (United States)
Chunhui Du, The Ohio State Univ. (United States)
Hailong Wang, The Ohio State Univ. (United States)
Sergei A. Manuilov, The Ohio State Univ. (United States)
Fengyuan Yang, The Ohio State Univ. (United States)
P. Chris Hammel, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 9167:
Spintronics VII
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?