Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers

Abstract

We use ferromagnetic resonance to study the current-induced torques in YIG/heavy metal bilayers. YIG samples with thickness varying from 14.8 nm to 80 nm, with the Pt or Ta thin film on top, are measured by applying a microwave current into the heavy metals and measuring the longitudinal DC voltage generated by both spin rectification and spin pumping. From a symmetry analysis of the FMR lineshape and its dependence on YIG thickness, we deduce that the Oersted field dominates over spin-transfer torque in driving magnetization dynamics.

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Item Type:	Article
Authors/Creators:	Fang, Z Mitra, A Westerman, AL Ali, M Ciccarelli, C Cespedes, O https://orcid.org/0000-0002-5249-9523 Hickey, BJ https://orcid.org/0000-0001-8289-5618 Ferguson, AJ
Copyright, Publisher and Additional Information:	© 2017 Author(s). This is an author produced version of a paper published in Applied Physics Letters. Uploaded in accordance with the publisher's self-archiving policy.
Dates:	Published: 27 February 2017 Published (online): 27 February 2017 Accepted: 14 February 2017
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	25 Apr 2017 10:45
Last Modified:	18 Jan 2018 19:55
Published Version:	https://doi.org/10.1063/1.4977490
Status:	Published
Publisher:	AIP Publishing
Identification Number:	10.1063/1.4977490
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:115565

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Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers

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