Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures

Ganguly, Arnab; Azzawi, Sinan; Saha, Susmita; King, J.A.; Rowan-Robinson, R.M.; Hindmarch, A.T.; Sinha, Jaivardhan; Atkinson, Del; Barman, Anjan

doi:10.1038/srep17596

Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures

Ganguly, Arnab; Azzawi, Sinan; Saha, Susmita; King, J.A.; Rowan-Robinson, R.M.; Hindmarch, A.T.; Sinha, Jaivardhan; Atkinson, Del; Barman, Anjan

Authors

Arnab Ganguly

Sinan Azzawi

Susmita Saha

Dr Jennifer King jennifer.king@durham.ac.uk
Senior Project Manager

R.M. Rowan-Robinson

Dr Aidan Hindmarch a.t.hindmarch@durham.ac.uk
Associate Professor

Jaivardhan Sinha

Professor Del Atkinson del.atkinson@durham.ac.uk
Professor

Anjan Barman

Abstract

Interface modification for control of ultrafast magnetic properties using low-dose focused ion beam irradiation is demonstrated for bilayers of two technologically important materials: Ni81Fe19 and Pt. Magnetization dynamics were studied using an all-optical time-resolved magneto-optical Kerr microscopy method. Magnetization relaxation, precession, damping and the spatial coherence of magnetization dynamics were studied. Magnetization precession was fitted with a single-mode damped sinusoid to extract the Gilbert damping parameter. A systematic study of the damping parameter and frequency as a function of irradiation dose varying from 0 to 3.3 pC/μm2 shows a complex dependence upon ion beam dose. This is interpreted in terms of both intrinsic effects and extrinsic two-magnon scattering effects resulting from the expansion of the interfacial region and the creation of a compositionally graded alloy. The results suggest a new direction for the control of precessional magnetization dynamics, and open the opportunity to optimize high-speed magnetic devices.

Citation

Ganguly, A., Azzawi, S., Saha, S., King, J., Rowan-Robinson, R., Hindmarch, A., …Barman, A. (2015). Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures. Scientific Reports, 5, Article 17596. https://doi.org/10.1038/srep17596

Journal Article Type	Article
Acceptance Date	Nov 2, 2015
Online Publication Date	Dec 1, 2015
Publication Date	Dec 1, 2015
Deposit Date	Dec 3, 2015
Publicly Available Date	Dec 4, 2015
Journal	Scientific Reports
Publisher	Nature Research
Peer Reviewed	Peer Reviewed
Volume	5
Article Number	17596
DOI	https://doi.org/10.1038/srep17596
Public URL	https://durham-repository.worktribe.com/output/1417341

Files

Published Journal Article (1 Mb)
PDF

Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/