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Tunable magnetization dynamics in interfacially modified Ni81Fe19/Pt bilayer thin film microstructures.

Ganguly, Arnab and Azzawi, Sinan and Saha, Susmita and King, J. A. and Rowan-Robinson, R. M. and Hindmarch, A. T. and Sinha, Jaivardhan and Atkinson, Del and Barman, Anjan (2015) 'Tunable magnetization dynamics in interfacially modified Ni81Fe19/Pt bilayer thin film microstructures.', Scientific reports., 5 . 17596 .

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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1038/srep17596
Publisher 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/
Date accepted:02 November 2015
Date deposited:04 December 2015
Date of first online publication:01 December 2015
Date first made open access:No date available

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