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Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle

Ganguly, A.; Rowan-Robinson, R.M.; Haldar, A.; Jaiswal, S.; Sinha, J.; Hindmarch, A.T.; Atkinson, D.; Barman, A.

Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle Thumbnail


Authors

A. Ganguly

R.M. Rowan-Robinson

A. Haldar

S. Jaiswal

J. Sinha

A. Barman



Abstract

The effect of spin torque from the spin Hall effect in Pt/Ni81Fe19 rectangular bilayer film was investigated using time-resolved magneto-optical Kerr microscopy. Current flow through the stack resulted in a linear variation of effective damping up to ±7%, attributed to spin current injection from the Pt into the Ni 81Fe19. The spin Hall angle of Pt was estimated as 0.11 ± 0.03. The modulation of the damping depended on the angle between the current and the bias magnetic field. These results demonstrate the importance of optical detection of precessional magnetization dynamics for studying spin transfer torque due to spin Hall effect.

Citation

Ganguly, A., Rowan-Robinson, R., Haldar, A., Jaiswal, S., Sinha, J., Hindmarch, A., …Barman, A. (2014). Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle. Applied Physics Letters, 105(11), Article 112409. https://doi.org/10.1063/1.4896277

Journal Article Type Article
Acceptance Date Sep 10, 2014
Online Publication Date Sep 19, 2014
Publication Date Sep 15, 2014
Deposit Date Nov 20, 2014
Publicly Available Date Nov 24, 2014
Journal Applied Physics Letters
Print ISSN 0003-6951
Electronic ISSN 1077-3118
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 105
Issue 11
Article Number 112409
DOI https://doi.org/10.1063/1.4896277
Public URL https://durham-repository.worktribe.com/output/1417331

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Copyright Statement
© 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Ganguly, A. and Rowan-Robinson, R. M. and Haldar, A. and Jaiswal, S. and Sinha, J. and Hindmarch, A. T. and Atkinson, D. A. and Barman, A. (2014) 'Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle.', Applied Physics Letters, 105 (11), 112409 and may be found at http://dx.doi.org/10.1063/1.4896277.






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