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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. and Rowan-Robinson, R.M. and Haldar, A. and Jaiswal, S. and Sinha, J. and Hindmarch, A.T. and Atkinson, D. 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). p. 112409.

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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.4896277
Publisher 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.
Date accepted:10 September 2014
Date deposited:24 November 2014
Date of first online publication:19 September 2014
Date first made open access:No date available

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