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.

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