Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19bilayer and determination of Pt spin Hall angle

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

doi:10.1063/1.4896277

Time-domain detection of current controlled magnetization damping in Pt/Ni₈₁Fe₁₉bilayer and determination of Pt spin Hall angle

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

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Abstract

The effect of spin torque from the spin Hall effect in Pt/Ni₈₁Fe₁₉rectangular 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 Ni₈₁Fe₁₉. 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.

Original language	British English
Article number	112409
Journal	Applied Physics Letters
Volume	105
Issue number	11
DOIs	https://doi.org/10.1063/1.4896277
State	Published - 15 Sep 2014

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title = "Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19bilayer and determination of Pt spin Hall angle",

abstract = "The effect of spin torque from the spin Hall effect in Pt/Ni81Fe19rectangular 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 Ni81Fe19. 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.",

author = "A. Ganguly and Rowan-Robinson, {R. M.} and A. Haldar and S. Jaiswal and J. Sinha and Hindmarch, {A. T.} and Atkinson, {D. A.} and A. Barman",

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T1 - Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19bilayer and determination of Pt spin Hall angle

AU - Ganguly, A.

AU - Rowan-Robinson, R. M.

AU - Haldar, A.

AU - Jaiswal, S.

AU - Sinha, J.

AU - Hindmarch, A. T.

AU - Atkinson, D. A.

AU - Barman, A.

PY - 2014/9/15

Y1 - 2014/9/15

N2 - The effect of spin torque from the spin Hall effect in Pt/Ni81Fe19rectangular 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 Ni81Fe19. 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.

AB - The effect of spin torque from the spin Hall effect in Pt/Ni81Fe19rectangular 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 Ni81Fe19. 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.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 11

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ER -

Time-domain detection of current controlled magnetization damping in Pt/Ni₈₁Fe₁₉bilayer and determination of Pt spin Hall angle

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