Spin-torque ferromagnetic resonance measurements of damping in nanomagnets

G. D. Fuchs; J. C. Sankey; V. S. Pribiag; L. Qian; P. M. Braganca; A. G.F. Garcia; E. M. Ryan; Zhi Pan Li; O. Ozatay; D. C. Ralph; R. A. Buhrman

doi:10.1063/1.2768000

Spin-torque ferromagnetic resonance measurements of damping in nanomagnets

G. D. Fuchs, J. C. Sankey, V. S. Pribiag, L. Qian, P. M. Braganca, A. G.F. Garcia, E. M. Ryan, Zhi Pan Li, O. Ozatay, D. C. Ralph, R. A. Buhrman

Physics and Astronomy (Twin Cities)

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Abstract

The authors directly measure the magnetic damping parameter α in thin-film CoFeB and Permalloy (Py) nanomagnets at room temperature using a recently developed ferromagnetic resonance technique where the precessional mode of an individual nanomagnet can be excited by microwave-frequency spin-transfer torque and detected by the giant magnetoresistance effect. The authors obtain αCoFeB =0.014±0.003 and αPy =0.010±0.002, values comparable to measurements for extended thin films, establishing that patterned nanomagnets can exhibit magnetic damping that is consistent with that of unpatterned bulk material.

Original language	English (US)
Article number	062507
Journal	Applied Physics Letters
Volume	91
Issue number	6
DOIs	https://doi.org/10.1063/1.2768000
State	Published - 2007

Bibliographical note

Funding Information:
This research was supported in part by the NSF/NSEC program through the Cornell Center for Nanoscale Systems and by the Office of Naval Research. Additional support was provided by NSF through use of the Cornell Nanoscale Science and Technology Facility/NNIN and the facilities of the Cornell Center for Materials Research.

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title = "Spin-torque ferromagnetic resonance measurements of damping in nanomagnets",

abstract = "The authors directly measure the magnetic damping parameter α in thin-film CoFeB and Permalloy (Py) nanomagnets at room temperature using a recently developed ferromagnetic resonance technique where the precessional mode of an individual nanomagnet can be excited by microwave-frequency spin-transfer torque and detected by the giant magnetoresistance effect. The authors obtain αCoFeB =0.014±0.003 and αPy =0.010±0.002, values comparable to measurements for extended thin films, establishing that patterned nanomagnets can exhibit magnetic damping that is consistent with that of unpatterned bulk material.",

author = "Fuchs, {G. D.} and Sankey, {J. C.} and Pribiag, {V. S.} and L. Qian and Braganca, {P. M.} and Garcia, {A. G.F.} and Ryan, {E. M.} and Li, {Zhi Pan} and O. Ozatay and Ralph, {D. C.} and Buhrman, {R. A.}",

note = "Funding Information: This research was supported in part by the NSF/NSEC program through the Cornell Center for Nanoscale Systems and by the Office of Naval Research. Additional support was provided by NSF through use of the Cornell Nanoscale Science and Technology Facility/NNIN and the facilities of the Cornell Center for Materials Research. ",

year = "2007",

doi = "10.1063/1.2768000",

language = "English (US)",

volume = "91",

journal = "Applied Physics Letters",

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T1 - Spin-torque ferromagnetic resonance measurements of damping in nanomagnets

AU - Fuchs, G. D.

AU - Sankey, J. C.

AU - Pribiag, V. S.

AU - Qian, L.

AU - Braganca, P. M.

AU - Garcia, A. G.F.

AU - Ryan, E. M.

AU - Li, Zhi Pan

AU - Ozatay, O.

AU - Ralph, D. C.

AU - Buhrman, R. A.

N1 - Funding Information: This research was supported in part by the NSF/NSEC program through the Cornell Center for Nanoscale Systems and by the Office of Naval Research. Additional support was provided by NSF through use of the Cornell Nanoscale Science and Technology Facility/NNIN and the facilities of the Cornell Center for Materials Research.

PY - 2007

Y1 - 2007

N2 - The authors directly measure the magnetic damping parameter α in thin-film CoFeB and Permalloy (Py) nanomagnets at room temperature using a recently developed ferromagnetic resonance technique where the precessional mode of an individual nanomagnet can be excited by microwave-frequency spin-transfer torque and detected by the giant magnetoresistance effect. The authors obtain αCoFeB =0.014±0.003 and αPy =0.010±0.002, values comparable to measurements for extended thin films, establishing that patterned nanomagnets can exhibit magnetic damping that is consistent with that of unpatterned bulk material.

AB - The authors directly measure the magnetic damping parameter α in thin-film CoFeB and Permalloy (Py) nanomagnets at room temperature using a recently developed ferromagnetic resonance technique where the precessional mode of an individual nanomagnet can be excited by microwave-frequency spin-transfer torque and detected by the giant magnetoresistance effect. The authors obtain αCoFeB =0.014±0.003 and αPy =0.010±0.002, values comparable to measurements for extended thin films, establishing that patterned nanomagnets can exhibit magnetic damping that is consistent with that of unpatterned bulk material.

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U2 - 10.1063/1.2768000

DO - 10.1063/1.2768000

M3 - Article

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VL - 91

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 6

M1 - 062507

ER -

Spin-torque ferromagnetic resonance measurements of damping in nanomagnets

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