Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film

M.K. Marcham; W. Yu; P.S. Keatley; R.J. Hicken; L.R. Shelford; S.A. Cavill; G. Van Der Laan; P. Shafer; H. Qing; E. Arenholz; A. Neudert; J.R. Childress; J.A. Katine; N.D. Telling

doi:10.1063/1.4792740

Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film

M.K. Marcham, W. Yu, P.S. Keatley, R.J. Hicken, L.R. Shelford, S.A. Cavill, G. Van Der Laan, P. Shafer, H. Qing, E. Arenholz, A. Neudert, J.R. Childress, J.A. Katine, N.D. Telling

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Precessional dynamics of a CoFe(0.7)/Ni Fe(5)/Dy(1)/Ru(3) (thicknesses in nm) thin film have been explored by low temperature time-resolved magneto-optical Kerr effect and phase-resolved x-ray ferromagnetic resonance measurements. As the temperature was decreased from 300 to 140 K, the magnetic damping was found to increase rapidly while the resonance field was strongly reduced. Static x-ray magnetic circular dichroism measurements revealed increasing ferromagnetic order of the Dy moment antiparallel to that of CoFe/Ni Fe. Increased coupling of the Dy orbital moment to the precessing spin magnetization leads to significantly increased damping and gyromagnetic ratio of the film while leaving its magnetic anisotropy effectively unchanged.

Original language	English
Article number	062418
Journal	Applied Physics Letters
Volume	102
Issue number	6
DOIs	https://doi.org/10.1063/1.4792740
Publication status	Published - 11 Feb 2013

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Marcham, M. K., Yu, W., Keatley, P. S., Hicken, R. J., Shelford, L. R., Cavill, S. A., Van Der Laan, G., Shafer, P., Qing, H., Arenholz, E., Neudert, A., Childress, J. R., Katine, J. A., & Telling, N. D. (2013). Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film. Applied Physics Letters, 102(6), Article 062418. https://doi.org/10.1063/1.4792740

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abstract = "Precessional dynamics of a CoFe(0.7)/Ni Fe(5)/Dy(1)/Ru(3) (thicknesses in nm) thin film have been explored by low temperature time-resolved magneto-optical Kerr effect and phase-resolved x-ray ferromagnetic resonance measurements. As the temperature was decreased from 300 to 140 K, the magnetic damping was found to increase rapidly while the resonance field was strongly reduced. Static x-ray magnetic circular dichroism measurements revealed increasing ferromagnetic order of the Dy moment antiparallel to that of CoFe/Ni Fe. Increased coupling of the Dy orbital moment to the precessing spin magnetization leads to significantly increased damping and gyromagnetic ratio of the film while leaving its magnetic anisotropy effectively unchanged.",

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AU - Marcham, M.K.

AU - Yu, W.

AU - Keatley, P.S.

AU - Hicken, R.J.

AU - Shelford, L.R.

AU - Cavill, S.A.

AU - Van Der Laan, G.

AU - Shafer, P.

AU - Qing, H.

AU - Arenholz, E.

AU - Neudert, A.

AU - Childress, J.R.

AU - Katine, J.A.

AU - Telling, N.D.

PY - 2013/2/11

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AB - Precessional dynamics of a CoFe(0.7)/Ni Fe(5)/Dy(1)/Ru(3) (thicknesses in nm) thin film have been explored by low temperature time-resolved magneto-optical Kerr effect and phase-resolved x-ray ferromagnetic resonance measurements. As the temperature was decreased from 300 to 140 K, the magnetic damping was found to increase rapidly while the resonance field was strongly reduced. Static x-ray magnetic circular dichroism measurements revealed increasing ferromagnetic order of the Dy moment antiparallel to that of CoFe/Ni Fe. Increased coupling of the Dy orbital moment to the precessing spin magnetization leads to significantly increased damping and gyromagnetic ratio of the film while leaving its magnetic anisotropy effectively unchanged.

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Influence of a Dy overlayer on the precessional dynamics of a ferromagnetic thin film

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