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

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

Abstract

Precessional dynamics of a Co50Fe50(0.7)/Ni90Fe10(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 Co50Fe50/Ni90Fe10. 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.

Citation

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

• Journal Article Type: Article
• Online Publication Date: Feb 15, 2013
• Publication Date: Feb 11, 2013
• Deposit Date: Jun 12, 2023
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: AIP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 102
• Issue: 6
• Pages: 062418
• DOI: https://doi.org/10.1063/1.4792740
• Keywords: Physics and Astronomy (miscellaneous), Magnetic anisotropy, Magnetic ordering, Waveguides, Electrodynamics, X-ray magnetic circular dichroism spectroscopy, Ferromagnetic resonance, Thin films, Gyromagnetic ratio, Magnetooptical effects, Spin valves
• Public URL: https://keele-repository.worktribe.com/output/445328