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

DOI: 10.1063/1.4792740 DOI Help

Authors: M. Marcham (University of Exeter) , W. Yu (University of Exeter) , P. Keatley (University of Exeter) , L. Shelford (Diamond Light Source) , P. Shafer (Advanced Light Source) , S. Cavill (University of York, Diamond Light Source) , H. Qing (Advanced Light Source) , A. Neudert (Institute of Ion Beam Physics and Materials Research) , J. R. Childress (San Jose Research Center) , J. A. Katine (San Jose Research Center) , E. Arenholz (Advanced Light Source) , N. D. Telling (Keely University) , G. Van Der Laan (Diamond Light Source) , R. Hicken (University of Exeter)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Letters , VOL 102 (6) , PAGES 337-345

State: Published (Approved)
Published: February 2013

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.

Journal Keywords: Nickel; Magnetic Films; Temperature Measurement; Magnetic Anisotropy; X-Ray Optics

Subject Areas: Physics


Instruments: I06-Nanoscience

Other Facilities: ALS