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Title: Seed influence on the ferromagnetic resonance response of Co/Ni multilayers

The effect of Pd and Ru seed layers on the magnetic properties of [Co/Ni]{sub N} multilayers with varying number of bilayer repeats N is investigated using vector network analyzer ferromagnetic resonance. The effective anisotropy field H{sub Keff} is found to increase with N for Ru seed, but decreases for Pd until N = 15. As N is increased beyond 15, H{sub Keff} decreases for both seeds. In contrast, the damping parameter α decreases with N regardless of the seed, showing a 1/N dependence. Taking spin pumping into account, the intrinsic damping α{sub 0} for both Pd and Ru seeds reduce to α{sub 0} ≈ 0.01. These results demonstrate that there can be a strong influence of the seed/Co interface on anisotropy, especially for sufficiently low N, but not necessarily on α{sub 0}.
Authors:
; ; ; ;  [1]
  1. Data Storage Institute, Agency for Science, Technology and Research, 5 Engineering Drive 1, Singapore 117608 (Singapore)
Publication Date:
OSTI Identifier:
22273814
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; COBALT; COBALT COMPOUNDS; DAMPING; FERROMAGNETIC RESONANCE; INTERFACES; INTERMETALLIC COMPOUNDS; LAYERS; MAGNETIC PROPERTIES; NICKEL; NICKEL NITRIDES; PALLADIUM; RUTHENIUM; SPIN