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Title: Effect of spacer layer on the magnetization dynamics of permalloy/rare-earth/permalloy trilayers

The permalloy/rare-earth/permalloy trilayers with different types (Gd and Nd) and thicknesses of spacer layer are investigated using frequency dependence of ferromagnetic resonance (FMR) measurements at room temperature, which shows different behaviors with different rare earth spacer layers. By fitting the frequency dependence of the FMR resonance field and linewidth, we find that the in-plane uniaxial anisotropy retains its value for all samples, the perpendicular anisotropy remains almost unchanged for different thickness of Gd layer but the values are tailored by different thicknesses of Nd layer. The Gilbert damping is almost unchanged with different thicknesses of Gd; however, the Gilbert damping is significantly enhanced from 8.4×10{sup −3} to 20.1×10{sup −3} with 6 nm of Nd and then flatten out when the Nd thickness rises above 6 nm.
Authors:
; ; ; ; ;  [1] ; ;  [2]
  1. Physics Department, Southeast University, Nanjing 211189 (China)
  2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22410059
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; DAMPING; FERROMAGNETIC RESONANCE; FREQUENCY DEPENDENCE; GADOLINIUM; LAYERS; MAGNETIZATION; NEODYMIUM; PERMALLOY; SPACERS; TEMPERATURE RANGE 0273-0400 K; THICKNESS