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Title: Engineering Gilbert damping by dilute Gd doping in soft magnetic Fe thin films

By analyzing the ferromagnetic resonance linewidth, we show that the Gilbert damping constant in soft magnetic Fe thin films can be enhanced by ∼6 times with Gd doping of up to 20%. At the same time, the magnetic easy axis remains in the film plane while the coercivity is strongly reduced after Gd inclusion. X-ray magnetic circular dichroism measurements reveal a strong increase in the orbital-to-spin moment ratio of Fe with increasing Gd concentration, in full agreement with the increase in the Gilbert damping obtained for these thin films. Combined with x-ray diffraction and vibrating sample magnetometry, the results demonstrate that the FeGd thin films with dilute Gd doping of up to 20% are promising candidates for spin-transfer-torque applications in soft magnetic devices, in which an enhanced damping is required.
Authors:
; ; ; ;  [1] ; ; ; ;  [2] ;  [3]
  1. Department of Physics, Southeast University, Nanjing 211189 (China)
  2. NanoElectronics Group, MESA Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede (Netherlands)
  3. Diamond Light Source, Magnetic Spectroscopy Group, Didcot OX11 0DE (United Kingdom)
Publication Date:
OSTI Identifier:
22273892
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; COERCIVE FORCE; CONCENTRATION RATIO; DAMPING; FERROMAGNETIC RESONANCE; GADOLINIUM; INCLUSIONS; INTERMETALLIC COMPOUNDS; IRON; LINE WIDTHS; MAGNETIC CIRCULAR DICHROISM; SPIN; THIN FILMS; TORQUE; X-RAY DIFFRACTION