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Title: Adjustable ferromagnetic resonance frequency in CoO/CoFeB system

Static and dynamic properties of (CoO/CoFeB){sub n} multilayers have been investigated. An anisotropy field enhancement was evidenced when the CoO layer was deposited under the CoFeB layer. Tuning the relative CoFeB and CoO layers thicknesses, high ferromagnetic resonance frequencies up to 4 GHz were achieved. The coupling effect between the CoO and CoFeB layers was induced by a dipolar coupling due to the anisotropic roughness topology of the CoO layer. This anisotropic roughness was induced by the deposition geometry and evidenced by atomic force microscopy. The strength of the dipolar interfacial coupling was calculated thanks to Schlömann's model. Multilayer stacks were fabricated and the magnetic properties observed for the trilayers could be maintained.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5]
  1. CEA Le Ripault, BP16, 37260 Monts (France)
  2. (France)
  3. LPS, CNRS UMR 8502, University of Paris-Sud, 91405 Orsay Cedex (France)
  4. LMB EA4522, University of Brest, 6 av. Le Gorgeu, 29238 Brest Cedex 3 (France)
  5. GREMAN, CNRS UMR 7347, University of Tours, 37200 Tours (France)
Publication Date:
OSTI Identifier:
22412954
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 3; 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; ATOMIC FORCE MICROSCOPY; COBALT OXIDES; COUPLING; DEPOSITION; FERROMAGNETIC RESONANCE; GHZ RANGE; INTERFACES; IRON BORIDES; LAYERS; MAGNETIC PROPERTIES; ROUGHNESS