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Title: Static and dynamic behavior of ultrathin cobalt nanowires embedded in transparent matrix

Two self-assembly of ultrathin Co nanowires (NWs) embedded in a CeO{sub 2} matrix was grown on SrTiO{sub 3}(001) and oxidized Si(001) substrates. A common feature of the two arrays of NWs is the small diameter of the wires, falling in the 4–5 nm range. Combined with their length, the aspect ratio is large enough to ensure large magnetostatic anisotropy with an easy axis along the axis of the nanowires as revealed by magnetometry measurements. The Brillouin light scattering technique has been used to investigate the behavior of the spin waves under a field perpendicular to the NWs axes. The transparency of the matrix ensures the penetration of the probing light inside the sample. Importantly, Brillouin light scattering from the magnetic modes obeys the volume Bragg condition, which is characteristic of the configuration in which the observed modes are propagating along the nanowires and due to their very small diameter are nearly constant across the section. Both series of experimental results are satisfactorily analyzed by means of a single analytical model, based on a mean-field approach, assuming the presence at remanence of two populations of NWs with up and down magnetizations and including the dipolar coupling between the cylinders.
Authors:
;  [1] ;  [1] ;  [2] ; ;  [3]
  1. LSPM, CNRS-UPR 3407, Université Paris 13-Nord, Sorbonne Paris Cité, 99, Av. J.B Clément, 93430 Villetaneuse (France)
  2. (Russian Federation)
  3. Institut des NanoSciences de Paris, UMR CNRS 7588, UPMC Université Paris 6, 4 Place Jussieu, 75005 Paris (France)
Publication Date:
OSTI Identifier:
22493054
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; ASPECT RATIO; BRILLOUIN EFFECT; CERIUM OXIDES; COBALT; CYLINDERS; LIGHT SCATTERING; MAGNETIZATION; MEAN-FIELD THEORY; NANOWIRES; OPACITY; SILICON; SPIN WAVES; STRONTIUM TITANATES; VISIBLE RADIATION; WIRES