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

Two self-assembly of ultrathin Co nanowires (NWs) embedded in a CeO2 matrix was grown on SrTiO3(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 enoug...

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Bibliographic Details
Published in:Journal of applied physics 2015-12, Vol.118 (23)
Main Authors: Roussigné, Y., Chérif, S. M., Stashkevich, A. A., Vidal, F., Zheng, Y.
Format: Article
Language:English
Subjects:
ANISOTROPY
Applied physics
ASPECT RATIO
BRILLOUIN EFFECT
CERIUM OXIDES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COBALT
CYLINDERS
Dipole interactions
LIGHT SCATTERING
Magnetic measurement
MAGNETIZATION
Magnons
Mathematical models
MEAN-FIELD THEORY
NANOWIRES
OPACITY
Physics
Propagation modes
Remanence
Self-assembly
SILICON
Silicon substrates
SPIN WAVES
STRONTIUM TITANATES
VISIBLE RADIATION
WIRES
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Summary:Two self-assembly of ultrathin Co nanowires (NWs) embedded in a CeO2 matrix was grown on SrTiO3(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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4937133