Ferromagnetic resonance in low interacting permalloy nanowire arrays

Dipolar interactions on magnetic nanowire arrays have been investigated by various techniques. One of the most powerful techniques is the ferromagnetic resonance spectroscopy, because the resonance field depends directly on the anisotropy field strength and its frequency dependence. In order to eval...

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Bibliographic Details
Published in:Journal of applied physics 2016-04, Vol.119 (14)
Main Authors: Raposo, V., Zazo, M., Flores, A. G., Garcia, J., Vega, V., Iñiguez, J., Prida, V. M.
Format: Article
Language:English
Subjects:
ALUMINIUM OXIDES
Aluminum oxide
ANISOTROPY
Applied physics
Arrays
Atomic layer epitaxy
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DAMPING
Dependence
DIAGRAMS
DISPERSIONS
ELECTROCHEMISTRY
ELECTRODEPOSITION
FERROMAGNETIC RESONANCE
Ferromagnetism
Ferrous alloys
Field strength
FREQUENCY DEPENDENCE
GYROMAGNETIC RATIO
INTERACTIONS
Intermetallic compounds
Iron compounds
LATTICE PARAMETERS
LAYERS
Magnetic alloys
MAGNETIC FIELDS
MEMBRANES
NANOWIRES
Nickel compounds
PERMALLOY
Porosity
SPECTROSCOPY
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Summary:Dipolar interactions on magnetic nanowire arrays have been investigated by various techniques. One of the most powerful techniques is the ferromagnetic resonance spectroscopy, because the resonance field depends directly on the anisotropy field strength and its frequency dependence. In order to evaluate the influence of magnetostatic dipolar interactions among ferromagnetic nanowire arrays, several densely packed hexagonal arrays of NiFe nanowires have been prepared by electrochemical deposition filling self-ordered nanopores of alumina membranes with different pore sizes but keeping the same interpore distance. Nanowires’ diameter was changed from 90 to 160 nm, while the lattice parameter was fixed to 300 nm, which was achieved by carefully reducing the pore diameter by means of Atomic Layer Deposition of conformal Al2O3 layers on the nanoporous alumina templates. Field and frequency dependence of ferromagnetic resonance have been studied in order to obtain the dispersion diagram which gives information about anisotropy, damping factor, and gyromagnetic ratio. The relationship between resonance frequency and magnetic field can be explained by the roles played by the shape anisotropy and dipolar interactions among the ferromagnetic nanowires.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4945762