Ferromagnetic resonance in low interacting permalloy nanowire arrays

Journal Article · Thu Apr 14 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4945762· OSTI ID:22594584

Raposo, V.; Zazo, M.; Flores, A. G.; Iñiguez, J. ^[1]; Garcia, J.; Vega, V.; Prida, V. M. ^[2]

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1. Departamento de Física Aplicada, University of Salamanca, E-37071 Salamanca (Spain)
2. Departamento de Física, Universidad de Oviedo, E-33007 Oviedo (Spain)

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 Al{sub 2}O{sub 3} 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.

• OSTI ID: 22594584
• Journal Information: Journal of Applied Physics, Vol. 119, Issue 14; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM OXIDES
ANISOTROPY
DAMPING
DIAGRAMS
DISPERSIONS
ELECTROCHEMISTRY
ELECTRODEPOSITION
FERROMAGNETIC RESONANCE
FREQUENCY DEPENDENCE
GYROMAGNETIC RATIO
INTERACTIONS
LATTICE PARAMETERS
LAYERS
MAGNETIC FIELDS
MEMBRANES
NANOWIRES
PERMALLOY
SPECTROSCOPY