Ferromagnetic resonance in low interacting permalloy nanowire arrays

被引：32

作者：

Raposo, V. ^{[1
]}

Zazo, M. ^{[1
]}

Flores, A. G. ^{[1
]}

Garcia, J.

Vega, V.

Iniguez, J. ^{[1
]}

Prida, V. M. ^{[2
]}

机构：

[1] Univ Salamanca, Dept Fis Aplicada, E-37071 Salamanca, Spain

[2] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain

来源：

JOURNAL OF APPLIED PHYSICS | 2016年 / 119卷 / 14期

关键词：

MAGNETIC-INTERACTIONS; NI NANOWIRES;

D O I：

10.1063/1.4945762

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2016 AIP Publishing LLC.

引用

页数：5

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