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Issue 60, 2017, Issue in Progress
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Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’

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Abstract

A method is presented for the preparation of a three-dimensional magnetic data storage material system. The major ingredients are an inert nanoporous matrix prepared by anodization and galvanic plating of magnetic and non-magnetic metals in wire shape inside the cylindrical pores. The individual nanomagnets consist of a nickel–cobalt alloy, the composition of which is tuned systematically by adjusting the electrolytic bath composition at one optimal applied potential. The lowest magnetocrystalline anisotropy is obtained at the composition Ni60Co40, as quantified by superconducting quantum interference device magnetometry. Wires of this composition experience a pinning-free propagation of magnetic domain walls, as determined by single-wire magneto-optical Kerr effect magnetometry. Adding copper into the electrolyte allows one to generate segments of Ni60Co40 separated by non-magnetic copper. The segment structure is apparent in individual nanowires imaged by scanning electron microscopy, UV-photoelectron emission microscopy, and transmission electron microscopy. The single-domain structure of the wire segments is evidenced by magnetic force microscopy.

Graphical abstract: Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’

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Supplementary files

Article information


Submitted
16 Jun 2017
Accepted
19 Jul 2017
First published
31 Jul 2017

This article is Open Access

RSC Adv., 2017,7, 37627-37635
Article type
Paper

Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’

S. Bochmann, A. Fernandez-Pacheco, M. Mačković, A. Neff, K. R. Siefermann, E. Spiecker, R. P. Cowburn and J. Bachmann, RSC Adv., 2017, 7, 37627
DOI: 10.1039/C7RA06734H

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