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

Bochmann S, Fernández-Pacheco A, Mackovic M, Neff A, Siefermann KR, Spiecker E, Cowburn RP, Bachmann J (2017)

Publication Language: English

Publication Type: Journal article

Publication year: 2017

Journal

RSC Advances Royal Society of Chemistry

Book Volume: 7

Pages Range: 37627-37635

URI: http://pubs.rsc.org/en/content/articlepdf/2017/RA/C7RA06734H

DOI: 10.1039/c7ra06734h

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.

Authors with CRIS profile

Sebastian Bochmann Lehrstuhl für Anorganische und Allgemeine Chemie Mirza Mackovic Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Julien Bachmann Lehrstuhl für Chemistry of thin film materials

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM) Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

How to cite

APA:

Bochmann, S., Fernández-Pacheco, A., Mackovic, M., Neff, A., Siefermann, K.R., Spiecker, E.,... Bachmann, J. (2017). Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’. RSC Advances, 7, 37627-37635. https://doi.org/10.1039/c7ra06734h

MLA:

Bochmann, Sebastian, et al. "Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’." RSC Advances 7 (2017): 37627-37635.

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