Systematic tuning of segmented magnetic nanowires into three-dimensional arrays of ‘bits’
| Autor: | Andreas Neff, Mirza Mačković, Amalio Fernández-Pacheco, Julien Bachmann, Erdmann Spiecker, Russell P. Cowburn, Katrin R. Siefermann, Sebastian Bochmann |
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| Přispěvatelé: | Fernandez-Pacheco, Amalio [0000-0002-3862-8472], Apollo - University of Cambridge Repository |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
34 Chemical Sciences Magnetic domain business.industry Magnetometer General Chemical Engineering Nanowire Nanotechnology 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Magnetocrystalline anisotropy 01 natural sciences Nanomagnet law.invention Condensed Matter::Materials Science Transmission electron microscopy law 0103 physical sciences Microscopy Optoelectronics Magnetic force microscope 010306 general physics 0210 nano-technology business |
| Zdroj: | RSC Advances. 7:37627-37635 |
| ISSN: | 2046-2069 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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