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Direct Magnetic Patterning due to the Generation of Ferromagnetism by Selective Ion Irradiation of Paramagnetic FeAl Alloys
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2009 (English)Article in journal (Refereed) Published
Abstract [en]

Sub-100-nm magnetic dots embedded in a non-magnetic matrix are controllably generated by selective ion irradiation of paramagnetic Fe60Al40 (atomic %) alloys, taking advantage of the disorder-induced magnetism in this material. The process is demonstrated by sequential focused ion beam irradiation and by in-parallel broad-beam ion irradiation through lithographed masks. Due to the low fluences used, this method results in practically no alteration of the surface roughness. The dots exhibit a range of magnetic properties depending on the size and shape of the structures, with the smallest dots (<100 nm) having square hysteresis loops with coercivities in excess of mu H-0(C) = 50 mT Importantly, the patterning can be fully removed by annealing. The combination of properties induced by the direct magnetic patterning is appealing for a wide range of applications, such as patterned media, magnetic separators, or sensors.

Place, publisher, year, edition, pages
2009. Vol. 5, no 2, 229-234 p.
Keyword [en]
arrays, force microscopy, ion irradiation, magnetic materials, pattern, formation, intermetallic compound, atomic disorder, tailoring magnetism, beam, irradiation, thin-films, percent al, arrays, media, ga, amorphization
URN: urn:nbn:se:kth:diva-18151DOI: 10.1002/smll.200800783ISI: 000263088700013ScopusID: 2-s2.0-59449090366OAI: diva2:336197
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-02-02Bibliographically approved

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Rao, K. Venkat
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Engineering Material Physics

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