Direct magnetic patterning due to the generation of ferromagnetism by selective ion irradiation of paramagnetic FeAl alloys

Enric Menéndez, Maciej Oskar Liedke, Jürgen Fassbender, Thomas Gemming, Anja Weber, Laura J. Heyderman, K. V. Rao, Seetharama C. Deevi, Santiago Suriñach, Maria Dolors Baró, Jordi Sort, Josep Nogués

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58 Citations (Scopus)

Abstract

Sub-100-nm magnetic dots embedded in a non-magnetic matrix are controllably generated by selective ion irradiation of paramagnetic Fe60Al 40 (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 (<100nm) having square hysteresis loops with coercivities in excess of μ0HC = 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. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
Original languageEnglish
Pages (from-to)229-234
JournalSmall
Volume5
DOIs
Publication statusPublished - 19 Jan 2009

Keywords

  • Arrays
  • Force microscopy
  • Ion irradiation
  • Magnetic materials
  • Pattern formation

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