Three dimensional nano-seeding assembly of ferromagnetic Fe/LaSrFeO4 nano-hetero dot array

Well-ordered ferromagnetic Fe nanodots/LaSrFeO4 nanocomposites have been fabricated by self-assembled crystal growth on La-SrTiO3 substrates having Fe nanoseed array fabricated by nanoimprint lithography (NIL). The Fe nanoseeds with spacing of 200 nm make possible the formation of perfectly arranged...

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Veröffentlicht in:Journal of applied physics 2012-07, Vol.112 (2)
Hauptverfasser: Okada, K., Sakamoto, T., Fujiwara, K., Hattori, A. N., Kanki, T., Tanaka, H.
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Sprache:eng
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Zusammenfassung:Well-ordered ferromagnetic Fe nanodots/LaSrFeO4 nanocomposites have been fabricated by self-assembled crystal growth on La-SrTiO3 substrates having Fe nanoseed array fabricated by nanoimprint lithography (NIL). The Fe nanoseeds with spacing of 200 nm make possible the formation of perfectly arranged Fe/LaSrFeO4 nanocomposites; phase-separated Fe nanodots and the LaSrFeO4 matrix grew only on the nanoseeds and on the area except nanoseeds, respectively. A calculation based on a surface diffusion model has indicated that the nanoseed spacing required for the formation of the perfectly arranged nanocomposite is less than 400 nm. Magnetic force microscopy revealed an arrangement of isolated ferromagnetic domain corresponding to Fe nanodots grown on the Fe nanoseeds. The combination of self-assembled growth and NIL gives a route of the rational formation of high-density ferromagnetic memory devices.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4739719