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Magnetization switching in high-density magnetic nanodots by a fine-tune sputtering process on large area diblock copolymer mask

Abstract

Ordered magnetic nanodot arrays with extremely high density provide unique properties to the still growing field of nanotechnology. To overcome size limits of conventional lithography, a fine-tuned sputtering deposition process mesopores polymeric template fabricated by diblock copolymer self-assembly is here proposed to fabricate uniform and densely spaced nanometer-scale magnetic dot arrays. This process has been successfully exploited to pattern, over a large area, sputtered Ni80Fe20 and Co thin films with thickness of 10 and 13 nm, respectively. A carefully tuned sputter-etching at a suitable glancing angle has been performed in order to selectively remove the magnetic material deposited on top of the polymeric template, ending up with nanodot arrays (dot diameter of about 17 nm). A detailed study of magnetization reversal at room temperature as a function of sputter-etching time together with morphology investigations have been performed to confirm the synthesis of long-range ordered arrays displaying functional magnetic properties. Magnetic hysteresis loops of the obtained nanodot arrays have been measured at different temperatures and interpreted by means of micromagnetic simulations to explore the role of dipole-dipole magnetostatic interactions between dots and the effect of magnetocrystalline anisotropy. The agreement between measurement and numerical modelling results addresses the use of the proposed synthesis technique as an innovative process to design large-area nanoscale arrays of functional magnetic elements.

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Publication details

The article was received on 15 Jun 2017, accepted on 12 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR04295G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Magnetization switching in high-density magnetic nanodots by a fine-tune sputtering process on large area diblock copolymer mask

    G. Barrera, F. Celegato, M. Coisson, A. Manzin, F. Ferrarese Lupi, G. Seguini, L. Boarino, G. Aprile, M. Perego and P. Tiberto, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04295G

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