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Ordered Iron Oxide Nanotube Arrays Of Controlled Geometry And Tunable Magnetism By Atomic Layer Deposition.

J. Bachmann, J. Jing, M. Knez, S. Barth, Hao Shen, S. Mathur, U. Gösele, K. Nielsch
Published 2007 · Chemistry, Medicine

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Iron oxide nanotubes of 50−150 nm outer diameter and 2−20 nm wall thickness are prepared in ordered arrays. Atomic layer deposition (ALD) of Fe2O3 from the precursor iron(III) tert-butoxide at 130−180 °C yields very smooth coverage of the pore walls of anodic alumina templates, with thickness growth of 0.26(±0.04) A per cycle. The reduced Fe3O4 tubes are hard ferromagnets, and variations of the wall thickness dw have marked consequences on the magnetic response of the tube arrays. For 50 nm outer diameter, tubes of dw = 13 nm yield the largest coercive field (Hc > 750 Oe), whereas lower coercivities are observed on both the thinner and thicker sides of this optimum.
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