Electronic Conduction of Magnetite (Fe3O4) and its Transition Point at Low Temperatures

Verwey, E. J. W.

doi:10.1038/144327b0

Cited by 1,672 publications

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“…At lower temperatures, the magnetic hystereses widen, an approximate doubling in coercive field being usually observed between 300 and 5 K ( Figure S2). Temperaturedependent magnetization data ( Figure S4) do not show any abrupt change indicative of a crystallographic phase transition (Verwey transition), 12 an observation consistent with a glassy structural state.…”

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confidence: 76%

Ordered Iron Oxide Nanotube Arrays of Controlled Geometry and Tunable Magnetism by Atomic Layer Deposition

et al. 2007

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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) Å per cycle. The reduced Fe3O4 tubes are hard ferromagnets, and variations of the wall thickness d w have marked consequences on the magnetic response of the tube arrays. For 50 nm outer diameter, tubes of d w = 13 nm yield the largest coercive field (H c > 750 Oe), whereas lower coercivities are observed on both the thinner and thicker sides of this optimum.

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confidence: 76%

Ordered Iron Oxide Nanotube Arrays of Controlled Geometry and Tunable Magnetism by Atomic Layer Deposition

et al. 2007

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“…The Verwey transition in magnetite, which is a first-order crystallographic phase transition, has been studied extensively since its discovery (Verwey, 1939) because of its enormous impact on the magnetic and other physical properties of the material (Walz, 2001). The Verwey transition is associated with an order-of-magnitude increase in magnetocrystalline anisotropy and a change in magnetic easy axis from cubic <111> to monoclinic [001] below ~120 K. Although numerous studies have suggested that magnetic domain walls in magnetite can interact with the ferroelastic twin walls that form at low temperature (e.g., Smirnov & Tarduno, 2002), no direct evidence for such interactions has previously been presented.…”

Section: Low-temperature Magnetic Propertiesmentioning

confidence: 99%

Electron Holography of Magnetic Materials

Kasama¹,

Dunin‐Borkowski²,

Beleggia³

2011

Holography - Different Fields of Application

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“…Magnetite also undergoes another Verwey transition at T V ~ 120 K, where the charge ordering between Fe 2+ and Fe 3+ has been observed below T V [14].…”

Section: Introductionmentioning

confidence: 99%

Interparticle interaction and size effect in polymer coated magnetite nanoparticles

Thakur

Giri

et al. 2006

J. Phys.: Condens. Matter

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Magnetization and Mössbauer studies have been performed on the polymer coated magnetite nanoparticles with particle size from 5.1 to 14.7 nm. The maximum in the temperature dependence of magnetization (T M ) is found to be inconsistent with the particle size (D TEM ). The effective magnetic anisotropy (K an ) is found to increase with the decrease of D TEM , which is attributed to the increase of surface anisotropy. The absence of coercivity and remanence of magnetization noticed well above T M indicates the superparamagnetic behaviour, which has also been observed in the temperature dependent Mössbauer results. The temperature dependence of hyperfine field is found to follow similar dependence of saturation magnetization for bulk magnetite.

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Electronic Conduction of Magnetite (Fe3O4) and its Transition Point at Low Temperatures

Cited by 1,672 publications

References 4 publications

Ordered Iron Oxide Nanotube Arrays of Controlled Geometry and Tunable Magnetism by Atomic Layer Deposition

Ordered Iron Oxide Nanotube Arrays of Controlled Geometry and Tunable Magnetism by Atomic Layer Deposition

Electron Holography of Magnetic Materials

Interparticle interaction and size effect in polymer coated magnetite nanoparticles

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