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Vv, Gridin; Gr, Hearne; Jm, Honig

doi:10.1103/physrevb.53.15518

Cited by 68 publications

(41 citation statements)

References 19 publications

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“…A sharp narrow negative MR peak is normally observed at the Verwey point in single crystal F 3 O 4 [79,113]. In our samples, the MR ratio continuously increases with decreasing temperature before the Verwey transition ( Fig.…”

Section: Tunneling Magnetroresistance and Spin Polarization In Fe 3 Osupporting

confidence: 60%

“…Various studies have focused on the MR ratio in Fe 3 O 4 of different forms including epitaxial and polycrystalline films, powders, and tunnel junctions [39,[79][80][81][82]. In early reports, some groups have claimed a large MR response on breaking contact of two microscaled single crystals of magnetite [83] and thin film structure composed of a few stacked monolayers of organically encapsulated magnetite nanocrystals [84].…”

Section: Tunneling Magnetroresistance and Spin Polarization In Fe 3 Omentioning

confidence: 99%

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Tailoring the Interface Properties of Magnetite for Spintronics

Parkinson¹,

Diebold²,

Tang³

et al. 2012

Advanced Magnetic Materials

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Section: Tunneling Magnetroresistance and Spin Polarization In Fe 3 Osupporting

confidence: 60%

Section: Tunneling Magnetroresistance and Spin Polarization In Fe 3 Omentioning

confidence: 99%

Tailoring the Interface Properties of Magnetite for Spintronics

Parkinson¹,

Diebold²,

Tang³

et al. 2012

Advanced Magnetic Materials

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“…The increase in MR at the Verwey transition is not unusual and is reported by several other researchers in thin films and bulk single crystal of magnetite. 26,27,39 To explain the presence of MR peak in the vicinity of Verwey transition, Girdin and co-workers 39 used the established facts regarding the transport in Fe 3 O 4 and thermodynamic arguments related to the Verwey transition. Tracing the discontinuous changes in enthalpy and entropy with resistivity, they proposed that the jump in MR can be described as * = ⌬MH / k B ␦T 1/2 , where ⌬M is the change in magnetization across T v and ␦T 1/2 is the full-width at half maximum of the MR peak at T v .…”

Section: Resultsmentioning

confidence: 99%

Magnetoresistance enhancement in epitaxial magnetite films grown on vicinal substrates

2005

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The magnetoresistance ͑MR͒ behavior of epitaxial magnetite Fe 3 O 4 grown on low-vicinal ͑small miscut͒ and high-vicinal ͑large miscut͒ MgO substrates is compared. Magnetization measurements on Fe 3 O 4 films on high-vicinal substrates showed reduced magnetic moment as compared with the films grown on low-vicinal MgO, which correlates well with the expected reduction in magnetic moment due to step edge induced additional antiphase boundaries ͑APBs͒ with out-of-plane shift vectors. The MR is significantly higher ͑12.3% at 2 T͒ for a 45 nm Fe 3 O 4 film on high-vicinal substrate than that observed ͑7.2% at 2 T͒ for a film on low-vicinal substrate. A strong anisotropy in the MR is observed in correlation with the direction of atomic step edges. In addition to the increase in MR, the field dependency of the MR is also modified. The observed modification in the magnetotransport behavior of epitaxial Fe 3 O 4 films is attributed to an enhanced spin scattering arising due to the presence of atomic height steps that lead to the formation of a greater density of antiferromagnetically coupled APBs.

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“…[3][4][5] Many studies have focused on the MR ratio in the magnetite of different forms including epitaxial and polycrystalline films, powders, and tunnel junctions. [6][7][8][9][10] Unfortunately, in most cases the MR ratio is much smaller than expected, especially at room temperature. In fact, it is well known that in polycrystalline specimens and powder compacts of magnetite, the surfaces or interfaces at the grain boundaries have rather different magnetic properties and reduced spin polarization than the bulk.…”

Section: Introductionmentioning

confidence: 88%

Enhanced spin-dependent tunneling magnetoresistance in magnetite films coated by polystyrene

Wang

Małkiński

Tang

2007

Journal of Applied Physics

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Hematite films were deposited by magnetron sputtering. A phase transformation from hematite to magnetite occurred when polystyrene ͑PS͒ coated hematite films were annealed above 200°C in hydrogen flow. Giant negative magnetoresistance ͑MR͒ was observed with the best MR ratio of over 8% ͑at room temperature and in a field of 5.5 T͒ found in samples annealed at 230°C. The temperature dependence of the resistivity is characteristic of intergranular tunneling. After the PS layer was removed and the films annealed again at 230°C in hydrogen flow, the resistivity increased by about one order of magnitude and the MR ratio decreased to 4.3%. These data show that PS coating layer can protect magnetite films from oxidation and enhance interganular spin-dependent tunneling magnetoresistance.

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Magnetoresistance extremum at the first-order Verwey transition in magnetite (Fe3O4

Cited by 68 publications

References 19 publications

Tailoring the Interface Properties of Magnetite for Spintronics

Tailoring the Interface Properties of Magnetite for Spintronics

Magnetoresistance enhancement in epitaxial magnetite films grown on vicinal substrates

Enhanced spin-dependent tunneling magnetoresistance in magnetite films coated by polystyrene

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