Journal ArticleDOI
Transport and magnetic properties of epitaxial and polycrystalline magnetite thin films
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TLDR
The transport and magnetic properties of magnetite (Fe3O4) thin films grown epitaxially on single crystal MgO(100) and SrTiO3 (100) substrates, and with multiple grain orientations on polycrystalline Sr TiO3 substrates have been investigated in this paper.Abstract:
The transport and magnetic properties of magnetite (Fe3O4) thin films grown epitaxially on single crystal MgO(100) and SrTiO3(100) substrates, and with multiple grain orientations on polycrystalline SrTiO3 substrates, have been investigated. The films are grown using pulsed laser deposition and their epitaxial quality determined using ion channeling measurements. Transport and magnetic studies of Fe3O4 films as a function of thickness and morphology suggest that epitaxial strain and growth defects affect the width and temperature of the Verwey transition. In addition, these factors also significantly influence the magnetic coercivity of the films. The low-field magnetoresistance (MR) behaviors of epitaxial and polycrystalline films as a function of temperature have been compared and they were found to be quite similar, suggesting very small contribution to the MR from grain boundaries.read more
Citations
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Journal ArticleDOI
Monodisperse MFe2O4 (M = Fe, Co, Mn) Nanoparticles
Shouheng Sun,Hao Zeng,David B. Robinson,Simone Raoux,Philip M. Rice,Shan X. Wang,Guanxiong Li +6 more
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Ferromagnetic materials
TL;DR: In this paper, the authors restrict their attention to the ferrites and a few other closely related materials, which are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present.
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Advances in the growth and characterization of magnetic, ferroelectric, and multiferroic oxide thin films
TL;DR: The growth and characterization of functional oxide thin films that are ferroelectric, magnetic, or both at the same time are reviewed in this article, where the evolution of synthesis techniques and how advances in in situ characterization have enabled significant acceleration in improvements to these materials are described.
Journal ArticleDOI
Extrinsic magnetotransport phenomena in ferromagnetic oxides
TL;DR: In this article, a review of extrinsic magnetotransport effects in ferromagnetic oxides is presented, focusing on grain-boundary, tunnelling and domain-wall magnetoresistance.
Journal ArticleDOI
Magnetite (Fe3O4) Core−Shell Nanowires: Synthesis and Magnetoresistance
Daihua Zhang,Zuqin Liu,Song Han,Chao Li,Bo Lei,Michael P. Stewart,James M. Tour,Chongwu Zhou +7 more
TL;DR: In this paper, high quality MgO/Fe3O4 core−shell nanowires have been successfully synthesized by depositing an epitaxial shell of Fe 3O4 onto single crystal MgOs.
References
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Ferromagnetic materials
TL;DR: In this paper, the authors restrict their attention to the ferrites and a few other closely related materials, which are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present.
Journal ArticleDOI
Anomalous moment and anisotropy behavior in Fe3O4 films.
D. T. Margulies,F. T. Parker,Frederick E. Spada,Rachel Goldman,J. Li,Robert Sinclair,Ami E. Berkowitz +6 more
TL;DR: In this paper, an anomalous out-of-plane moment distribution was observed in the CEMS spectra for films grown on all substrates, although the moments are expected to be in the plane of the film due to the large shape anisotropy.
Journal ArticleDOI
Low-field magnetoresistive properties of polycrystalline and epitaxial perovskite manganite films
TL;DR: The low-field magnetoresistance properties of polycrystalline La0.67Sr0.33MnO3 and La 0.67CaO33MnsO3 thin films with different grain sizes have been investigated and compared with epitaxial films as discussed by the authors.
Journal ArticleDOI
Magnetoresistance and magnetic properties of epitaxial magnetite thin films
TL;DR: In this article, the magnetoresistance (MR) exhibits a peak around the Verwey transition, and the MR values as high as 32% have been observed for a 6600-AA{}-thick film at 60 K under a 4-T field.
Journal ArticleDOI
Charge ordering in magnetite at low temperatures.
TL;DR: In this article, the authors compared ten independent charge-ordering models (including the Verwey model) for the low-temperature structure that satisfy the Anderson condition if the symmetry is Cc (monoclinic).