Electrically driven phase transition in magnetite nanostructures.

  title={Electrically driven phase transition in magnetite nanostructures.},
  author={SungBae Lee and Alexandra Fursina and J. T. Mayo and Cafer T. Yavuz and Vicki L. Colvin and R G Sumesh Sofin and Igor V. Shvets and Douglas Natelson},
  journal={Nature materials},
  volume={7 2},
Magnetite (Fe3O4), an archetypal transition-metal oxide, has been used for thousands of years, from lodestones in primitive compasses to a candidate material for magnetoelectronic devices. In 1939, Verwey found that bulk magnetite undergoes a transition at TV approximately 120 K from a high-temperature 'bad metal' conducting phase to a low-temperature insulating phase. He suggested that high-temperature conduction is through the fluctuating and correlated valences of the octahedral iron atoms… 
Electronic phase transitions in ultrathin magnetite films.
Th thin film geometries offer unique possibilities to understand the complex interplay of short- and long-range orders in the Verwey transition, additionally offering novel functionalities based on their distinct properties with respect to the bulk form.
Charge Disproportionation and Voltage‐Induced Metal–Insulator Transitions Evidenced in β‐PbxV2O5 Nanowires
The roster of materials exhibiting metal–insulator transitions with sharply discontinuous switching of electrical conductivity close to room temperature remains rather sparse, despite the fundamental
Gate voltage induced phase transition in magnetite nanowires
Since its discovery in 1939 the origin of the phase transition in magnetite (Fe3O4) has been an object of intensive research and great controversy. Here, electrical resistance measurements as a
First-order metal-insulator transition and infrared identification of shape-controlled magnetite nanocrystals.
Well-defined magnetite nanocrystals with controllable size, shape and terminated surface are first employed to elucidate the first-order metal-insulator transition in magnetite, and new discoveries such as a highly suppressed phase transition temperature are identified by monitoring the variable-temperature electric resistance and infrared spectroscopy.
Charge rearrangement in magnetite: from magnetic field induced easy axis switching to femtoseconds electronic processes
Magnetite is the oldest magnet and the first material where the concept of a strong correlations driven metal–insulator transition was suggested and found at TV = 124 K in the so-called Verwey phase
Magnetoresistance and electroresistance effects in Fe3O4 nanoparticle system
Nearly monodisperse spherical magnetite (Fe3O4) nanoparticles are prepared by colloidal chemistry route. Magnetic and electronic transport properties of the annealed pellets of these nanoparticles
Electrical-field-driven metal-insulator transition tuned with self-aligned atomic defects.
A method to experimentally support the anisotropic RS behavior and provide a way to tune the critical switching parameter by introducing self-aligned localized impurities through the growth of Fe3O4 thin films on stepped SrTiO3 substrates.
Competition Between Anti-Phase Boundaries and Charge-Orbital Ordering in Epitaxial Stepped Fe3O4(100) Thin Films
Magnetite is a highly utilized transition metal oxide with many interesting magnetic and transport properties. The presence of anti-phase boundaries (APBs) and charge-orbital ordering (COO) are two
Giant linear magnetoresistance in half-metallic Sr2CrMoO6 thin films
Linear magnetoresistance (LMR) is a special case of a magnetic-field induced resistivity response, which has been reported in highly disordered semiconductor systems and in topological materials. In
Kinetics of the charge ordering in magnetite below the Verwey temperature.
In this work the kinetics of the charge ordering in magnetite (Fe3O4) below the Verwey transition temperature TV is investigated in time and energy domain, suggesting that the charge reordering is driven by correlated hopping transport.


Origin of the Verwey transition in magnetite.
Comprehensive x-ray powder diffraction studies were carried out in magnetite in the 80-150 K and 0-12 GPa ranges with a membrane-driven diamond anvil cell and helium as a pressure medium, showing a reversible, cubic to a distorted-cubic, structural transition.
Current switching of resistive states in magnetoresistive manganites
Magnetoresistive devices (based on, for example, magnetic multilayers) exhibit large changes in electrical resistance in response to a magnetic field, which has led to dramatic improvements in the
Metal-insulator transitions
Metal-insulator transitions are accompanied by huge resistivity changes, even over tens of orders of magnitude, and are widely observed in condensed-matter systems. This article presents the
Magnetite, a model system for mixed-valence oxides, does not show charge ordering.
It is demonstrated the absence of CO along the c axis with the periodicity of either the cubic lattice q=(001) or the doubled cubic lattices q=001/2, which suggests that the Verwey transition is caused by strong electron-phonon interaction instead of an electronic ordering on the octahedral Fe atoms.
Mechanism of the Verwey transition in magnetite: Jahn-Teller distortion and charge ordering patterns.
  • H. Pinto, S. D. Elliott
  • Chemistry, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2006
We have performed density functional calculations with on-site Coulomb repulsion corrections of systems that may be involved in the Verwey transition in magnetite (Fe(3)O(4)). We find that the lowest
Infrared and Raman studies of the Verwey transition in magnetite
We present infrared and Raman measurements of magnetite (Fe3O4). This material is known to undergo a metal-insulator and a structural transition (Verwey transition) at T-V = 120 K. The structural
Hysteretic current–voltage characteristics and resistance switching at a rectifying Ti∕Pr0.7Ca0.3MnO3 interface
We have characterized the vertical transport properties of epitaxial layered structures composed of Pr0.7Ca0.3MnO3(PCMO) sandwiched between SrRuO3(SRO) bottom electrode and several kinds of top
The Verwey transition: a new perspective
This review puts in doubt the classical description of the Verwey (metal?insulator) transition in magnetite on the basis of the wide set of experiments carried out over the last 60 years. We
Charge-orbital ordering and Verwey transition in magnetite.
Local density approximation + Hubbard U (LDA + U) band structure calculations reveal that magnetite (Fe3O4) forms an insulating charge-orbital-ordered state below the Verwey transition temperature, and finds an associated t(2g) orbital ordering on the octahedral Fe2+ sublattice.
Enhancement of the magnetization saturation in magnetite (100) epitaxial films by thermo-chemical treatment
The effect of thermo-chemical treatment on the ease of saturation in a magnetic field of epitaxial magnetite (100) thin films grown on MgO (100) substrates was investigated. It was found that the