Thermal Diffusivity of&amp;lt;tex&amp;gt;$hbox Fe_3-xhbox Zn_xhbox O_4$&amp;lt;/tex&amp;gt;at the Verwey Transition

Salazar, A.; Oleaga, A.; Wiecheć, A.; Tarnawski, Z.; Kozłowski, A.

doi:10.1109/tmag.2004.830190

Cited by 3 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We estimated a SSE coefficient (S zy ) at this temperature of about 52 ± 12 nV/K. It can be observed that there is a reduction of the SSE compared to the value observed at 300 K, this could be possibly related to the changes induced by the Verwey transition on the thermal 35,36 and magnetic 37,38 properties of the film, which can affect the thermal spin pumping at the Fe 3 O 4 /Pt interface and therefore the observed SSE signal.…”

mentioning

confidence: 78%

Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films

Ramos

Kikkawa

Uchida

et al. 2013

Applied Physics Letters

171

160

View full text Add to dashboard Cite

We report the first experimental observation of the spin Seebeck effect in magnetite thin films. The signal observed at temperatures above the Verwey transition is a contribution from both the anomalous Nernst (ANE) and spin Seebeck effects (SSE). The contribution from the ANE of the Fe3O4 layer to the SSE is found to be negligible due to the resistivity difference between Fe3O4 and Pt layers. Below the Verwey transition the SSE is free from the ANE of the ferromagnetic layer and it is also found to dominate over the ANE due to magnetic proximity effect on the Pt layer.Comment: 13 pages, 3 figure

show abstract

mentioning

confidence: 78%

Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films

Ramos

Kikkawa

Uchida

et al. 2013

Applied Physics Letters

171

160

View full text Add to dashboard Cite

show abstract

“…To measure the temperature hysteresis of the transition, very precise heat capacity studies were performed on the stoichiometric sample [6]; we are certain that the hysteresis of the Verwey transition exist and it does not exceed 0.03 K. Several artifact reports in the literature claiming larger hysteresis for stoichiometric magnetite may easily be caused by not properly taking into account the huge heat capacity at the transition (and the large anomaly in heat conduction [8]): the thermometer reflects the probe properties of the heater rather than the sample temperature. To estimate the hysteresis in zinc doped magnetite, where the heat capacity is much lower and the anomaly in heat transfer is not so pronounced, the samples were heated with the current passing through them (as opposed to heating with the probe heater that could bring about erroneous temperature reading) in several stages of the transition.…”

Section: Resultsmentioning

confidence: 99%

Magnetic and structural studies of magnetite at the Verwey transition

Tabiś

Tarnawski

Ka̧kol

et al. 2007

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Electrically driven phase transition in magnetite nanostructures

et al. 2007

View full text Add to dashboard Cite

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, and that the transition is the onset of charge ordering on cooling. The Verwey transition mechanism and the question of charge ordering remain highly controversial. Here, we show that magnetite nanocrystals and single-crystal thin films exhibit an electrically driven phase transition below the Verwey temperature. The signature of this transition is the onset of sharp conductance switching in high electric fields, hysteretic in voltage. We demonstrate that this transition is not due to local heating, but instead is due to the breakdown of the correlated insulating state when driven out of equilibrium by electrical bias. We anticipate that further studies of this newly observed transition and its low-temperature conducting phase will shed light on how charge ordering and vibrational degrees of freedom determine the ground state of this important compound.

show abstract

Thermal Diffusivity of<tex>$hbox Fe_3-xhbox Zn_xhbox O_4$</tex>at the Verwey Transition

Cited by 3 publications

References 16 publications

Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films

Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films

Magnetic and structural studies of magnetite at the Verwey transition

Electrically driven phase transition in magnetite nanostructures

Contact Info

Product

Resources

About