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Title: Energy based model for temperature dependent behavior of ferromagnetic materials

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1413838
Grant/Contract Number:
AC05-06OR23177
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 426; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-18 17:58:39; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Sah, Sanjay, and Atulasimha, Jayasimha. Energy based model for temperature dependent behavior of ferromagnetic materials. Netherlands: N. p., 2017. Web. doi:10.1016/j.jmmm.2016.10.152.
Sah, Sanjay, & Atulasimha, Jayasimha. Energy based model for temperature dependent behavior of ferromagnetic materials. Netherlands. doi:10.1016/j.jmmm.2016.10.152.
Sah, Sanjay, and Atulasimha, Jayasimha. Wed . "Energy based model for temperature dependent behavior of ferromagnetic materials". Netherlands. doi:10.1016/j.jmmm.2016.10.152.
@article{osti_1413838,
title = {Energy based model for temperature dependent behavior of ferromagnetic materials},
author = {Sah, Sanjay and Atulasimha, Jayasimha},
abstractNote = {},
doi = {10.1016/j.jmmm.2016.10.152},
journal = {Journal of Magnetism and Magnetic Materials},
number = C,
volume = 426,
place = {Netherlands},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jmmm.2016.10.152

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  • Abstract not provided.
  • The ferromagnetic transition temperature (T{sub c}) of a two-band double-exchange (DE) model for colossal magnetoresistance materials is studied using dynamical mean-field theory in wide ranges of coupling constants, hopping parameters, and carrier densities. The results are shown to be in good agreement with Monte Carlo simulations. When the bands overlap, the value of T{sub c} is found to be much larger than in the one-band case, for all values of the chemical potential within the energy overlap interval. A nonzero off-diagonal hopping produces an additional boost of T{sub c}, showing the importance of these terms, as well as the concomitantmore » use of multiband models, to increase the critical temperatures in DE-based theories.« less
  • No abstract prepared.
  • InN/GaN heterostructure based Schottky diodes were fabricated by plasma-assisted molecular beam epitaxy. The temperature dependent electrical transport properties were carried out for InN/GaN heterostructure. The barrier height and the ideality factor of the Schottky diodes were found to be temperature dependent. The temperature dependence of the barrier height indicates that the Schottky barrier height is inhomogeneous in nature at the heterostructure interface. The higher value of the ideality factor and its temperature dependence suggest that the current transport is primarily dominated by thermionic field emission (TFE) other than thermionic emission (TE). The room temperature barrier height obtained by using TEmore » and TFE models were 1.08 and 1.43 eV, respectively.« less
  • Linking of trinuclear pivalate Fe{sub 2}NiO(Piv){sub 6} (Piv=O{sub 2}CC(CH{sub 3}){sub 3}) by 2,6-bis(4-pyridyl)-4-(1-naphthyl)pyridine (L) resulted in formation of 1D-porous coordination polymer Fe{sub 2}NiO(Piv){sub 6}(L)·Solv, which was characterized in two forms: DMSO solvate Fe{sub 2}NiO(Piv){sub 6}(L)(DMSO)·2.5DMSO (1) or water solvate Fe{sub 2}NiO(Piv){sub 6}(L)(H{sub 2}O) (2). X-ray structure of 1 was determined. Crystal lattice of 1 at 160 K contained open channels, filled by captured solvent, while temperature growth to 296 K led to the crystal lattice rearrangement and formation of closed voids. Redox-behavior of 2 was studied by cyclic voltammetry for a solid compound, deposited on glassy-carbon electrode. Redox-activity of Lmore » preserved upon incorporation in the coordination polymer. The presence of pores in desolvated sample Fe{sub 2}NiO(Piv){sub 6}(L) was confirmed by the measurements of N{sub 2} and H{sub 2} adsorption at 77 K. Potential barriers of the different molecules diffusion through pores were estimated by the means of molecular mechanics. - Graphical abstract: Redox-behavior of 1D-porous coordination polymer Fe{sub 2}NiO(Piv){sub 6}(L)(H{sub 2}O) was studied by cyclic voltammetry in thin film, deposited on glassy-carbon electrode. Redox-activity of L preserved upon incorporation in the coordination polymer. Potential barriers of different molecules diffusion through pores were estimated by the means of molecular mechanics. - Highlights: • Porous 1D coordination polymer was synthesized. • Temperature growth led to pores closing due to crystal lattice rearrangement. • Redox-activity of ligand preserved upon incorporation into coordination polymer. • Redox-properties of solid coordination polymer were studied in thin film. • Diffusion barriers were evaluated by molecular mechanics.« less