Browsing Physics (Scholarly Publications) by Author "ARORA, SUNIL"
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Anomalous strain relaxation behaviour of Fe3O4/MgO (100) heteroepitaxial system grown using molecular beam epitaxy
SHVETS, IGOR; ARORA, SUNIL (2006)Strain relaxation studies in epitaxial magnetite (Fe3O4) thin films grown on MgO (100) substrates using high-resolution x-ray diffraction and cross-sectional transmission electron microscopy reveal that the films remain ... -
Antiferromagnetic interlayer exchange coupling between Fe3O4 layers across a nonmagnetic MgO dielectric layer
SHVETS, IGOR; WU, HAN-CHUN; ARORA, SUNIL (2008)We have investigated the interlayer exchange coupling between the epitaxial spinel Fe3O4 layers across an insulating nonmagnetic MgO spacer. The epitaxial structure used for these investigations was Fe3O4 (10?nm)/MgO ... -
Concept of a nanowire array magnetoresistance device
SHVETS, IGOR; MURPHY, SHANE; ARORA, SUNIL (2008)We describe a concept of the magnetoresistive medium comprising of a planar array of intermingled nanowires with pinned and unpinned magnetic moments. We propose a bottom up method of forming the medium and demonstrate the ... -
Giant magnetic moment in epitaxial Fe3O4 thin films on MgO (100)
SHVETS, IGOR; ARORA, SUNIL; WU, HAN-CHUN (2008)Magnetization studies on well characterized epitaxial magnetite (Fe3O4) thin films grown on MgO(100) show that the ultrathin films (<5?nm thickness) are ferromagnetic and their magnetic moments are much greater than those ... -
Influence of antiphase boundary density on the conduction noise properties of epitaxial magnetite thin films
SHVETS, IGOR; ARORA, SUNIL (2005)Low frequency conduction noise (1/f noise) properties of epitaxial magnetite (Fe3O4) thin films having a varying density of antiphase boundaries (APBs) were investigated as a function of temperature and frequency. Temperature ... -
Influence of miscut direction on magnetic anisotropy of magnetite films grown on vicinal MgO (100)
SHVETS, IGOR; ARORA, SUNIL; RAMOS, RAFAEL (American Institute of Physics, 2010)Ferromagnetic resonance (FMR) was used to study the influence of miscut direction on the in-plane fourfold and uniaxial magnetic anisotropies of epitaxial Fe3O4 films grown on vicinal MgO (100) surfaces. In-plane angular ... -
Large magnetorefractive effect in magnetite
ARORA, SUNIL; RAMOS, RAFAEL; SHVETS, IGOR (2010)We carried out a magneto-optical spectroscopic study of magnetite (Fe3O4) thin films and single crystals at optical wavelengths. We observed a relevant quadratic magneto-optic contribution that can be notably larger than ... -
Magnetic Properties of Ultrathin Magnetite Films Grown by Molecular Beam Epitaxy
SHVETS, IGOR; ARORA, SUNIL; WU, HAN-CHUN (IEEE-INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS INC, 2008)Magnetic properties as a function of film thickness (2-55 nm) for magnetite (Fe3O4) thin films grown on MgO (100) substrates show that the small thickness films (les 5 nm) are ferromagnetic and possess magnetization values ... -
Magnetoelectric properties of BixCo2-xMnO4 (0<= x <=0.3)
SHVETS, IGOR; ARORA, SUNIL (2008)We present the structural, dielectric and magnetization study of single phase polycrystalline BixCo2?xMnO4 (0 ? x ? 0.3), synthesized by a conventional solid state route. All the samples have the cubic spinel structure ... -
Magnetoresistance enhancement in epitaxial magnetite films grown on vicinal substrates
SHVETS, IGOR; ARORA, SUNIL (2005)The magnetoresistance MR behavior of epitaxial magnetite Fe3O4 grown on low-vicinal small miscut and high-vicinal large miscut MgO substrates is compared. Magnetization measurements on Fe3O4 films on high-vicinal ... -
Positive antiphase boundary domain wall magnetoresistance in Fe3O4 (110) heteroepitaxial films
SHVETS, IGOR; ARORA, SUNIL (2011)We observe a strong crystallographic direction dependence on the low-field magnetoresistance (MR) behavior of the epitaxial Fe3O4 (110) films grown on MgO (110) substrates. The sign of MR is positive when the current and ... -
Strain relaxation in Fe3O4/MgAl2O4 heterostructures: Mechanism for formation of antiphase boundaries in an epitaxial system with identical symmetries of film and substrate
SHVETS, IGOR; ARORA, SUNIL (2009)Strain relaxation studies in epitaxial magnetite, Fe3O4, thin films grown on MgAl2O4 100 substrates are reported. The study shows that the films were relaxed in line with the theoretical model prediction with a critical ... -
Strain relaxation studies of the Fe3O4/MgO (100) heteroepitaxial system grown by magnetron sputtering
SHVETS, IGOR; ARORA, SUNIL (2004)Detailed strain relaxation studies of epitaxial magnetite, Be3O4, films on MgO(100) substrates grown by magnetron sputtering reveal the accommodation of strain up to 600 nm thickness, a thickness far above the critical ... -
Study of magnetoresistance of epitaxial magnetite films grown on vicinal MgO (100) substrate
SHVETS, IGOR; ARORA, SUNIL (2005)The magnetoresistance sMRd studies of magnetite thin films deposited on vicinal MgO substrates show an enhanced MR along the miscut direction as compared to the direction perpendicular to it. The MR anisotropy increases ...