Browsing by Author "VENKATESAN, MUNUSWAMY"
Now showing items 1-20 of 42
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Biaxial strain-induced transport property changes in atomically tailored SrTiO3 -based systems
COEY, JOHN; VENKATESAN, MUNUSWAMY (2014)Several metallic SrTiO3-based systems, including reduced SrTiO3−δ, Nb-doped SrTiO3, and two-dimensional electron gas at the LaAlO3/SrTiO3(001) interface, have been epitaxially fabricated on various substrates inducing ... -
Conducting channel at the LaAlO3/SrTiO3 interface
COEY, JOHN; VENKATESAN, MUNUSWAMY (2013)Localization of electrons in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface is investigated by varying the channel thickness in order to establish the nature of the conducting channel. Layers of SrTiO3 ... -
Conventional and inverse magnetocaloric effects in La(0.45)Sr(0.55)MnO(3) nanoparticles
COEY, JOHN; VENKATESAN, MUNUSWAMY (2011)The magnetocaloric effect of La(0.45)Sr(0.55)MnO(3) nanoparticles was studied by dc magnetization measurements. A sample with mean particle size of about 140 nm exhibits both a conventional magnetocaloric effect around the ... -
Cooling-field dependence of exchange bias effect in La 0.45Sr0.55MnO3 nanoparticles
COEY, JOHN; VENKATESAN, MUNUSWAMY (2014)Magnetic properties of 16 nm La0.45Sr0.55MnO3 nanoparticles exhibit superparamagnetic blocking at 160 K with a ferromagnetic moment appearing in the antiferromagnetic state. The exchange interaction at the interface between ... -
Cubic Mn 2 Ga Thin films: Crossing the spin gap with ruthenium
COEY, JOHN; VENKATESAN, MUNUSWAMY; RODE, KARSTEN; STAMENOV, PLAMEN (2014)Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, with Curie temperature TC = 225 K and magnetization Ms=280 kA m−1, equivalent to 1.65μB per ... -
Diameter-modulated ferromagnetic CoFe nanowires
COEY, JOHN; VENKATESAN, MUNUSWAMY (2013)Highly ordered nanoporous anodic aluminium oxide templates with uniform or periodically modulated pore diameters have been fabricated by the hard-pulse anodization technique. Straight and diameter-modulated CoFe nanowires ... -
Effects of Fe, Cu, Zr, and Ti on the magnetic properties of SmCo-1:7 magnets
VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (IEEE, 2002)The effect of Fe, Cu, Zr, and Ti substitution on magnetic properties of SmCo 1 : 7 magnets at temperatures up to 500 C were studied. As-milled amorphous Sm(Co,Fe,Cu,Ti???Zr)7 magnets crystallized in the TbCu7-type ... -
Enhanced energy product in Y-Co-Fe magnets intermediate between Nd-Fe-B and ferrite
COEY, JOHN; VENKATESAN, MUNUSWAMY (2015)The hysteresis of ball-milled Fe-doped YCo5 powder has been optimized by controlling the temperature and time for rapid annealing under vacuum and argon. The crystallite size is only 25 nm; yet, it has been possible to ... -
Exchange-biased magnetic tunnel junctions with antiferromagnetic epsilon-Mn3Ga
RODE, KARSTEN; VENKATESAN, MUNUSWAMY; STAMENOV, PLAMEN; COEY, JOHN (2012)Oriented c-axis films of the hexagonal triangular antiferromagnetic ?-Mn3Ga have been used in bottom-pinned synthetic antiferromagnetmagnetic tunnel junctions with MgO barriers, which show up to 150% tunneling magnetoresistance ... -
Exploring the coordination chemistry of bifunctional organoarsonate ligands: Syntheses and characterisation of coordination polymers that contain 4-(1,2,4-triazol-4-yl)phenylarsonic acid
VENKATESAN, MUNUSWAMY (2014)This account describes the coordination chemistry of a novel bifunctional arsonic acid ligand, 4-(1,2,4-triazol-4-yl)phenylarsonic acid (H2TPAA) that contains a triazole group. Hydrothermal reactions of transition metal ... -
A facile "bottom-up" approach to prepare free-standing nano-films based on manganese coordination clusters
VENKATESAN, MUNUSWAMY (2013)We present herein a novel method to prepare free-standing Dried Foam Films (DFFs) whereby individual polynuclear manganese complexes cover quantitatively the holes of micro-grids; the fabricated, homogeneous films have a ... -
Ferromagnetism in defect-ridden oxides and related materials
COEY, JOHN; VENKATESAN, MUNUSWAMY; STAMENOV, PLAMEN (2010)The existence of high-temperature ferromagnetism in thin films and nanoparticles of oxides containing small quantities of magnetic dopants remains controversial. Some regard these materials as dilute magnetic semiconductors, ... -
Ferromagnetism in Fe-doped SnO2 thin films
VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Physical Society, 2004)Thin films grown by pulsed-laser deposition from targets of Sn0.95Fe0.05O2 are transparent ferromagnets with Curie temperature and spontaneous magnetization of 610 K and 2.2?A?m2?kg?1, respectively. The 57Fe Mossbauer ... -
Hetero-metallic, functionalizable polyoxomolybdate clusters: Via a "top-down" synthetic method
SCHMITT, WOLFGANG; GUNNLAUGSSON, THORFINNUR; VENKATESAN, MUNUSWAMY (2017) -
Hierarchical elasticity of bimesogenic liquid crystals with twist-bend nematic phase
VIJ, JAGDISH; VENKATESAN, MUNUSWAMY (2015)in 2001, Dozov predicted that twist-bend nematic phase can be spontaneously formed when K 33 < 0 and K 11/K 22 > 2, and this phase has recently been discovered in bimesogens. To verify Dozov's hypothesis, we have measured ... -
High field magneto-transport in two-dimensional electron gas LaAlO<inf>3</inf>/SrTiO<inf>3</inf>
COEY, JOHN; VENKATESAN, MUNUSWAMY (2016)The transport properties of the complex oxide LaAlO 3 /SrTiO 3 interface are investigated under a high magnetic field (55 T). Small oscillations of the magnetoresistance with altered periodicity are observed when ... -
High spin polarization in epitaxial films of ferrimagnetic Mn3Ga
COEY, JOHN; VENKATESAN, MUNUSWAMY; RODE, KARSTEN; STAMENOV, PLAMEN (2011)Ferrimagnetic Mn3Ga exhibits a unique combination of low saturation magnetization (Ms=0.11 MA m−1) and high perpendicular anisotropy with a uniaxial anisotropy constant of Ku = 0.89 MJ m−3. Epitaxial c-axis films exhibit ... -
Influence of an Au capping layer on the magnetic properties of CoPt nanowires
COEY, JOHN; BYRNE, FIONA; MONZON, LORENA; STAMENOV, PLAMEN; VENKATESAN, MUNUSWAMY (2011)Equiatomic CoPt nanowires with a gold cap layer have been fabricated by electrochemical template synthesis. Au improves the structural and magnetic properties of the L10 ordered CoPt, leading to coercivities of up to 1.43 ... -
Integrain magnetoresistance in electron-doped Sr2FeMoO6
VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (IEEE, 2002)Electron-doped double perovskite compounds (Sr2 La )FeMoO6 ( = 0 0 0 5 0 7) were synthesized by combustion synthesis using Oxalic acid dihydrazide as fuel. There is an increase in Curie temperature ( ) with La substitution ... -
Long-range magnetic coupling across a polar insulating layer
COEY, JOHN; VENKATESAN, MUNUSWAMY (2016)Magnetic interactions in solids are normally mediated by short-range exchange or weak dipole fields. Here we report a magnetic interaction that can propagate over long distances (∼10 nm) across a polar insulating oxide ...