Browsing Physics (Scholarly Publications) by Author "VENKATESAN, MUNUSWAMY"
Now showing items 21-39 of 39
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Magnetic properties of mechanically-alloyed Sm-Co nanophase hard magnets
(IEEE, 2001)Highly coercive Sm14Co86 powders were prepared by mechanical alloying with a view to enhance the high temperature magnetic properties by optimizing the annealing conditions. The powders were annealed in quartz tubes with ... -
Magnetic properties of the Co/Alq(3) interface
(2011)A method is described for measuring the magnetic integrity of ferromagnetic/organic interfaces that involves measuring the magnetic moment per unit area of bilayers with different ferromagnet thicknesses. The method is ... -
Magnetic study of Fe3O4 nanoparticles incorporated within mesoporous silicon
(Electrochemical Society, 2010)Porous silicon PS matrices with oriented, separated pores grown perpendicular to the surface are used as a template for the incorporation of magnetite nanoparticles. The Fe3O4 particles used for infiltration into the ... -
Magnetic, magnetotransport, and optical properties of Al-doped Zn0.95Co0.05O thin films
(American Institute of Physics, 2007)Thin films of 5% Co-doped ZnO with a range of Al codoping exhibit a band-edge shift, which varies with carrier concentration as n2/3. Carrier effective mass is 0.26me and mobility is ~ 10?cm2?V?1?s?1. The doped films, which ... -
Magnetism in dilute magnetic oxide thin films based on SnO2
(2006)Thin films of SnO2 prepared by pulsed-laser deposition on R-cut sapphire substrates exhibit ferromagnetic properties at room temperature when they are doped with Cr, Mn, Fe, Co, or Ni, but not with other 3d cations. ... -
Magnetism in hafnium dioxide
(2005)Thin films of HfO2 produced by pulsed-laser deposition on sapphire, yttria-stabilized zirconia, or silicon substrates show ferromagnetic magnetization curves with little hysteresis and extrapolated Curie temperatures far ... -
Magnetism in thin films of CaB6 and SrB6
(American Physical Society, 2004)Thin films of disordered hexaborides CaB6 and SrB6 deposited by pulsed-laser deposition on MgO (100) or Al2O3 (001) substrates are ferromagnetic. A typical room-temperature moment per unit area of substrate is 350 mB ... -
Magnetization Process in Dilute Magnetic Oxides
(2010)Thin films of dilute magnetic oxides often exhibit high-temperature ferromagnetism with magnetization curves of the form M approximate to M-s tanh(H/H-0); the curves are practically anhysteretic and temperature-independent ... -
Magnetoresistance of Co-doped ZnO thin films
(2006)Longitudinal, transverse, and perpendicular magnetoresistances were investigated at temperatures 1.2 T 300 K in fields of up to 20 T for four ZnO films: one undoped, two with 4% Co one paramagnetic, the other exhibiting ... -
Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent magnets
(2016)The structural and magnetic properties of ball-milled Fe-doped YCo 5 − x Fe x ( 0 ≤ x ≤ 0 . 5 ) were investigated. The magnetization increases with Fe-doping up to the solid solubility ... -
Origin of the Two-Dimensional Electron Gas at LaAlO3=SrTiO3 Interfaces: The Role of Oxygen Vacancies and Electronic Reconstruction
(2013)The relative importance of atomic defects and electron transfer in explaining conductivity at the crystalline LaAlO3=SrTiO3 interface has been a topic of debate. Metallic interfaces with similar electronic properties ... -
Site-specific order and magnetism in tetragonal Mn3Ga thin films
(2013)Mn 3 Ga bulk material and thin films deposited on several different substrates have been investigated using x-ray and neutron diffraction, x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and ... -
Site-specific order and magnetism in tetragonal Mn3Ga thin films
(2013)Mn 3 Ga bulk material and thin films deposited on several different substrates have been investigated using x-ray and neutron diffraction, x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and ... -
SnO2 doped with Mn, Fe or Co: Room temperature dilute magnetic semiconductors
(American Institute of Physics, 2004)Room temperature ferromagnetism is found in (Sn1?xMx)O2 (M=Mn, Fe, Co, x=0.05) ceramics where x-ray diffraction confirms the formation of a rutile-structure phase. Room temperature saturation magnetization of 0.2 and 1.8 ... -
Soft x-ray spectroscopic investigation of ferromagnetic Co-doped ZnO
(2006)The electronic properties of cobalt-doped ZnO were investigated through site-selective and element-sensitive x-ray-absorption spectroscopy in the vicinity of the Co L2,3 edge, the oxygen K edge, and at the Zn L3 edge. ... -
Superparamagnetism in MgO-based magnetic tunnel junctions with a thin pinned ferromagnetic electrode
(2010)MgO-based magnetic tunnel junctions have been fabricated with a thin Co40Fe40B20 (CoFeB) layer in the pinned synthetic antiferromagnetic CoFe/Ru/CoFeB stack. An inverted tunneling magnetoresistance is observed due to the ... -
Tunnel magnetoresistance of disordered low-moment Co2MnSi Heusler alloy films
(American Institute of Physics, 2005)Thin films of Co(1?x?y)MnxSiy (x = 0.18?0.26 and y = 0.23?0.29) were deposited from elemental targets onto thermal-oxidized Si substrates at room temperature using dc magnetron cosputtering. The as-deposited films appear ... -
Vortex states in soft magnets in two and three dimensions
(2010)The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the ... -
The zero-magnetization Heusler ferrimagnet
(2013)An unusual zero-moment half-metallic state has been predicted in stoichiometric Heusler compounds with 24 valence electrons, where, unlike an antiferromagnet, the two sublattices are chemically or crystallographically ...
