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  • Conducting channel at the LaAlO3/SrTiO3 interface 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (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 MICHAEL DAVID; 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 ...
  • 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 ...
  • Exchange-biased magnetic tunnel junctions with antiferromagnetic epsilon-Mn3Ga 

    COEY, JOHN MICHAEL DAVID; VENKATESAN, MUNUSWAMY; STAMENOV, PLAMEN (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 ...
  • Ferromagnetism in defect-ridden oxides and related materials 

    COEY, JOHN MICHAEL DAVID; 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 ...
  • Influence of an Au capping layer on the magnetic properties of CoPt nanowires 

    COEY, JOHN MICHAEL DAVID; MONZON, LORENA; VENKATESAN, MUNUSWAMY; STAMENOV, PLAMEN (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 ...
  • M?_ssbauer spectrometry of A2FeMoO6 (A =Ca, Sr, Ba): Search for antiphase domains 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Physical Society, 2001)
    M?_ssbauer spectrometry was carried out in the range of temperature from 4 K to well above the Curie temperature on polycrystalline ceramics of A2FeMoO6 (A=Ca,Sr,Ba). A secondary component in all the paramagnetic or ...
  • Magnetic and electronic properties of D022-Mn3Ge (001) films 

    STAMENOV, PLAMEN; COEY, JOHN MICHAEL DAVID; SANVITO, STEFANO; VENKATESAN, MUNUSWAMY (2012)
    Oriented thin films of Mn3Ge with the tetragonal D022structure,grown on strontium titanate substrates, exhibit a low magnetization M s?=?73?kA m?1 combined with high uniaxial anisotropyK u?=?0.91?MJ m?3 at 300?K, making ...
  • Magnetic properties of mechanically-alloyed Sm-Co nanophase hard magnets 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (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 

    COEY, JOHN MICHAEL DAVID; VENKATESAN, MUNUSWAMY (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 

    VENKATESAN, MUNUSWAMY (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 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (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 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Physical Society, 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 

    COEY, JOHN MICHAEL DAVID; VENKATESAN, MUNUSWAMY (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 

    LUNNEY, JAMES GERARD; COEY, JOHN MICHAEL DAVID; LUNNEY, JAMES GERARD; VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (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 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID; STAMENOV, PLAMEN (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 

    VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID (American Institute of Physics, 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 ...
  • New two in one magnetic fluorescent nanocomposites 

    VENKATESAN, MUNUSWAMY; GOUNKO, IOURI (SPIE, 2005)
    Magnetite nanoparticles have been coated by a porphyrin derivative to produce new magnetic materials with fluorescent properties. The magnetic nanoparticles were prepared using two different methods, one based on sol-gel ...