AVS 50th International Symposium
    Magnetic Interfaces and Nanostructures Thursday Sessions
       Session MI+SC-ThM

Paper MI+SC-ThM11
Ferromagnetism in Cobalt Doped La@sub 0.5@Sr@sub 0.5@TiO@sub 3-d@ Films

Thursday, November 6, 2003, 11:40 am, Room 316

Session: New Spintronic Materials
Presenter: S.R. Shinde, University of Maryland
Authors: S.R. Shinde, University of Maryland
S.B. Ogale, University of Maryland
Y.G. Zhao, University of Maryland
J. Higgins, University of Maryland
R.J. Choudhary, University of Maryland
S.E. Lofland, Rowan University
C. Lanci, Rowan University
J.P. Buban, University of Illinois at Chicago
N.D. Browning, University of Illinois at Chicago
S. Das Sarma, University of Maryland
A.J. Millis, Columbia University
V.N. Kulkarni, University of Maryland
R.L. Greene, University of Maryland
T. Venkatesan, University of Maryland
Correspondent: Click to Email
Epitaxial films of lightly cobalt doped La@sub 0.5@Sr@sub 0.5@TiO@sub 3-d@ are shown to exhibit ferromagnetism at room temperature. A clear hysteresis loop with coercevity ~150 Oe and the Curie temperature around 450 K are observed for these (001) oriented films grown by pulsed laser deposition at oxygen pressure of 10@super -4@ Torr on LaAlO@sub 3@ substrates. For cobalt doping up to ~2%, no inhomogeneity is observed by scanning transmission electron microscopy (S-TEM). The magnetization is found to change non-monotonically (in the range 1-3 µ@sub B@/Co) as a function of conductivity in films deposited at different partial pressures. The films range from being opaque metallic to transparent semiconducting depending on the oxygen pressure during growth and are yet ferromagnetic at and above room temperature.