Role of cationic/oxygen vacancies in transport and magnetic properties of NiFe$_{2}$O$_{4}$ thinfilms prepared by pulsed laser deposition

POSTER

Abstract

Non-stoichometric NiFe$_{2}$O$_{4}$ thin films have been synthesized pulsed laser deposition. We have found monotonic increase in saturation magnetization and non-monotonic increase in conductivity as a function of oxygen pressure during growth of the samples. Substantial reduction in magnetization is found which varies from 0.4{\%} to 40{\%} of bulk value as a function of oxygen partial pressure during the growth of the samples. Three orders of magnitude increase in the conductivity of the sample prepared at an excessive oxygen deficient environment. These variations in saturation magnetization and conductivity as been discussed within the framework of cation/oxygen vacancies in inverse spinel NiFe$_{2}$O$_{4}$ structure. The changes in the electronic structures due to the presences of the vacancies have been investigated using X-ray Photoelectron spectroscopy.

Authors

  • Ghulam Jaffari

    Department of Physics and Astronomy, University of Delaware, Newark DE 19716, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA, Dept. of Physics and Astronomy, University of Delaware

  • Safia Anjum

    University of Engineering Technology, Lahore, Pakistan

  • Abdul K. Rumaiz

    National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973, USA.

  • Syed Shah

    Department of Material Science and Engineering; Department of Physics and Astronomy, Univeristy of Delaware, Newark, DE 19716, USA,, Dept of Materials Science and Egineering, University of Delaware, Materails Science and Engineering, University of Delaware