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Web End = J Mater Sci: Mater Electron (2016) 27:25452556 DOI 10.1007/s10854-015-4057-1
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Web End = Enhanced ferromagnetism in Cr doped SrMoO4 scheelite structured compounds
M. Muralidharan1 V. Anbarasu2 A. Elaya Perumal3 K. Sivakumar1
Received: 17 August 2015 / Accepted: 8 November 2015 / Published online: 14 November 2015 Springer Science+Business Media New York 2015
Abstract Wide band gap semiconductors of pure and Cr (5, 10, 15 and 20 %) doped SrMoO4 compounds were synthesized by chemical precipitation method. Powder
X-ray diffraction analysis conrms scheelite type tetragonal crystal structure of the compounds. Metal oxide vibrations of the prepared compounds were identied by Fourier transform infra red spectroscopy. Laser Raman spectral studies elucidated the presence of local order-disorder parameters in Cr doped SrMoO4 compounds.
Oxidation state of elements present in a compound, chemical composition and the presence of oxygen vacancy were analyzed by X-ray photoelectron spectroscopy. Electron microscopy studies reveal the high degree of agglomeration and change in shape of particles while increasing dopant concentration in SrMoO4 system. Optical absorption spectra evidence the distinctive shift in absorption peak and exhibit red shift. The presence of paramagnetic Cr3? ion in the host lattice was identied with electron paramagnetic resonance analysis. The magnetization studies reveal the effect of carrier doping on SrMoO4 compounds by exhibiting paramagnetic to saturated ferromagnetic phase transition. The presence of excess carriers by doping leads to CrCr interactions and results in antiferromagnetic ordering in highly doped compounds and the enhancement of magnetic moment
have been explained in terms of RKKY interaction theory. The inducement of ferromagnetic behavior by doping Cr in SrMoO4 compounds reveal the possibility of multifunctional behaviour and showing their prompt candidature for the fabrication of optoelectronic and spintronics devices.
1 Introduction
Wide band gap semiconducting materials with multifunctional behaviour have received much attention in recent years due to their potential applications in the eld of opto-electronics and memory devices [1]. The quest for ferro-magnetic semiconductors with a Curie temperature above room temperature found useful for the fabrication of spin based electronic devices [2] due to the inducement of...