NDLI: Studies on multifunctional behaviour of Cr doped SrWO$

Content Provider	Springer Nature Link
Author	Muralidharan, M. Anbarasu, V. Elaya Perumal, A. Sivakumar, K.
Copyright Year	2015
Abstract	Transition metal doped divalent tungstate compounds endowed with coalescence of optical and magnetic property forms a class of multifunctional materials and found importance in the field of magneto-optical and spintronics device applications. In the present work, pure and Cr doped SrWO$_{4}$ compounds were synthesized by chemical precipitation method. Powder X-ray diffraction analysis reveals scheelite type tetragonal structure of all the compounds. The effect of doping on crystal symmetry and local structure of the compounds was investigated by Laser Raman spectroscopy studies. The micro sphere and poly-dispersed surface morphology of all the compounds were examined by scanning electron microscopy and transmission electron microscopy analysis. Further, the evidences for oxygen vacancy and oxidation states of elements present in the compounds were analyzed by X-ray photoelectron spectroscopy. The optical absorption spectra explicitly describe the distinctive shift in absorption edge and linear decrease in band gap values while increasing Cr concentrations in SrWO$_{4}$ system. The presence of defective states and oxygen vacancy in Cr doped SrWO$_{4}$ compounds were confirmed with multicolor PL emission spectra. Electron paramagnetic resonance spectra authenticates the inducement of paramagnetic center (Cr$^{3+}$) on increasing the dopant concentration. The magnetization analysis demonstrates enhanced ferromagnetic behaviour of all the Cr doped compounds, whereas the pure SrWO$_{4}$ compound exhibits frustrated ferromagnetic behaviour. The augmented ferromagnetic ordering in Cr doped compounds has been explained in terms of carrier-induced Ruderman–Kittel–Kasuya–Yosida interaction theory. The possible inducement of carrier mediated room temperature ferromagnetism in Cr doped SrWO$_{4}$ explicit demonstrates a hopeful candidature for magneto- optical and spintronic device applications.
Starting Page	6926
Ending Page	6938
Page Count	13
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	26
Issue Number	9
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2015-06-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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