Borkar, Hitesh and Choudhary, R. J. and Singh, V. N. and Tomar, M. and Gupta, Vinay and Kumar, Ashok (2015) Competing magnetic interactions and low temperature magnetic phase transitions in composite multiferroics. Materials Research Express, 2 (8). ISSN 2053-1591

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Novel magnetic properties and magnetic interactions in composite multiferroic oxides Pb [(Zr0.52Ti0.48)(0.60)(Fe0.67W0.33)(.40)]O-3](0.80)-[CoFe2O4](0.20) (PZTFW-CFO) have been studied from 50 to 1000 Oe field cooled (FC) and zero field cooled (ZFC) probing conditions, and over a wide range of temperatures (4-350 K). Crystal structure analysis, surface morphology, and high resolution transmission electron microscopy images revealed the presence of two distinct phases, where microand nano-size spinelCFO were embedded in tetragonal PZTFW matrix and applied a significant built-in compressive strain (similar to 0.4-0.8%). Three distinct magnetic phase transitions were observed with the subtle effect of CFO magnetic phase onPZTFW magnetic phase transitions below the blocking temperature (T-B). Temperature dependence magnetic propertym(T) shows a clear evidence of spin freezing in magnetic order with lowering in thermal vibration. Chemical inhomogeneity and confinement of nanoscale ferrimagnetic phase in paramagnetic/antiferromagnetic matrix restrict the long range interaction of spin which in turn develop a giant spin frustration. A large divergence in the FC and ZFC data and broad hump in ZFC data near 200 (+/- 10) Kwere observed which suggests that large magnetic anisotropy and short range order magnetic dipoles lead to the development of superparamagnetic states in composite.

Item Type: Article
Subjects: Materials Science
Depositing User: Dr. Rajpal Walke
Date Deposited: 20 Sep 2016 07:05
Last Modified: 20 Sep 2016 07:05

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