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R. C. Kambale,Y. A. Park,허남정,K. Y. Rajpure,S. S. Suryavanshi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.6
Magnetostrictive-piezoelectric heterostructures show the strong magnetoelectric (ME) interactions that are mediated by mechanical forces. Magnetoelectric particulate composite structures of (0.1, 0.2, 0.3) mol% CoMn<SUB>0.2</SUB>Fe_(1.8)O_4– (0.9, 0.8, 0.7) mol% BaZr_(0.08)Ti_(0.92)O_3 has been prepared by a solid-state reaction. X-ray diffractometry patterns show variation in the amount of intensity of the spinel phase with ferrite content. The effect of constituent phase variation on the B–H hysteresis behavior and the dielectric properties was examined. The dielectric constant shows the usual dielectric dispersion behavior with increasing frequency which is due to the Maxwell–Wagner type surface interfacial polarization. The dynamic transverse ME coefficient α_(ME) of the composites has been measured at 850 Hz. The strong dependence of ME response on the content of ferrite phase was observed. The paper presents the investigations on ME composites for their dielectric, magnetic and ME properties. The results are discussed with proper scientific reasons along with the applicability of the materials in ME sensing devices.
Magnetocaloric Effect in Ni-Zn Ferrite Nanoparticles Prepared by Using Solution Combustion
K. D. Lee,R. C. Kambale,허남정 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
NixZn1−xFe2O4 (x = 0.2 and 0.3) ferrite nanoparticles with sizes ranging from 65 to 70 nm weresynthesized employing the solution combustion route. The magnetocaloric behavior was investigatedwithin the 50 K T 400 K range of temperatures (T). The entropy change (S) and theadiabatic temperature change (T) were derived from magnetization (M) and specific heat (CP )measurements. Both compositions exhibited broad peaks for the isothermal entropy change. Themagnetic field (H)-dependent T was analyzed within the mean-field approximation scheme, andthe observed magnetocaloric properties of the nanoparticle samples were compared with those ofa bulk sample. Our study suggests that the magnetocaloric properties of magnetic oxides stronglydepend on the particle size; thus, particle size should be considered as a key tuning parameter inthe optimization of magnetic refrigeration.