Showing papers by "Santiranjan Shannigrahi published in 2011"
TL;DR: In this article, the electrocaloric properties of PbZr0.52Ti0.48O3 epitaxial films and 0.7PMN-0.3PT single crystals are measured and demonstrated enhanced low temperature refrigeration at morphotropic phase boundary compositions.
Abstract: The electrocaloric properties of PbZr0.52Ti0.48O3 (PZT) epitaxial films and 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (0.7PMN-0.3PT) single crystals are measured and demonstrated enhanced low temperature refrigeration at morphotropic phase boundary compositions. The results reveal large adiabatic cooling figures in ∼260 nm PZT films (11 K in 15 V) and 200 μm thick 0.7PMN-0.3PT single crystals (2.7 K in 240 V) at Curie transition temperatures and secondary cooling peaks at lower temperatures, near critical points. This is a very useful aspect of ferroelectric cooling elements to attain effective cooling over wide range of working temperatures in solid-state devices.
97 citations
TL;DR: In this paper, a mutual ferromagnetic and ferroelectric coupling in Cu-doped ZnO was demonstrated via deterministic control of Cu doping and defect engineering, and the coexistence of multivalence Cu ions and oxygen vacancies is important to multiferroic behaviors.
Abstract: A mutual ferromagnetic and ferroelectric coupling (multiferroic behavior) in Cu‐doped ZnO is demonstrated via deterministic control of Cu doping and defect engineering. The coexistence of multivalence Cu ions and oxygen vacancies is important to multiferroic behaviors in ZnO:Cu. The samples show clear ferroelectric and ferromagnetic domain patterns. These domain structures may be written reversibly via electric and magnetic bias.
95 citations
TL;DR: In this paper, Mn and Zn simultaneously substituted CoFe2O4, Co0.6Zn0.4Fe1.7Mn 0.3O4 has been proposed as magnetostrictive component having the maximum in plane piezomagnetic coupling coefficient (q11+q12∼0.070
Abstract: In this letter, Mn and Zn simultaneously substituted CoFe2O4, Co0.6Zn0.4Fe1.7Mn0.3O4 has been proposed as magnetostrictive component having the maximum in plane piezomagnetic coupling coefficient (q11+q12∼0.070 ppm/Oe) at a field of H∼300 Oe with appreciable saturation values of longitudinal and transverse magnetostriction coefficients (λ11∼−20 ppm and λ12∼10 ppm). On incorporating this in composite (i.e., (x) PbZr0.52Ti0.48O3−(1−x) Co0.6Zn0.4Fe1.7Mn0.3O4) preparation, maximum magnetoelectric voltage coefficients (αE∼122 mV/cm Oe) was obtained in sample x=0.90 at ac magnetic field of amplitude ∼1 Oe and frequency ∼1 kHz.
60 citations
TL;DR: The Pb(Zr0.95Ti0.05)O3 (PZT) film was highly textured with (1−0−0) orientation and gave good ferroelectric properties with saturated polarization of 15μC/cm2 as discussed by the authors.
44 citations
TL;DR: In this article, the effect of RuO 2 electrodes and La 2 O 3 resistive layer were analyzed on the electrical and ferroelectric properties of BiFeO 3 (BFO) films deposited on Pt/Ti/SiO 2 /Si substrates using a chemical solution method.
40 citations
TL;DR: In this article, composite magnetoelectric films using ferroelectric lead zirconate titanate (PZT) and ferromagnetic nickel zinc ferrite (NZF) were prepared using the combination of sol-gel and hydrothermal process on Pt/Ti/SiO 2 /Si substrates.
6 citations
TL;DR: In this paper, the effects of processing parameters on the structure, microstructure, magnetic, and magnetotransport properties of lanthanum manganite (LMO) ceramics are presented.
4 citations