A. M. Awasthi

Multiferroic properties of polycrystalline Bi1−xCaxFeO3

It is shown that Ca2+ doping at Bi-site results in the release of weak ferromagnetism in BiFeO3. Structural transformation from rhombohedral to triclinic is observed with 10% Ca doping. Raman measurements show the presence of oxygen vacancies with Ca doping and no evidence of either intermediate valence or the tetravalence of iron is observed from Mossbauer measurements. No significant change in Neel temperature is observed with Ca doping. The observed weak ferromagnetism and ferroelectric nature at room temperature indicates the multiferroic nature of Bi1−xCaxFeO3 (x=5% and 10%) samples.

Study of the effect of Mn doping on the BiFeO3 system

In this work a Mn doped magnetoelectric BiFeO3 system is studied. X-ray diffraction (XRD), scanning electron microscopy, energy dispersive x-ray analysis (EDX), Mossbauer spectroscopy at room and high temperatures, differential scanning calorimetry (DSC), high temperature magnetization, dielectric constant measurements and x-ray photoelectron spectroscopy (XPS) are used to characterize the samples. The XRD result shows BiFeO3 as a major phase along with about 1–2% impurity phase. EDX shows the equi-atomic ratio of Bi and Fe site cations. Using DSC it is observed that the Neel temperature decreases with Mn doping. Using Mossbauer and XPS it is observed that Fe exists in the +3 oxidation state. The samples have an antiferromagnetic nature with Mn doping.

Theoretical prediction and experimental study of a ferromagnetic shape memory alloy: Ga2MnNi

We predict the existence of a ferromagnetic shape memory alloy

Variation of magnetoresistance in Ni2+xMn1−xGa with composition

{\text{Ga}}_{2}\text{MnNi}

Magnetic and 57Fe Mössbauer study of magneto-electric GaFeO3 prepared by the sol-gel route.

using density-functional theory. The martensitic start temperature

Investigation of charge states and multiferroicity in Fe-doped h-YMnO3

({T}_{M})

Millimeter-wave surface impedance measurements of YBa2Cu3O7−δ ceramic superconductors

is found to be approximately proportional to the stabilization energy of the martensitic phase

Modulated structure in the martensite phase of Ni1.8Pt0.2MnGa: A neutron diffraction study

(\ensuremath{\delta}{E}_{\text{tot}})

Discovery of strange kinetics in bulk material: Correlated dipoles in CaCu3Ti4O12

for different shape memory alloys. Experimental studies performed to verify the theoretical results show that

Temperature dependent electrical transport characteristics of BaTiO3 modified lithium borate glasses

{\text{Ga}}_{2}\text{MnNi}