R. Ranganathan

Magnetism of crystalline and amorphous La0.67Ca0.33MnO3 nanoparticles

We report the ferromagnetism of La0.67Ca0.33MnO3 in bulk polycrystalline, nanocrystalline, and amorphous phases. The structural change from crystalline phase to amorphous phase exhibited a systematic decrease in TC (paramagnetic to ferromagnetic transition temperature) and spontaneous magnetization (MS). The experimental results suggested few more interesting features, e.g., appearance of large magnetic irreversibility in the temperature dependence of magnetization, lack of magnetic saturation at high magnetic field, blocking of magnetization below TB, and enhancement of coercivity. In addition, the magnetic phase transition near to TC changes from first order character in bulk sample to second order character in nanocrystalline and amorphous samples. We understand the observed magnetic features as the effects of decreasing particle size and increasing magnetic (spin-lattice) disorder. The magnetic dynamics of amorphous samples is distinctly different from the nanocrystalline samples and also found to be ...

Lattice expansion and noncollinear to collinear ferrimagnetic order in a Mn Cr 2 O 4 nanoparticle

We report the magnetic behavior of spinel chromite

Size dependent magnetic phase of nanocrystalline Co0.2Zn0.8Fe2O4

\mathrm{Mn}{\mathrm{Cr}}_{2}{\mathrm{O}}_{4}

Cluster glass behaviour in Co0.2Zn0.8Fe2−xRhxO4(x=0–1.0)

. Bulk

Linear and non-linear ac susceptibility of reentrant spin glass system

\mathrm{Mn}{\mathrm{Cr}}_{2}{\mathrm{O}}_{4}

An automated ac-magnetic susceptibility apparatus

shows a sequence of magnetic states, i.e., paramagnetic (PM) to collinear ferrimagnetic (FM) state below

Magnetic ordering in Fe2-xZnxMoO4(X = 0.1-1) spinel

{T}_{C}\ensuremath{\sim}45\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Conductivity and viscosity studies of dimethyl sulfoxide (DMSO)-based electrolyte solutions at 25 °C

and collinear FM state to noncollinear FM state below

Transverse vibrations driven negative thermal expansion in a metallic compound GdPd3B0.25C0.75

{T}_{S}\ensuremath{\sim}18\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Magnetic properties of Fe2Mo1−xTixO4

. Decrease of particle size reduces the noncollinear spin structure and consequently, magnetic transition at