Conductive single-phase SrMoO epitaxial films synthesized in pure Ar ambience via plasma-assisted radio frequency sputtering.

The cubic perovskite SrMoO with a paramagnetic ground state and remarkably low room-temperature resistivity has been considered as a suitable candidate for the new-era oxide-based technology. However, the difficulty of preparing single-phase SrMoO thin films by hydrogen-free sputtering has hindered their practical use, especially due to the formation of thermodynamically favorable SrMoO impurity. In this work, we developed a radio frequency sputtering technology enabling the reduction reaction and achieved conductive epitaxial SrMoO films with pure phase from a SrMoO target in a hydrogen-free, pure argon environment.

Slow spin dynamics of cluster spin-glass spinel Zn(Fe1-xRu)O: role of Jahn-Teller active spin-1/2 Cuions at B-sites.

We report the slow spin dynamics of cluster spin-glass (SG) spinel Zn(Fe1-xRu)Oby means of detaileddc-magnetization andac-susceptibility studies combined with the heat capacity analysis. Two specific compositions ( = 0.5, 0.

Antiferromagnetic short-range order and cluster spin-glass state in diluted spinel ZnTiCoO.

The nature of magnetism in the doubly-diluted spinel ZnTiCoO= (Zn)[TiCo]Ois reported here employing the temperature and magnetic field () dependence of dc susceptibility (), ac susceptibilities (' and″), and heat capacity () measurements. Whereas antiferromagnetic (AFM) Néel temperature= 13.9 K is determined from the peak in the ∂()/∂vsplot, the fit of the relaxation time(determined from the peak in the″ vsdata at different frequencies) to the Power law:=[(-)/]yields the spin glass freezing temperature= 12.

Magnetic field-temperature phase diagram, exchange constants and specific heat exponents of the antiferromagnet MnNbO.

This work presents the magnetic field-temperature (-) phase diagram, exchange constants, specific heat () exponents and magnetic ground state of the antiferromagnetic MnNbOpolycrystals. Temperature dependence of the magnetic susceptibility(=/) yields the Néel temperature= 4.33 K determined from the peak in the computed ∂()/∂vsplot in agreement with the transition in thevsdata at= 4.

Tailoring the electronic structure and magnetic properties of pyrochlore CoTiGeO: a GGA +study.

We report the electronic structure and magnetic properties of CoTiGeO(0 ⩽⩽ 1) spinel by means of the first-principle methods of density functional theory involving generalized gradient approximation along with the on-site Coulomb interaction () in the exchange-correlation energy functional. Special emphasis has been given to explore the site occupancy of Ge atoms in the spinel lattice by introducing the cationic disorder parameter () which is done in such a way that one can tailor the pyrochlore geometry and determine the electronic/magnetic structure quantitatively. For all the compositions (), the system exhibits weak tetragonal distortion (/≠ 1) due to the non-degeneratedz2anddx2-y2states (orbitals) of the B-site Co.

Antiferromagnetism, spin-glass state, H-T phase diagram, and inverse magnetocaloric effect in CoRuO.

Static and dynamic magnetic properties of normal spinel CoRuO= (Co)A[Co3+Ru3+]BO4are reported based on our investigations of the temperature (), magnetic field () and frequency () dependence of the ac-magnetic susceptibilities and dc-magnetization () covering the temperature range= 2 K-400 K and H up to 90 kOe. These investigations show that CoRuOexhibits an antiferromagnetic (AFM) transition at∼ 15.2 K, along with a spin-glass state at slightly lower temperature () near 14.

Effects of Cu doping on the electronic structure and magnetic properties of MnCoO nanostructures.

Reported here are the results and their analysis from our detailed investigations of the effects of Cu doping ([Formula: see text]) on the electronic structure and magnetic properties of the spinel [Formula: see text]O. A detailed comparison is given for the [Formula: see text] and [Formula: see text] cases for both the bulk-like samples and nanoparticles. The electronic structure determined from x-ray photoelectron spectroscopy and Rietveld analysis of x-ray diffraction patterns shows the structure to be: ([Formula: see text]) [Formula: see text] [Formula: see text] [Formula: see text]] [Formula: see text] i.

Modulation of Peptide Based Nano-Assemblies with Electric and Magnetic Fields.

Peptide based nano-assemblies with their self-organizing ability has shown lot of promise due to their high degree of thermal and chemical stability, for biomaterial fabrication. Developing an effective way to control the organization of these structures is important for fabricating application-oriented materials at the molecular level. The present study reports the impact of electric and magnetic field-mediated perturbation of the self-assembly phenomenon, upon the chemical and structural properties of diphenylalanine assembly.

Preparation, microstructure and optical absorption behaviour of NiO thin films.

Nickel oxide thin films have been prepared by spin coating on glass, silicon(1ll) and quartz substrate using a solution of nickel acetate tetrahydrate in 2-methoxyethanol and mono-ethanolamine and subsequent annealing at 300-600 degrees C for 2 h in air. These films have been characterized with regard to phase, microstructure and optical absorption using X-ray diffraction, atomic force microscopy and UV-visible spectrophotometry, respectively. It is shown that NiO thin films have polycrystalline nature and possess an f.

Sol-gel synthesis and behaviour of nickel containing ZnO nanoparticles.

An attempt has been made to synthesize nickel (up to 5 at%) containing ZnO diluted magnetic semiconductors by sol-gel process using zinc acetate dihydrate, nickel acetate tetrahydrate and oxalic acid as precursors and ethanol as solvent. The process comprises of gel formation, digestion at 80 degrees C for 24 h to obtain oxalate and calcination at 400 degrees C or above for 2 h for decomposition to oxide. The resulting powders correspond to wurtzite hexagonal structure similar to that of pure ZnO and contain nanoparticles of average diameter decreasing with (i) decrease of calcination temperature and (ii) rise in nickel content (range being 13-29 nm).