Effect of interstitial oxygen on the crystal structure and magnetic properties of Ni nanoparticles

Abstract

Articles you may be interested in Tunability of optical memory in ferroelectric liquid crystal containing polyvinylpyrrolidone capped Ni nanoparticles for low power and faster device operation Effect of interstitial oxygen on the crystal structure and magnetic properties of Ni nanoparticles Abstract. In the present paper, we have studied the improvement in dielectric and optical properties of nematic liquid crystal (NLC) by doping of nickel oxide (NiO) nanoparticles. We have observed the dielectric and optical properties of pure and doped cells in order to understand the influence of NiO nanoparticles in the pure NLC. The experimental results have been analyzed through dielectric spectroscopic and optical texural methods.Detailed studies of dielectric parameters such as dielectric permittivity, dielectric loss and dielectric loss factor as a function of frequency with temperature were carried out. It has been observed that on doping the nanoparticles in NLC, the value of dielectric parameters (dielectric permittivity, dielectric loss and dielectric loss factor) decreases. The impedance and resistance of both pure and nanoparticles doped NLC cells were studied and found that for doped NLC, these parameter have low value. In addition to this, optical textures of the pure and doped samples have also been observed with a polarizing optical microscope at room temperature. All the results i.e. related to the investigation of dielectric and electro-optic properties have been explained by using existing theory of NLC.

Electrical and magnetic properties of nanocrystalline Fe100−xNix alloys

“…The peaks in the diffraction pattern from pure Ni could be indexed to the FCC phase. A tetragonal phase formation due to the presence of oxygen in Ni has been recently reported [21]. In the present work, however, no evidence for the presence of a tetragonal phase was observed.…”

Magnetic Properties of Ni/NiO Nanowires Deposited onto CNT/Pt Nanocomposites

“…This can be explained by taking into account an influence of the interface anisotropy that, through exchange coupling, can modify the magnetism of the Ni/NiO nanocrystals. Roy and co-workers [20] have anticipated that the NiO shell (in Ni/NiO core/shell nanoparticles) can act as a pinning layer, pinning the core spins near the interface of the Ni inner shell and the NiO outer shell via exchange interactions. This prevents the core spins from rotating freely and follows the applied field, thereby leading to the observed large coercivities.…”

“…[18,19] In nanometer-scale systems, the key factor in this magnetic interaction would be controlling the volume, shape, crystallinity, and structure of both the FM and AFM materials. [20][21][22][23][24][25][26][27] Ni/NiO nanowires therefore offer an attractive approach to control exchange coupling, anisotropic morphology, and spin-glasslike behaviour. Significant technological impacts based on this type of nanometer-sized assembly can thus be expected.…”

Structural, magnetic and electrical properties of Co–Ni–Mn ferrites synthesized by co-precipitation method

“…Nano-phase spinel ferrites have attracted much attention due to their technological importance in varieties of fields, such as microwave devices, high speed digital tape and disk recording, ferro-fluids, catalysis, and magnetic refrigeration systems [1]. In recent years, magnetic properties of nano-particles are of great interest because of the development of high-density magnetic storage media with nano-sized constituent particles or crystallites [2,3]. Also, trivalent ion substituted spinel ferrites have shown to be promising candidates for applications in high-density magnetic recording and enhanced memory storage, magnetic fluids and catalysts [4].…”