Cobalt ferrite (CoFe2 O4 ) nanoparticles have attracted significantly attentions for spintronics, recording media and bioapplications due to their unique magnetic and chemical properties. In this work, single phase CoFe2 O4 nanoparticles were synthesized at various coprecipitation temperatures (60, 80 and 90 °C) without post calcination. The effects of oleic acid as surfactant on the microstruc...

A model for estimating the total eddy current losses in ring ferrite cores is proposed, which based on a microstructure of electrical parameters material (conductivity and permittivity) solution wave equations core. The presented model, combined with state-of-the-art estimation hysteresis losses, gives good agreement core loss measurements, over wide range frequencies (10–700 kHz).

The brushless doubly-fed machine (BDFM) has two stator windings with different pole numbers, supplied frequencies. Therefore, the distribution of magnetic fields in and rotor iron is complex. In addition, flux density non-sinusoidal a DC offset at natural speed. This makes use conventional hysteresis models utilised for sinusoidal impractical BDFM. this paper new model proposed BDFM based on sc...

This article reviews the ferromagnetic hysteresis, magnetomechanical, and Barkhausen properties of magnetic materials presents an integrated model to describe these effects underlying mechanisms that cause effects. Hysteretic ferromagnets, such as permeability, coercivity, remanence, hysteresis loss are known be sensitive external factors including applied stress, temperature, heat treatment, i...

We report on the impact of realistic gain and loss models on the bistable operation of nonlinear parity-time (PT) Bragg gratings. In our model we include both dispersive and saturable gain and show that levels of gain/loss saturation can have a significant impact on the bistable operation of a nonlinear PT Bragg grating based on GaAs material. The hysteresis of the nonlinear PT Bragg grating is...

Targeted hyperthermia treatment using magnetic nanoparticles is a promising cancer therapy. However, the mechanisms of heat dissipation in the large alternating magnetic field used during such treatment have not been clarified. In this study, we numerically compared the magnetic loss in rotatable nanoparticles in aqueous media with that of non-rotatable nanoparticles anchored to localised struc...