Low temperature magnetic hysteresis of fine particle aggregates occuring in some natural samples

Chemical synthesis, structural and magnetic properties of nano-structured Co–Zn–Fe–Cr ferrite

“…The microstructure and morphology of the ferrite powder were characterized by scanning electron microscopy (SEM) (Model JEOL-JSM 840). The magnetic data for these samples were obtained with the help of high field hysteresis loop technique [26]. The low field AC susceptibility measurements on powder samples were carried out in the temperature range 300-800 K using double coil setup [27] operating at a frequency of 263 Hz.…”

Structural and magnetic properties of zinc- and aluminum-substituted cobalt ferrite prepared by co-precipitation method

“…The wet samples of Co-Zn-Fe-Al system were annealed at 800 • C for 12 h. The X-ray powder diffraction patterns were recorded using Cu-K α radiation on Philips X-ray diffractometer (PW 3710). The saturation magnetization of each sample was measured using a high field hysteresis loop technique [12]. The low field AC susceptibility measurements on powder samples were carried out in the temperature range 300-800 K using double coil set-up [13] operating at a frequency of 263 Hz in the rms field of 39.8 A·m −1 .…”

Thermal hysteresis and domain states in Ni–Zn ferrites synthesized by oxalate precursor method

“…From the knowledge of actual density and X-ray density, the percentage of porosity was calculated. The magnetization measurement was made with the help of high field hysteresis loop tracer (Magneta, Mumbai, India) [21]. The variation of H c with the composition and temperature was estimated on toroidal cores using the relation given by Sankpal et al [22].…”