Nanocomposite of CeO2 and High-Coercivity Magnetic Carrier with Large Specific Surface Area

Magnetic properties of hematite with large coercivity

The magnetic properties of hematite powders produced by a solid state nucleation-and-growth process are studied as a function of temperature T and applied field H. Independently of the temperature, there exists a soft magnetic contribution that is assigned to the canting of spins at the superficial shell of each particle and is not affected by the Morin transition. At 220 < T < TM a magnetic co...

Preparation and Characterization of High Specific Surface Area γ-Alumina Nanoparticles Via Sol-Gel Method

In the present investigation, γ-alumina nanoparticles with particle sizes less than 10 nm, high specific surface area (351 m2/g), high pore volumes and relatively narrow pore sizes distribution was prepared via sol-gel method in presence of aluminum isopropoxide as an aluminum precursor, distilled water, acetic acid as hydrolysis rate controller and tert-butanol as solvent. They had meso ...

Preparation of High Surface Area ZrO2 Nanoparticles

In comparison to the previous researches, ZrO2 nanoparticles with higher surface area (85 m2/g) have been synthesized in this research. The as-prepared ZrO2 nanoparticles by co-precipitation method were characterized with X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The surface area of the s...

Growth, structural, and magnetic properties of high coercivity CoÕPt multilayers

Electron beam evaporated Co/Pt multilayers $@Co(tCo nm!/Pt~1 nm!#10, 0.2,tCo,2 nm% with perpendicular magnetic anisotropy and room temperature coercivities Hc52– 15 kOe are studied as a function of growth temperature TG. Hysteresis loops and magnetic force microscopy ~MFM! indicate changes in the magnetization reversal mechanism along with a sharp increase in coercivity for TG*230– 250 °C. Film...

CoFe2O4 nanostructures with high coercivity