Magnetic properties of FeCo nanoparticles for information storage

Abstract

Submicron FeCo magnetic grains with different percents of cobalt were grown in the presence of magnetic field. After omitting the excess ions and oxygen, heat treatment was performed and some samples were oriented in a polymer background in the presence of a magnetic field. The results of SEM, XRD, and magnetic measurements confirm the existence of induced magnetic anisotropy. As the strength of the magnetic field during the growth of Fe0.7Co0.3 grains increases, the coercively increases from 820 to 1600 Oe. Measurements of magnetization time variation of the samples show a linear correspondence between magnetic stability factor and coercivity. The magnetization of the oriented samples increases by 25%. Raising the coercivity of the medium is the main factor for increasing the capacity of magnetic information storage.

Keywords

• coercivity
• remanent magnetization
• magetic anisotropy
• single-domain grains
• magnetic recording