Title :
Fine metal particles having super high coercivity
Author :
Watanabe, Akio ; Uehori, Tatsuo ; Saitoh, Seitoku ; Imaoko, Yasuo
Author_Institution :
TDK Electronics Company Ltd., Nagano, Japan
fDate :
7/1/1981 12:00:00 AM
Abstract :
Fine iron-cobalt particles with coercivities as high as 2200 Oe have been obtained. The particles were precipitated from an aqueous solution using sodium borohydride. The coercivity was studied as a function of composition with the maximum coercivity found at 65:35 (Fe:Co ratio). The coercivity was found to arise from two effects. The first is shape anisotropy due to the chain of spheres structure of the particles. The second is a high magnetic surface anisotropy. No evidence of a contribution from magnetocrystalline anisotropy was found.
Keywords :
Coercive forces; Magnetic recording/recording materials; Powdered magnetic materials/devices; Anisotropic magnetoresistance; Boron; Cobalt; Coercive force; Magnetic anisotropy; Magnetic field measurement; Magnetic recording; Perpendicular magnetic anisotropy; Rough surfaces; Surface roughness;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1981.1061225
