Magnetocrystalline Anisotropy Constant of 3.1% Si–Fe at Room Temperature and Below

The first crystal anisotropy constant of a 3.1% Si–Fe alloy has been determined from torque measurements on a {100} single-crystal disk, in fields up to 20 000 oersteds and at temperatures of 77, 195, and 300°K. The values of K1 at these three temperatures are 425±10×103, 405±10×103, and 365±10×103 ergs/cm3.