Technology Development for Transition Metal-Rare Earth High-Performance Magnetic Materials
Semiannual interim technical rept. no. 4, 1 Jan-30 Jun 1972
GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY NY
Pagination or Media Count:
A session that has been organized for the 1972 Magnetism Conference will review work done under this contract and elsewhere on the problem of the origin of the coercive force in high-anisotropy materials. Polarized light metallography has been used to study magnetic domain configurations in Co5Sm, Co5Y, Co5Ce, and Co5Pr as a function of crystal thickness. Magnetic domain structures in several Co17R2, Co,Fe17R2, and Co7R2 phases have been examined using polarized light. The magnetic moment and hysteresis properties of a high- density, nearly completely oriented Co5Sm magnet alloy have been measured from 300K to 4.2K and in applied fields up to 140 kOe. The demagnetization properties of a series of sintered Co-Sm magnets have been measured over the range 0 to 750K. Saturation magnetization, intrinsic coercive force, anisotropy field, and anisotropy constants were determined for a sample of sintered Co5Sm at 4.2, 77, 300, and 500K. The relationship between the temperature dependence of the coercivity and the anisotropy parameters is discussed.
- Electrical and Electronic Equipment
- Metallurgy and Metallography
- Electricity and Magnetism