Magnetic properties of cobalt-rare earth magnets for microwave applications

A family of sintered Co-rare earth alloys utilizing Sm, Pr, La, or Ce mischmetal has been developed. Each alloy is designed to optimize one of the following characteristics: 1) Magnets which exhibit magnetic energy products in excess of 20 MG . Oe; 2) Magnets which exhibit reversible demagnetization behavior in adverse fields up to 14 000 Oe; 3) Magnets using inexpensive rare earth metals to maximize the magnetic energy per unit cost. These alloys should extend the range of use of Co-rare earth magnets for microwave devices.