The Switching Characteristics of 4-79 Permalloy Cores with Different Anneals

The magnetic properties of 4-79 Permalloy cores, which have been annealed at different temperatures, are discussed. Cores annealed at relatively low temperatures are characterized by high coercivity, slower switching, insensitivity to strain, magnetization difficult to rotate, and insensitivity to an applied transverse field. Some cores exhibit a preference to one remanent state over the opposite state.