Magnetic Switching in Materials

Magnetic materials is an old subject poorly understood · by the majority of engineers. Recent research, particularly in magnetic films, has provided insights to understand and explain the behavior of the materials reacting to applied magnetic fields. Elementary domain theory is central to any significant comprehension. Dynamic behavior of nonlinear magnetic material cannot be analyzed entirely from the familiar B-H or hysteresis loop. However, the loop shape can be used to confirm behavior anticipated on the basis of domain theory and observation. Dynamic processes in magnetic material involve a change in the state, which is termed switching. A review of the fundamental principles pertinent to switching behavior and experimental data from a typical magnetic core are used to bring together theory and practical observation. Many recent applications of magnetic material require a more sophisticated understanding built upon such a knowledge of material behavior.