NONSTATIONARY MAGNETORESONANCE EFFECTS UNDER MICROWAVE FIELD OF HIGH-INTENSITY

The statistical model of the formation of an Electron Spin Resonance ( ESR) line for arbitrary values of a variable field based on the micros copic description of the media as systems of the magnetic moments inte racting with phonons of a crystal lattice is offered. It is establishe d that at high intensity of a variable field the magnetic resonance li ne demonstrates splitting in two components that is caused by the nonl inear character of magnetic interaction. It is shown that the reason o f this phenomenon is caused by the formation of two subsystems of the magnetic moments with the opposite orientation of their projections to a plane of a microwave field polarization. The comparison with the ex periment is analyzed also.