ON THE QUASI-STOCHASTIC BEHAVIOR OF NONLINEAR MAGNETIZATION OSCILLATIONS IN ORTHORHOMBIC FERROMAGNETS INDUCED BY A MAGNETIC PULSE FIELD

It is shown that large oscillations of magnetization (induced by fast changes of external magnetic field) in ferromagnets, of orthorhombic s ymmetry can show quasistochastic features: a slight deviation in initi al state essentially changes the magnetization behavior for t --> infi nity. In contrast to the simplest uniaxial anisotropy case (where the quasistochastic behavior should be expected only after switching the i n-plane field on), the presence of orthorhombic anisotropy creates the new possibility of quasistochastic excitation after switching the ext ernal field off. This anisotropy component may also considerably chang e the ranges of quasistochastic behavior.