AMANY-BODY UNIVERSAL APPROACH TO THERMALLY ACTIVATED MAGNETOELASTIC RELAXATION IN FERROMAGNETIC ALLOYS
热激活磁弹性弛豫的多体普适方法研究

The rmally activated magnetoelastic relaxation in disordered ferromagnetic alloys is studied by using a new relaxation mechanism based on the concept of many-body interaction leading to an infrared divergence response. It nas been found that except the thermally assisted transitions of directional ordered atoms, the directional ordering, which causes a relaxation behavior of magnetic domain walls, includes two different classes of configurational tunnelling caused by many-body interactions. Based on this mechanism, a new relaxation law of magnetization and a new formula of magnetic disaccommodation were derived. Using Boltzmann superposition principle, an universal formula of internal friction was also derived, which was verified by experimental date.