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.
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