Abstract
The physical mechanism of recoil hysteresis loops has been subject to dispute in recent years. This paper deals with the origin of recoil hysteresis in nanocomposite Pr8Fe87B5 magnets. It is shown by investigating the recoil loops and magnetic activation of melt-spun ribbon of Pr8Fe87B5 at different temperatures that the openness of recoil hysteresis loops is strongly dependent on the magnetic activation as the negative field (opposite to magnetization) is cycled to zero in a remanent state. The hysteresis of recoil loops originates from the reversible magnetization reversal of hard phase, which is probably caused by the energy of isotropic exchange coupling overcoming the energy barrier of magnetocrystalline anisotropy. So, the hysteresis is codetermined by the exchange coupling and variation of anisotropy, thus the openness has a linear relationship with the product of magnetic moments of activation and reversible susceptibility.
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