Unusual Hysteresis Loop of (Tb0.2Pr0.8)(Fe0.4Co0.6)1.9−x C x in Pulsed High Magnetic Field

The magnetization properties of (Tb0.2Pr0.8)(Fe0.4Co0.6)1.9−x C x ( $x=0$ –0.5) were investigated in a pulsed high magnetic field. Obvious unsymmetry magnetic hysteresis loops were observed, in which the magnetization measured in the second(negative) magnetic field route was larger than that measured in the first(positive) one. Meanwhile, the unsymmetry of the hysteresis loops was C doping levels, magnetic fields and temperatures dependent. The experimental results suggest that the unusual hysteresis phenomenon result mainly from the collapse of the pinning center and the formation of ferromagnetic(FM) pseudo-domain.