Experimental study on shock wave demagnetization of Nd₂Fe₁₄B hard ferromagnetic

For the study of the demagnetization performance of Nd₂Fe₁₄B ferromagnetic under shock wave loading, the plane shock wave loading experiment device was established, and the shock demagnetization experiments were conducted. The electromotive forces were measured, and the shock demagnetization time and pulse width were obtained. The demagnetization rates with different shock wave pressures were discussed, and the effects of magnet sizes on the electromotive force were analyzed. The results show that the time is about 0.28 μs between the shock wave loading Nd₂Fe₁₄B ferromagnetic and shock demagnetization occurring. The critical pressure of demagnetization is lower than 8.52 GPa. The electromotive force increases with the increase of the magnet diameter and the decrease of the magnet height.