论文部分内容阅读
使用飞秒时间分辨抽运-探测磁光克尔光谱技术,研究了激光加热GdFeCo磁光薄膜跨越铁磁补偿温度时稀土-过渡金属(RE-TM)反铁磁交换耦合行为和超快磁化翻转动力学.实验观察到由于跨越铁磁补偿温度、净磁矩携带者交换而引起的磁化翻转反常克尔磁滞回线以及在同向外磁场下,反常回线上大于和小于矫顽力部分的饱和磁化强度不同,显示出GdFeCo中RE与TM之间的非完全刚性反铁磁耦合.在含有Al导热底层的GdFeCo薄膜上观测到饱和磁场下激光感应磁化态翻转及再恢复的完整超快动力学过程.与剩磁态的激光感应超快退磁化过程比较,发现外磁场似乎并不影响磁畴结核和扩张速率,只影响磁化方向.
Using femtosecond time-resolved pumping-detection magneto-optical Kerr spectroscopy, the RE-TM anti-ferromagnetic exchange coupling behavior and ultrafast magnetization reversal of the laser-heated GdFeCo magneto-optical thin film across the ferromagnetic compensation temperature Kinetics.Experimental results show that due to the exchange of net moment carriers and the exchange of net moment carriers, the Kerr hysteresis loop due to the crossing of the temperature and the external magnetic field is greater than and less than the coercive force Shows a non-complete rigid anti-ferromagnetic coupling between RE and TM in GdFeCo. The complete ultrafast laser induced magnetization state reversal and re-recovery under a saturated magnetic field was observed on the GdFeCo films containing Al-conducting underlayer Kinetic process.Compared with the ultra-fast demagnetization of laser-induced demagnetization, it is found that the external magnetic field does not seem to affect the magnetic domain nodules and the expansion rate, and only affects the magnetization direction.