Wang Zi-xin, Li Jia-ming, Deng Jun-qi, Chen Zhi-feng, Lai Tian-shu
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
Rev Sci Instrum. 2011 Mar;82(3):034703. doi: 10.1063/1.3565156.
An alternating magnetic field (AMF) apparatus is developed and composed of an electromagnet and driving power supply. The structure of the electromagnet and configuration of the driving supply are described in detail. The apparatus can produce a peak magnetic field up to 9000 Oe and above under a small driving power at its resonance frequency of 1.14 kHz. Based on synchronization between the AMF and the femtosecond laser pulse train, a photomagnetic synchronized time- and high-field-resolved all-optical pump-probe magnetic-optical setup is developed. This setup has the ability to reinitialize any magnetic states between two successive laser pulses so that irreversible magnetization reversal dynamics can be studied. Dynamic Kerr hysteresis loops and magnetization reversal dynamics of high coercivity ferromagnetic TbFeCo and FePt films are demonstrated using this setup, showing importance of this synchronized time- and high-field-resolved all-optical pump-probe magnetic-optical setup in the research of ultrafast magnetization dynamics.
研制了一种交变磁场（AMF）装置，它由一个电磁铁和驱动电源组成。详细描述了电磁铁的结构和驱动电源的配置。该装置在其1.14kHz的共振频率下，在小驱动功率下可产生高达9000奥斯特及以上的峰值磁场。基于交变磁场与飞秒激光脉冲序列之间的同步，开发了一种光磁同步时间和高场分辨全光泵浦-探测磁光装置。该装置能够在两个连续激光脉冲之间重新初始化任何磁状态，从而可以研究不可逆的磁化反转动力学。利用该装置展示了高矫顽力铁磁TbFeCo和FePt薄膜的动态克尔磁滞回线和磁化反转动力学，表明这种同步时间和高场分辨全光泵浦-探测磁光装置在超快磁化动力学研究中的重要性。
