Femtosecond Laser-Induced Magnetization Reversal Domain of Co-Sublattice in TbCo Film

• Published in: IEEE transactions on magnetics Vol. 53; no. 11; pp. 1 - 5
• Main Authors: Cheng, Weiming, Li, Xing, Hui, Yajuan, Dong, Kaifeng, Wang, Haiwei, Chen, Jincai, Xie, Changsheng, Miao, Xiangshui
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: All-optical switching; Distribution functions; Femtosecond pulsed lasers; Ferrimagnetism; Ferromagnetism; Graphical models; Laser excitation; laser fluence; Lasers; Magnetic fields; Magnetic moments; Magnetic storage; Magnetism; Magnetization; Magnetization reversal; Optical switching; reversal domain; Tb content; TbCo
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2017.2707640

All-optical switching (AOS) is an emerging recording technology by using femtosecond laser to manipulate the ultrafast magnetization reversal for future super high density magnetic storage. TbCo films possess a ferrimagnetic structure and large perpendicular anisotropy and, thus, become a potential material for AOS. In this paper, we simulate the ultrafast magnetization reversal domain of Co-sublattice in TbCo films under 100 fs pulse laser with a general theoretical framework, and our simulation results show that TbCo films irradiated with a higher power fluence laser have a larger reversal domain of Co-sublattice due to the higher peak temperature and the further critical isotherm of electrons. Moreover, high Co content can help Co-sublattice form a large reversal domain, but is unable to obtain the highly uniform reversal domain perhaps attributed to the insufficient anti-ferromagnetic interaction between Tb atoms and Co atoms.