Abstract: The rapid development of modern information technology demands more and more data storage capacity and storage speed. However, with the development of storage technology toward ultra-high density and super-high speed, on the one hand, the magnetic recording density has also approached the superparamagnetic limit (100 Gbpsi). To further improve the recording density, a recording medium with high coercivity must be adopted, but the current magnetic head can not provide a writing magnetic field which can overcome the high coercivity. On the other hand, the magnetic recording speed has slowed down due to the magnetization reversal speed. Therefore, the development of new ultra-high density, ultra-high speed recording technology has become a new challenge in the field of modern information technology. The realization of femtosecond laser ultrafast thermally induced all-optical magnetization switching paved the way to develop the ultra-high density ultrafast-rate recording material, and thus became a hot topic of magnetic information storage research. The new magnetic recording technique uses femtosecond linearly polarized light to heat magneto-optical material GdFeCo ferromagnetic thin films directly to achieve all-optical magnetization switching, which is based on spin exchange between ferromagnetic lattices and occurs in picosecond ultrafast time scale. It is considered to be an important achievement in the development of a new generation of ultra-high-speed storage technology because of its simple structure, low cost, and high storage speed. However, in order to promote the realization of the new all-optical magnetic recording technology, it is necessary not only to understand the physical mechanism of the origin of the ultrafast thermally induced magnetization switching of femtosecond laser, but also to clarify the specific realization process of the magnetization switching, and to clarify the realization conditions and influencing factors of the all-optical magne-tization switching. Requirements for structural parameters and material properties of the materials used, as and the pulse width and flunence, as well as the effects of these material parameters and laser conditions on the switching speed of ultrafast thermally induced all-optical magnetization switching. Only by understanding the mechanism of ultrafast thermally induced magnetization switching and the influencing factors of all-optical magne-tization switching can we really promote the development of new ultra-high density and ultra-high speed all-optical magnetic recording technology. Here the technical characteristics and physics mechanism of ultrafast thermal induced magnetization switching for rare earth-transition metal GdFeCo ferrimagnetic films are discussed in detail. The requirements of material properties and pump laser for ultrafast thermal induced magnetization switching are further studied. Finally, an obvious barrier to high density recording is pointed for the use of large amorphous structures, and the solution to the issue is further proposed. The results are expected to help to develop new ultrahigh-density and ultrafast-rate recording material and technology.
作者简介: 徐初东,华南农业大学电子工程学院副教授、硕士研究生导师。2002年7月中山大学理工学院本科毕业并保送中山大学读研,2005年7月获中山大学工学硕士学位,硕士毕业后在华南农业大学工作。工作期间,2007年9月至2012年7月在中山大学读博,并获光学博士学位,2014年9月至2016年8月获国家留学基金委资助在英国约克大学超快磁学计算实验室进行博士后研究工作。工作至今主持国家自然科学基金一项,广东省自然科学基金三项。主要从事飞秒激光诱导超快磁记录的研究工作。近年来,在著名物理以及材料类期刊发表论文20余篇,包括Physical Review B、Applied Physics Letter、Journal of Magnetism and Magnetic Materials、Applied Physics Express、Science of Advanced Materials和Optical Materials Express等。 熊万杰,华南农业大学电子工程学院副教授、硕士研究生导师。2000年6月于湖北师范学院物理学本科毕业,2003年获南京师范大学硕士学位,2012年获中山大学凝聚态物理博士学位,2014年6月至2015年6月获国家留学基金委资助在美国佐治亚大学进行访问研究。2003年7月进入华南农业大学工作至今,先后主持国家自然科学基金、广东省科学计划基金各一项,发表论文近20篇。主要从事磁性材料的相变和磁记录的研究工作。
引用本文:
徐初东,陆胜东,熊万杰. 飞秒激光超快热诱导全光磁化反转研究进展[J]. 材料导报, 2019, 33(15): 2561-2564.
XU Chudong, LU Shengdong, XIONG Wanjie. Research Progress on Femtosecond Laser Ultrafast Thermally Induced All-optical Magnetization Switching. Materials Reports, 2019, 33(15): 2561-2564.
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2019, Vol. 33 
