超高密度记录介质的圆偏振光累积磁开关
Accumulative magnetic switching of ultra-high-density recording media by circularly polarized light
摘要：
通过磁场以外的外部能量（例如自旋极化电流1 -4、电压5，6和圆偏振光7 -11）来操纵磁化，给出了磁性纳米器件的范式转变。利用圆偏振光控制铁磁材料的磁化强度，不仅是研究光磁相互作用的基础，而且是未来高密度磁纪录技术的发展方向，因此受到越来越多的关注。在这里，我们表明，颗粒FePt薄膜，设计用于超高密度记录，光磁开关由圆偏振光是一个累积效应，从多个光脉冲。我们进一步表明，高各向异性材料的圆偏振光和适度的外部磁场的组合的确定性开关，从而揭示了技术实现的途径。
英文摘要：
Manipulation of the magnetization by external energies other than magnetic field, such as spin-polarized current1-4, electric voltage5,6 and circularly polarized light7-11 gives a paradigm shift in magnetic nanodevices. Magnetization control of ferromagnetic materials only by circularly polarized light has received increasing attention both as a fundamental probe of the interactions of light and magnetism but also for future high-density magnetic recording technologies. Here we show that for granular FePt films, designed for ultrahigh-density recording, the optical magnetic switching by circularly polarized light is an accumulative effect from multiple optical pulses. We further show that deterministic switching of high anisotropy materials by the combination of circularly polarized light and modest external magnetic fields, thus revealing a pathway towards technological implementation.
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