捕获电子辅助比特图纹磁记录技术

As main technolgy, the magnetic recording is still occupy 90% of market share of information storage. But, the magnetic recording is facing critical barrier on recording density improvement. one of the main issue is that recording head cannot write information to recording media which has very high magnetic anisotropy for ultra-high density recording. Assisted bit patterned magnetic recording can dramatically reduce the magnetic revering field of media without influence on thermal stability and signal-to-noise ratio. Thus, this kind of technology enable the recording density to be beyond 10 Tb/in2. .By using the structure of ferroelectric/ferromagnetic layers, the trapping electron assisted & bit patterned magnetic recording technology can modify the magnetic reversal field of recording media more precisely, this is because of that trapped electron can change the magnetic anisotropy of the crystalls. This technology can not only adjust the magntic switch field to work with different recording density, but also compatible with present industrial production process. This project will fabricate bit patterned magnetic recording media with ferroelectric/ferromagnetic multi-layer structure. Meanwhile, we will study the possibility and potential issues when we employ this technology to realize recording density over 10 Tb/in2.

占信息存储市场90%份额的磁盘记录技术面临着面记录密度提高的瓶颈，主要的挑战来自写入磁头不能在具有超高磁晶各向异性能的磁性介质上写入要存储的信息。辅助型比特图纹磁记录技术可以在不影响介质的热稳定性和信噪比的同时，大幅降低介质的磁化翻转场，有可能使得磁记录的面记录密度提高到10 Tb/in2以上的水平。.铁磁/铁电结构的捕获电子辅助比特图纹磁记录技术是基于磁性材料的晶格获得电子后磁晶各向异性将发生改变，从而通过铁电材料和外加电场双重调节记录介质磁化翻转磁场的方法，更准确和方便地适应不同写磁头的写入能力和各种记录密度的要求。该技术与现有磁记录技术完全兼容，无需对现有磁记录产业的设备等进行复杂的改造，没有明显的成本增加。本项目将制备铁磁/铁电结构的比特图纹磁记录介质，并系统研究该介质应用于10 Tb/in2的面记录密度的可行性和可能存在的问题，为磁记录技术中记录密度的进一步提高进行必要的探索。

本项目围绕捕获电子辅助比特图纹磁记录技术，在捕获电子对磁性薄膜磁性的调制、比特图纹磁记录介质的制备、比特图纹介质磁记录特性等方面取得了一系列有价值的进展。具体的成果主要包括：（1）通过非外延生长的方式获得了垂直各向异性FePt薄膜，并通过覆盖层成功实现了对薄膜磁性及微结构的调控；（2）在FePt/PMN-PT结构中实现了外加电场对薄膜磁性的调控，在FePt/PMN-PT(111)结构中电场能够使薄膜的矫顽力降低15%，其物理机制以电荷效应为主；在FePt/PMN-PT(001)结构中，电场能够使各向异性改变32%，其物理机制以应力效应为主；（3）在FeCo(CoNi)/PMN-PT（011）结构上成功实现了软磁薄膜中电场控制的90度磁矩翻转，并发现通过改变基片成分可以实现易失性和非易失性磁化翻转；（4）从实验和模拟两个方面研究了比特图纹磁记录介质的磁化翻转过程和读写特性。