Development of sharpened fiber probe head and its application to nano-size magnetic recording system

在本研究中，提出一种新型的单磁极阅读写磁头，使用超尖锐光纤探针。提出了一种涂有软磁薄膜并绕有激励线圈的超尖锐光纤探针作为写入头。有限积分单元法（FEM）阐明了覆盖光纤探头的软磁材料（例如软铁氧体）的芯对增强由探头产生的磁场起重要作用。磁场变得比没有软磁芯的情况大8倍。预计这种具有软磁芯的探头可以高分辨率地写入介质中的磁畴。采用覆盖有磁光敏感层的探头作为读出头。由于记录的图案将被转录到探头尖端的磁光传感层中，因此穿过光纤芯的入射偏振光将与传感层相互作用。将执行检测以读出光纤的另一边缘处的反射光的克尔旋转角。尽管该系统还存在许多问题需要解决，但这种磁头可以成为未来超高密度磁记录的候选磁头之一。

In this research, a new type of both reading and writing single pole heads using ultra sharpened optical fiber probes were proposed. The ultra sharpened fiber probe coated with soft magnetic thin film and wound around by an exiting coil was proposed as writing head. A finite integration element (FIM) method clarified that the core of soft magnetic material, such as soft ferrite, which covers the fiber probe head, played an important role to enhance the magnetic field generated by the head. The magnetic field became eight times as large as that of the case without soft magnetic core. It is predicted that this kind of probe head with soft magnetic core can write the magnetic domains in the medium at high resolution. The probe head covered with magneto-optical sensing layer was used as read-out head. Since the recorded pattern will be transcribed into the magnet-optical sensing layer on the probe tip, the incident polarized light passed through fiber core will interact with the sensing layer. The detection will be performed to read out the Kerr rotation angle of the reflected light at the another edge of the fiber. Although there are many problems to be solved in this system, this type of heads can be one of the candidates for ultra high density magnetic recording in the future.