非線形誘電率顕微鏡を用いた超高密度強誘電体記録

抄録

Ferroelectrics has generated considerable interest as promising storage media. In this paper, an investigation of ultrahigh-density ferroelectric data storage based on scanning nonlinear dielectric microscopy (SNDM) was carried out. For the purpose of obtaining fundamental knowledge of high-density ferroelectric data storage, several experiments on nanodomain formation in lithium tantalate (LiTaO₃) single crystal were conducted. As a result, a very small inverted domain with a radius of 6 nm was successfully formed in stoichiometric LiTaO₃ (SLT), and in addition, a domain dot array with an areal density of 1.5 Tbit/inch² was formed on congruent LiTaO₃ (CLT). Moreover, it was found that fast nanosecond domain switching could be achieved by reducing the sample thickness of CLT plate. Additionally, the first prototype high-density ferroelectric data storage system was developed. Using this system, writing data transfer rates were evaluated and 256×256 bit data were recorded with the areal densities of 258 Gbit/inch² and 717 Gbit/inch².