SPM-based data storage for ultrahigh density recording

Abstract

The possibility of SPM-based data storage is described regarding both its recording density and readout speed for ultrahigh density data storage. We consider their gap control to achieve high-speed readout. Suitable SPM-based storages are selected and their details are studied. As a result, scanning near-field optical microscope (SNOM)-and atomic force microscope (AFM)-based storages are expected to be candidates for future storage. SNOM-based storage is for 100 Gb in −2 . AFM-based storage is for 1 Tb in −2 . Using new force modulation AFM pit recording, an ultrahigh recording density of 1.2 Tb in −2 and a readout speed of 1.25 Mb s −1 are demonstrated.

Ultrathin Ferroelectric P(VDF/TrFE) Copolymer Film in Low‐Cost Non‐Volatile Data Storage Applications

“…[1] Advanced local probing technique in scanning probe microscopy (SPM) has led many researchers to propose SPM-based ultrahigh density data storage devices using scanning tunneling microscope (STM), atomic force microscope (AFM), electrostatic force microscope (EFM), scanning capacitance microscope (SCM), magnetic force microscope (MFM), and scanning near-field optical microscope (SNOM). [2][3][4][5] More recently, IBM and LG have demonstrated a low power SPM probe-based high density data storage system using a new read-write mechanism called ''Thermo-piezoelectric method'' in which the cantilever tip equipped with a heater is used for making an indentation (stands for a logical '1') on a PMMA film. [6,7] However, the main drawback is that writing data by this thermal method changes the polymer surface morphology and limits its usage to Write-Once-ReadMany (WORM) applications.…”

Recent developments in nanofabrication using scanning near-field optical microscope lithography

“…Furthermore, Betzig et al [22] and Hosaka et al [23] have studied the possibility of using the MO change and phase change, respectively, for SNOM-based data storage. Betzig et al [22] used an SNOM to image and record domains in a MO (Co/Pt multilayer) film with a resolution of 30-50 nm in the writing mode and 60 nm in the recording mode, which can achieve a data density equivalent to 7 Gbits/cm 2 .…”

Bionanofabrication by Near-Field Optical Methods

“…Other approaches to patterning using SNOM instrumentation have been explored, including the ablation of dye molecules and other crystalline organic molecules form surfaces [53], thermal modification [54,55], and selective photooxidation of polymers [56][57][58]. However, a charac- teristic of all of these studies has been a failure to yield the kind of resolution that has been realized using other forms of SPM lithography.…”