For most of us, storing and accessing the vast majority of our computer data involves using either hard disk or solid state drives or perhaps a combination of both. Each method boasts its own advantages and while the battle for storage supremacy between the two rages in public, research at Japan's Tohoku University has revealed another option. Using a pulse generator to alter the electrical state of tiny dots on a ferroelectric medium, Kenkou Tanaka and Yasuo Cho have successfully recorded data at around eight times the density of currently available hard disk drives.
For primary computer data storage at the moment, there are really only two contenders fighting for public domination. Hard disk drives magnetically encode data onto spinning platters, which is subsequently read by detecting those magnetized areas and translating it back into something usable. Solid state drives work by electronically altering the state of flash memory cells and then transform all the positive and negative cells into something that the computer can understand. Although the adoption of solid state drives is slowly beginning to spread, most of our computer systems still currently use voluminous spinning disks to store the various pieces of our digital lives.
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The scientists used a Scanning Nonlinear Dielectric Microscope as the storage and playback apparatus. Writing data involved sending relatively large voltage pulses through a pulse generator to a 30nm Lithium Tantalate medium. The tiny cantilever tip of the pulse generator successively alters the electric polarization and nonlinear dielectric constant of tiny spots on the ferroelectric medium, where positive voltage pulses represent a "1" data bit and negative pulses represent "0".
Tanaka and Cho also experimented with various pulse amplitudes and came up with a method for reducing the incidence of miswritten dots where close write proximity caused the polarized regions to expand to such an extent that individual bits were not distinct. Cho said: "We expect this ferroelectric data storage system to be a candidate to succeed magnetic hard disk drives or flash memory, at least in applications for which extremely high data density and small physical volume is required."
Research continuesHowever, improvements and fine tuning of such things as accuracy and speed will need to be made before such a storage system can be primed for commercial development.
In related news, it would appear that existing magnetic technologies are not going to be superseded without a fight as Toshiba recently unveiled a prototype magnetic storage technology capable of cramming 2.5Tb of data into a square inch.
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