Draw data at the nanometer scale

Draw data at the nanometer scale

Draw nanoscale data

Left: Data storage using probe force. Right: data storage area drawn with a width of 10 nm or less. Credit: POSTECH

A method for drawing data in an area smaller than 10 nanometers has been proposed in a recent study published in Physical examination letters

A joint research team led by Prof. Daesu Lee (Department of Physics) of POSTECH, Prof. Se Young Park (Department of Physics) of Soongsil University and Dr. Ji Hye Lee (Department of Physics and Astronomy) of Seoul National University has proposed a method to densely store data by “pricking” with a pointed probe. This method uses a material in a metastable state, whose properties change easily even with slight stimulation.

A thin film of metastable ferroelectric calcium titanate (CaTiO3) allows polarization switching of a material even with slight pressure from a probe: A very weak force of 100 nanonewtons (nN) is more than sufficient. The joint research team succeeded in making the polarization path width less than 10 nm using this force and found a way to significantly increase the data storage capacity. Indeed, the smaller the size of the path, the more data the material can store.

The data storage capacity increased up to 1 terabit (Tbit)/cm as a result of drawing the data storage area using a probe on the thin film. This result is 10 times higher than that of a previous study (0.11 Tbit/cm²) which suggested a probe storage method using another material. Unlike the data storage method which uses electric fields, this probing method only requires a very small force, so the load on the device is also small.

The results of the study attract attention as they proved that the materials achieve superior performance in an unstable metastable state. The results should be applicable to next-generation electronic devices with improved integration and efficiency in the future.

Improved memory performance with strong ion bombardment

More information:
Ji Hye Lee et al, Mechanical Switching of Flexoelectricity-Based Polarization in Metastable Ferroelectrics, Physical examination letters (2022). DOI: 10.1103/PhysRevLett.129.117601

Provided by Pohang University of Science and Technology (POSTECH)

Quote: Drawing data at the nanometer scale (2022, September 30) retrieved October 1, 2022 from https://phys.org/news/2022-09-nanometer-scale.html

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