A recent discovery at the Indian Institute of Science (IISc) offers an energy-efficient method to achieve glassy transformations in indium selenide, a material that could change the face of data storage technology. The study was conducted in a collaboration between the University of Pennsylvania and the Massachusetts Institute of Technology (MIT). The research demonstrates that continuous electric current can transform the crystalline structure of indium selenide into glass, using a billion times less energy than the traditional melt-quench process.
Unusual Transformation Mechanism Revealed
The study, published on November 6, 2024, in Nature, details how this crystalline-to-glass transformation in indium selenide occurs. The study claims that unlike conventional processes that require high temperatures and sudden cooling, researchers found that mechanical shocks triggered by continuous electric currents achieved the same result. This discovery eliminates the need for the energy-intensive heating and rapid cooling stages typically used to create glassy phases in materials. Gaurav Modi, former PhD student at Penn Engineering, expressed initial surprise at the finding, noting that a continuous current alone disrupted the material's structure.
Collaborative Microscale Analysis
IISc's in situ microscopy tools were used extensively to observe the transformation at both atomic and micrometer scales. Assistant Professor Pavan Nukala from IISc's Centre for Nano Science and Engineering, with PhD student Shubham Parate, collaborated with Penn Engineering's Srinivasa Ramanujan Distinguished Scholar, Ritesh Agarwal, to investigate the transformation. By passing electric current through indium selenide, the team discovered that the 2D material's layers moved against each other, generating small-scale electrical and mechanical shocks similar to seismic activity, ultimately leading to glass formation.
Future Implications for Phase-Change Memory
According to Agarwal, energy requirements have been a limiting factor for phase-change memory devices in widespread applications. This discovery, therefore, has significant implications for the efficiency of data storage technologies in computers and mobile devices. Nukala has indicated that the next steps will involve efforts to integrate these materials with CMOS technology, potentially paving the way for more sustainable memory solutions.
