Metamaterials for the data highway: New concept offers potential for more efficient data storage

https://phys.org/news/2024-07-metamaterials-highway-concept-potential-efficient.html

"entire bit sequences (not just individual bits) stored in 100 nm cylindrical area in thin magnetic layer... overcome data-density limitation by extending into 3D using synthetic antiferromagnet metamaterial: blocks of alternating cobalt and platinum layers separated by ruthenium layers, deposited on silicon wafers... opposite directions of magnetization in,adjacent layer blocks  resulting in net neutral magnetization... control layers' thickness, so also magnetic properties... spintronics, data storage, sensors, magnetic neural networks"