Science, Space and Technology News 2024
Information is stored by the depth-dependent direction of magnetization in the domain walls, which are located between the cylinder domains and their surroundings. This magnetization of the domain walls can point clockwise or counterclockwise in the individual blocks, which are separated vertically by ruthenium layers. By systematically varying these directions, researchers can encode different bit sequences within a cylinder domain, as is shown here with some artistic interpretation.
The resulting metamaterial is a synthetic antiferromagnet. Its special feature is a vertical magnetization structure in which adjacent layer blocks have opposite directions of magnetization, resulting in a net neutral magnetization overall.“This is where the concept of the ‘racetrack’ memory comes in. The system is like a racetrack, along which the bits are arranged like a string of pearls.
Reference: “Multilayer Metamaterials with Ferromagnetic Domains Separated by Antiferromagnetic Domain Walls” by Ruslan Salikhov, Fabian Samad, Sebastian Schneider, Darius Pohl, Bernd Rellinghaus, Benny Böhm, Rico Ehrler, Jürgen Lindner, Nikolai S. Kiselev and Olav Hellwig, 13 May 2024,SciTechDaily: Home of the best science and technology news since 1998. Keep up with the latest scitech news via email or social media.
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