Magnetic random access memory that uses magnetic tunnel junction memory cells is a high performance, non-volatile memory technology that goes beyond traditional charge-based memories. Today its speed is limited by the high magnetization of the memory storage layer. Here we show that fast and highly reliable switching is possible using a very low magnetization ferrimagnetic Heusler alloy, Mn3Ge. Moreover, the tunneling magnetoresistance is the highest yet achieved for a ferrimagnetic material at ambient temperature. Furthermore, the devices were prepared on technologically relevant amorphous substrates using a novel combination of a nitride seed layer and a chemical templating layer. These results show a clear path to the lowering of switching currents using ferrimagnetic Heusler materials and, therefore, to the scaling of high performance magnetic random access memories beyond those nodes possible with ferromagnetic devices.
@article{arxiv.2403.08112,
title = {Ferrimagnetic Heusler tunnel junctions with fast spin-transfer torque switching enabled by low magnetization},
author = {Chirag Garg and Panagiotis Ch. Filippou and Ikhtiar and Yari Ferrante and See-Hun Yang and Brian Hughes and Charles T. Rettner and Timothy Phung and Sergey Faleev and Teya Topuria and Mahesh G. Samant and Jaewoo Jeong and Stuart S. P. Parkin},
journal= {arXiv preprint arXiv:2403.08112},
year = {2024}
}
Comments
main manuscript 14 pages, 4 main figures and supplementary information. Submitted to Nature naotechnology