Terahertz electrical writing speed in an antiferromagnetic memory

Olejn�k, Kamil; Seifert, Tom; Ka�par, Zden?k; Nov�k, V�t; Wadley, Peter; Campion, Richard P.; Baumgartner, Manuel; Gambardella, Pietro; N?mec, Petr; Wunderlich, Joerg; Sinova, Jairo; Ku�el, Petr; M�ller, Melanie; Kampfrath, Tobias; Jungwirth, Tomas

Abstract

© 2018 American Association for the Advancement of Science. All rights reserved. The speed of writing of state-of-the-art ferromagnetic memories is physically limited by an intrinsic gigahertz threshold. Recently, realization of memory devices based on antiferromagnets, in which spin directions periodically alternate from one atomic lattice site to the next has moved research in an alternative direction. We experimentally demonstrate at room temperature that the speed of reversible electrical writing in a memory device can be scaled up to terahertz using an antiferromagnet. A current-induced spin-torque mechanism is responsible for the switching in our memory devices throughout the 12-order-of-magnitude range of writing speeds from hertz to terahertz. Our work opens the path toward the development of memory-logic technology reaching the elusive terahertz band.

Citation

Olejník, K., Seifert, T., Kašpar, Z., Novák, V., Wadley, P., Campion, R. P., Baumgartner, M., Gambardella, P., Němec, P., Wunderlich, J., Sinova, J., Kužel, P., Müller, M., Kampfrath, T., & Jungwirth, T. (2018). Terahertz electrical writing speed in an antiferromagnetic memory. Science Advances, 4(3), Article eaar3566. https://doi.org/10.1126/sciadv.aar3566

• Journal Article Type: Article
• Acceptance Date: Feb 8, 2018
• Online Publication Date: Mar 23, 2018
• Publication Date: Mar 2, 2018
• Deposit Date: Feb 3, 2020
• Publicly Available Date: Feb 3, 2020
• Journal: Science Advances
• Electronic ISSN: 2375-2548
• Publisher: American Association for the Advancement of Science
• Peer Reviewed: Peer Reviewed
• Volume: 4
• Issue: 3
• Article Number: eaar3566
• DOI: https://doi.org/10.1126/sciadv.aar3566
• Public URL: https://nottingham-repository.worktribe.com/output/1870753
• Publisher URL: https://advances.sciencemag.org/content/4/3/eaar3566