Transition Metal Synthetic Ferrimagnets: Tunable Media for All-Optical Switching Driven by Nanoscale Spin Current

Maciej Da̧browski, Jade N. Scott, William R. Hendren, Colin M. Forbes, Andreas Frisk, David M. Burn, David G. Newman, Connor R. J. Sait, Paul S. Keatley, Alpha T. N’Diaye, Thorsten Hesjedal, Gerrit van der Laan, Robert M. Bowman, Robert J. Hicken

Research output: Contribution to journalArticlepeer-review

Abstract

All-optical switching of magnetization has great potential for use in future ultrafast and energy efficient nanoscale magnetic storage devices. So far, research has been almost exclusively focused on rare-earth based materials, which limits device tunability and scalability. Here, we show that a perpendicularly magnetized synthetic ferrimagnet composed of two distinct transition metal ferromagnetic layers, Ni3Pt and Co, can exhibit helicity independent magnetization switching. Switching occurs between two equivalent remanent states with antiparallel alignment of the Ni3Pt and Co magnetic moments and is observable over a broad temperature range. Time-resolved measurements indicate that the switching is driven by a spin-polarized current passing through the subnanometer Ir interlayer. The magnetic properties of this model system may be tuned continuously via subnanoscale changes in the constituent layer thicknesses as well as growth conditions, allowing the underlying mechanisms to be elucidated and paving the way to a new class of data storage devices.
Original languageEnglish
JournalNano Letters
Early online date26 Oct 2021
DOIs
Publication statusEarly online date - 26 Oct 2021

Keywords

  • magnetism
  • Condensed Matter Physics
  • General Materials Science
  • OPTICAL-PROPERTIES
  • magnetic thin films
  • magnetic

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