Transition metal synthetic ferrimagnets: tuneable media for all-optical switching driven by nanoscale spin current
Da̧browski, M; Scott, JN; Hendren, WR; et al.Forbes, CM; Frisk, A; Burn, DM; Newman, DG; Sait, CRJ; Keatley, PS; N’Diaye, AT; Hesjedal, T; van der Laan, G; Bowman, RM; Hicken, RJ
Date: 26 October 2021
Journal
Nano Letters
Publisher
American Chemical Society
Publisher DOI
Abstract
All-optical switching of magnetization has great potential for use in future ultrafast
and energy efficient nanoscale magnetic storage devices. So far, research was almost
exclusively focused on rare-earth based materials, which limits device tunability and
scalability. Here, we show that a perpendicularly magnetized synthetic ...
All-optical switching of magnetization has great potential for use in future ultrafast
and energy efficient nanoscale magnetic storage devices. So far, research was 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 sub-nanometer Ir layer. The magnetic properties of this model system may
be tuned continuously via sub-nanoscale 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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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