Synthetic antiferromagnetic layer based on Pt/Ru/Pt spacer layer with 1.05 nm interlayer exchange oscillation period for spin–orbit torque devices

Interlayer exchange coupling in transition metal multilayers has been intensively studied for more than three decades and is incorporated into almost all spintronic devices. With the current spacer layers, only collinear magnetic alignment can be reliably achieved; however, controlling the coupling angle has the potential to markedly expand the use of interlayer exchange coupling. Here, we show that the coupling angle between the magnetic moments of two ferromagnetic layers can be precisely controlled by inserting a specially designed magnetic metallic spacer layer between them. The coupling angle is controlled solely by the composition of the spacer layer. Moreover, the biquadratic coupling strength, responsible for noncollinear alignment, is larger than that of current materials. These properties allow for the fabrication and study of not yet realized magnetic structures that have the potential to improve existing spintronic devices.

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Very strong antiferromagnetic interlayer exchange coupling with iridium spacer layer for perpendicular magnetic tunnel junctions

Applied Physics Letters ◽

10.1063/1.4977565 ◽

2017 ◽

Vol 110 (9) ◽

pp. 092406 ◽

Cited By ~ 30

Author(s):

Kay Yakushiji ◽

Atsushi Sugihara ◽

Akio Fukushima ◽

Hitoshi Kubota ◽

Shinji Yuasa

Keyword(s):

Exchange Coupling ◽

Tunnel Junctions ◽

Magnetic Tunnel Junctions ◽

Interlayer Exchange Coupling ◽

Spacer Layer ◽

Interlayer Exchange

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Whirling interlayer fields as a new source of stable topological order in moiré CrI3

10.21203/rs.3.rs-1001541/v1 ◽

2021 ◽

Author(s):

Doried Ghader ◽

Bilal Jabakhanji ◽

Alessandro Stroppa

Keyword(s):

Ground State ◽

Nearest Neighbor ◽

Current Knowledge ◽

Orbit Coupling ◽

Coupling Mechanism ◽

Spin Orbit Coupling ◽

Topological Order ◽

Spin Orbit ◽

Interlayer Exchange ◽

And Control

Abstract The moiré engineering of two-dimensional magnets opens unprecedented opportunities to design novel magnetic states via the stacking-dependent magnetism. Here, we explore the formation and control of ground state topological spin structures (TSTs) in moiré CrI3 without including the nearest-neighbor (NN) Dzyaloshinskii-Moriya interactions (DMI) and dipolar interactions in the theoretical approach. Using stochastic Landau-Lifshitz-Gilbert simulations, we unveil the emergence of vortex and antivortex interlayer exchange fields at large moiré periodicity. The whirling fields stabilize spontaneous and field-assisted ground state TSTs with various topologies, including skyrmionic clusters with high topological charges. Furthermore, by examining the effect of the Kitaev interaction and the next NN DMI, we propose the latter as the unique spin-orbit coupling mechanism compatible with the experimental results on monolayer and twisted CrI3. Therefore, our study goes beyond the current knowledge about TSTs in moiré magnets, opens exciting opportunities for moiré skyrmionics, and uncovers the spin-orbit coupling in CrI3.

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