Orbital currents provide a new way to manipulate magnetism in electronic devices
In short: Researchers who studied magnetic bilayers found that orbital currents can exert torque on magnetization, similar to how spin currents do. By examining various ferromagnet and heavy metal combinations, the team identified a specific contribution from the orbital Hall effect that competes with the more commonly known spin Hall effect.
This discovery is significant because it suggests that orbital engineering could be used to develop new types of spintronic devices. The study specifically looked at Ni/Ta bilayers and found that the net torque was opposite to what spin Hall theory predicted, aligning instead with orbital Hall theory.
The researchers used both theoretical analysis and experimental measurements to observe these effects in different material combinations. A limitation of this work is that it focuses on specific bilayer configurations to isolate these competing forces.
Why it matters: Understanding how orbital currents influence magnetism opens new doors for designing faster and more efficient electronic components.
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Sources
- Source: Research: Lee et al. (2021). Orbital torque in magnetic bilayers. Nature Communications. · cc-by
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