Friday 14 March 2025
A remarkable breakthrough in the field of spintronics has been achieved by a team of scientists who have successfully demonstrated the existence of a giant orbital Hall effect (OHE) in silicon, a material previously thought to be incapable of exhibiting this phenomenon.
Spintronics is a rapidly advancing field that focuses on manipulating the spin of electrons to create new devices with improved performance and energy efficiency. The OHE is a key concept in spintronics, allowing for the generation of orbital currents in materials that can then be used to manipulate the magnetization of adjacent magnets.
In traditional spintronics, OHE has been observed in metals such as copper and gold, but these materials have significant limitations, including high power consumption and thermal instability. Silicon, on the other hand, is an attractive material for spintronic applications due to its low power consumption, high stability, and widespread availability.
The team of scientists used a novel experimental setup to demonstrate the OHE in silicon. They fabricated a device consisting of a thin layer of nickel (Ni) on top of a silicon substrate, with a carefully controlled thickness of 10 nanometers. The Ni layer was chosen for its strong magnetization properties, which allowed the team to measure the orbital currents generated by the OHE.
The experiment involved applying an external electric field to the silicon substrate, which generated a transverse orbital current via the OHE. This current then interacted with the magnetization of the Ni layer, causing it to precess (or wobble) at a frequency determined by the strength and direction of the electric field.
To measure this effect, the team used a technique called spin-torque ferromagnetic resonance (ST-FMR), which involves injecting an rf current into the Ni layer and measuring the resulting changes in its magnetization. The results showed a clear dependence on the angle of the external magnetic field, confirming the presence of OHE.
The implications of this discovery are significant, as it opens up new possibilities for the development of spintronic devices that can operate at room temperature with low power consumption. Silicon-based spintronics has the potential to revolutionize the field by providing a cost-effective and energy-efficient alternative to traditional metal-based spintronics.
Furthermore, the OHE in silicon could lead to the creation of novel devices such as orbital Hall effect transistors, which would enable more efficient manipulation of magnetization in spintronic applications.
Cite this article: “Unlocking Silicons Spintronics Potential: Giant Orbital Hall Effect Achieved”, The Science Archive, 2025.
Spintronics, Silicon, Giant Orbital Hall Effect, Ohe, Nickel, Spin-Torque Ferromagnetic Resonance, St-Fmr, Magnetic Field, Electric Field, Nanotechnology
