Light-based method generates persistent nanoscale magnetic fields without external magnets
Cornell University researchers have demonstrated a way to generate strong, localized static magnetic fields using only light, without external magnets or magnetic materials, an approach they say could advance spintronics, magnetic data storage, and photonic and quantum computing.
Illustration of the metasurface designed to control infrared light. Laser pulses can selectively activate regions of the material, allowing researchers to dynamically tune its optical properties. Image credit: Cornell University
The technique relies on what the team calls a “time interface.” Just as a light wave partially reflects and partially transmits when it crosses a spatial boundary, such as the surface between air and water, it does something analogous when it encounters a sudden change in the optical properties of the medium it’s traveling through over time, rather than in space. A sufficiently abrupt time interface can also excite a static, zero-frequency mode of the system, effectively pulling part of the light’s rapidly oscillating magnetic field out of circulation and freezing it into a stationary magnetic field pattern. Unlike more established light-driven magnetization methods such as the inverse Faraday effect, which tend to rely on the specific nonlinear optical properties of the material used, the team’s approach works with the geometry of an engineered surface rather than the material itself. “We used an approach known as localized free carrier generation, which has advantages over other methods of nanoscale magnetization,” author Shivaksh Rawat said. “One of the important contributions of our work is that our approach is material agnostic. Any non-metallic surface will work.”
Source: https://www.spintronics-info.com/light-based-method-generates-persistent-nanoscale-magnetic-fields-without
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