Science, Space and Technology News 2024
A breakthrough in spintronics has been achieved by modifying LEDs to control electron spin using a new chiral material, enabling more efficient data processing and promising advancements in electronic device capabilities. . Credit: SciTechDaily.com
A major barrier to commercial spintronics is setting and maintaining the electron spin orientation. Most devices tune spin orientation using ferromagnets and magnetic fields, a burdensome and unreliable process. Decades of research have shown that carriers lose their spin orientation moving from materials with high conductivity to low conductivity—for example, from metallic ferromagnets to undoped silicon and conjugated polymer materials that make up most modern semiconductors.
Stack of the spin-LED emitting circularly polarized electroluminescence. The acts as a spin filter, allowing only polarized carriers to flow through the LED and recombine in the multiple quantum wells s emitting circularly polarized light . Credit: Hautzinger, M. et al. Nature Chemists from the NERL fabricated the spin LEDs by stacking several layers, each with specific physical properties. The first layer is a common transparent metallic electrode; the second layer’s material blocks electrons having spin in the wrong direction, a layer that the authors call a chirality-induced spin filter. The spin-aligned electrons then recombine in the third layer, a standard semiconductor used as an active layer in regular LEDs.
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