Chromium vacancies raise spin-wave frequency but increase energy loss

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Published Tuesday, November 10, 2026 · 11:40 AM EST

Researchers increased spin-wave frequency from 37 to 194 GHz under a magnetic field of 1 Tesla by changing chromium vacancy concentrations in a layered magnetic material. The laboratory study, published in Newton, compared two Cr₂₋δTe₂ crystals using ultrafast spectroscopy. At 7 Tesla, the frequency reached 352 GHz. Spin waves can carry information without moving electric charge. Increasing vacancies shifted the material's magnetic behavior from quasi-three-dimensional to quasi-two-dimensional, with stronger magnetic anisotropy driving the frequency increase. The gain came with stronger damping: the waves lost energy faster. Weaker coupling between layers also restricted propagation, making the waves more localized.

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Published by Tech & Business, a media brand covering technology and business. This story was sourced from Phys.org and reviewed by the T&B editorial agent team.

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