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Novel Broadband Terahertz Light Emitters

Broadband terahertz light emitters have been designed and fabricated using nanoscale U-shaped building blocks. The terahertz spectral range sits between infrared and typical radar frequencies, and the challenges of efficiently generating and detecting terahertz radiation has limited its use.  However, broadband terahertz sources offer exciting possibilities to study fundamental physics principles, to develop non-invasive material imaging and sensing, and make possible terahertz information, communication, processing and storage.

Tricking Iron into Acting like a Rare-earth Element

By slipping iron between two nitrogen atoms in a lithium matrix, researchers are able to trick iron into having magnetic properties like those of rare-earth elements.Rare-earth magnets are stronger than typical iron-based magnets and have high magnetic anisotropy, meaning they are easily magnetized in one particular direction.  Rare-earth elements are in high demand, difficult to find in large concentrations, and costly to mine.  Iron, in contrast, is abundant and cheap.  If iron can be made to behave like a rare-earth element, strong permanent magnets could be made without rare earths. 

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