source:phys.orgErbium-doped fiber amplifiers (EDFAs) are devices that can provide gain to the optical signal power in optical fibers. They are often used in long-distance communication fiber optic cables and fiber-based lasers. Invented in the 1980s, EDFAs have profoundly impacted our information society enabling signals to be routed across the Atlantic and replacing electrical repeaters.What is interesting about erbium ions in optical communications is that they can amplify light in the 1.55 mm wavelength region, which is where silica-based optical fibers have the lowest transmission loss. Th...
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Energy From Vibrating Micromagnets Power the Wireless Sensors in the Most Efficient Way source:azomThe Internet of Things, or the wireless interconnection of everyday objects, is based on wireless sensor networks, which require a low but consistent supply of electrical energy. Electromagnetic energy harvesters, which produce energy straightforwardly from the environment, can provide this.Lise-Marie Lacroix of the Université de Toulouse in France worked with colleagues from Toulouse, Grenoble, and Atlanta, Georgia, to improve the design of one such energy harvester so that it produces...
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2022
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source:cdotrendsRecently, CDO Trends covered a scheme to site data centers on the moon. Farfetched?Consider this: to what lengths will humanity go for essential minerals once we've exhausted our Earth's supply?Worth your saltWe humans suffer from normalcy bias: we tend to reject sudden changes in our paradigms. For example, we're accustomed to purchasing standard items on the regular. Let's say that our local supermarket has no salt for sale on any given day — we're shocked and surprised but expect that another outlet will, or that salt will be restocked in short order.We d...
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source:natureAbstractWe investigate the interplay of magnetization and lattice vibrations in rare-earth orthoferrites RFeO3, with a specific focus on non-symmetry-breaking anomalies. To do so, we study the magnetization, magnon excitations and lattice dynamics as a function of temperature in NdFeO3, TbFeO3, EuFeO3 and GdFeO3. The magnetization shows distinct temperature anomalous behavior for all investigated rare-earth orthoferrites, even in the compounds with no phase transitions occurring at those temperatures. Through spin–phonon coupling, these magnetic changes are mirrored by the FeO6 ro...
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2022
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