source:natureYour smartphone begins life neatly packed into a well-designed box. Chances are it will end its days in a more ignominious manner.Assuming it doesn’t end up rattling around in a junk drawer, it will most likely go to the same landfill as your other household waste, where it will slowly leach toxic chemicals into the soil and water. Or worse, it might be shipped to another country, where low-income workers will manually break the phone apart to recover anything of value and burn or bury the rest, putting their health — and that of their wider community — at risk in the process. Mea...
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source:freethinkBy figuring out how to manufacture in the lab a rare mineral, previously found only in meteorites, two teams of researchers may have just helped secure America’s clean energy future. Permanent magnets: Of the 118 elements on the periodic table, 17 fall into the category of “rare earths,” and contrary to their name, these materials aren’t terribly rare — each is more common than gold, and one is more plentiful than even copper.Rare earth elements are used to make a slew of products, from smartphone screens to x-ray machines, but permanent magnets are arguably the most impor...
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source：natureAbstractIn spintronics, it is important to be able to manipulate magnetization rapidly and reliably. Several methods can control magnetization, such as by applying current pulses or magnetic fields. An applied current can reverse magnetization with nanosecond speed through the spin torque effect. For faster switching, subpicosecond switching with femtoseconds laser pulse has been achieved in amorphous rare-earth transition-metal ferrimagnets. In this study, we employed atomistic simulations to investigate ultrafast switching in a synthetic antiferromagnet with bilayer amorphous Fe...
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A groundbreaking technique produces tetrataenite, a material used in permanent magnets only found in meteorites. source：advancedsciencenewsPermanent magnets are widely used in industry, playing a particularly important role in power generators and motors. The best magnets are made of rare-earth metals, but as their name suggests, these elements are not ubiquitous in nature.Moreover, mining them is not environmentally friendly, and there are also concerns over the security of the rare-earth supply chain, prompting researchers to look for alternatives. The most popular, so far, is an alloy ...
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2022
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