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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2022
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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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source:.lpi.usraMeteorites and asteroids fascinate planetary scientists because they represent the building blocks of the planets and offer unique insights into the earliest moments of our solar system. Meteorites can be identified as such due to unique chemical signatures, and some types (iron meteorites) show beautiful textures called Widmanstätten patterns, which could only form over millions of years. Moreover, these extraterrestrial materials are important for their potential as in-situ resources for space exploration and industrialization, with the most attention given to water (imp...
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2022
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source:theswaddleLast month, two teams of scientists — from USA’s Northwestern University and UK’s Cambridge University — came up with methods to synthesize a material that doesn’t exist on Earth. The scientists devised their own methods to create tetrataenite — a complex iron and nickel alloy present exclusively in meteorites landing from outer space. In the long run, this development holds the potential to revolutionize green energy.A vital component of building renewable energy options is permanent magnets. Magnets and magnetic materials’ ability to generate electricity provides a cleaner, ...
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2022
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