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Rasing, Ultrafast optical manipulation of magnetic order, Reviews of Modern Physics, 2010","review_link":"https://doi.org/10.1103/RevModPhys.82.2731","review_verified":"true","summary":"A laser pulse lasting less than a trillionth of a second can erase or even reverse a magnet's magnetization, and currents in heavy metals can twist nearby magnets through spin-orbit coupling (the link between an electron's motion and its spin). Where the angular momentum goes, and how these twisting forces arise, are still argued.","title":"Ultrafast magnetism and spin-orbit transport","topic_ref":null,"why":"These effects set the speed and energy limits of magnetic memory and 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