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Scientists post a lower speed limit for magnetic switching

In the push toward ever-faster magnetic recording, experts expected to find a physical limit, a threshold speed beyond which materials would respond chaotically. “If you had asked me a year ago, ‘How fast does one have to create a pulse that does not switch magnetization?’ my answer would have been one femtosecond (one thousandth of a trillionth of a second),” said Jo Stöhr, Deputy Director of SSRL. “Chaotic behavior was not expected in this experiment, which ran in the picosecond (trillionth-of-a-second) range.”
Scientists post a lower speed limit for magnetic switching


magnetoreluctance, magnetism