Researchers report non-thermal ultrafast spin switching in a canted antiferromagnet
Researchers from Kyoto University, Chiba University, The University of Tokyo, Osaka University and Tokai University have found that the direction of spins inside a special type of magnet can be changed rapidly – flipping about every trillionth of a second – without increasing the temperature. They achieved this by applying a strong magnetic field with an oscillation frequency in the terahertz range.
The background for this work, according to the scientists, is the ever-increasing amount of information handled by computers and communication devices, that is driving development of technologies using the terahertz band – around 1012 Hz, a frequency range beyond the conventional gigahertz range of 109 Hz – considered important for the post-5G era. Additionally, memory technologies based on spintronics are expected to use less power to store more information, with antiferromagnets attracting attention because their collective spin-motion mode frequency reaches the terahertz range, making it possible to control spins using terahertz waves. However, conventional spin excitation using electric-field pulses is accompanied by heating or carrier excitation effects that subside relatively slowly, making it difficult to achieve fast spin control. The team has now demonstrated non-thermal spin switching in a canted antiferromagnet by dynamically modifying the magnetic energy landscape using a strong multicycle terahertz magnetic near-field.
Source: http://www.spintronics-info.com/researchers-report-non-thermal-ultrafast-spin-switching-canted-antiferromagnet
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