Ultrafast X-ray study reveals why magnons in an antiferromagnet persist for nanoseconds
Researchers from the Paul Scherrer Institute, EPFL, the University of Bremen, the University of Fribourg, Nantes Université and CNRS, the European Synchrotron (ESRF) and ETH Zurich have mapped how energy flows between electrons, spins and the crystal lattice in an antiferromagnet after it is hit by a laser pulse. They found that the magnons (collective spin excitations) survive far longer than expected before handing their energy to the lattice.
The team studied copper oxide (CuO), a well-known antiferromagnet with strong coupling between its magnetism and its lattice. An ultrashort optical laser pulse excited the electrons, which disordered the spins almost instantly and generated magnons across the whole momentum space within femtoseconds. Over the following picoseconds, the magnons scattered off each other and settled into a quasi-thermal state. Only after nanoseconds, about three orders of magnitude later, did they transfer their energy to the lattice as phonons (quantized lattice vibrations).
Source: https://www.spintronics-info.com/ultrafast-x-ray-study-reveals-why-magnons-antiferromagnet-persist-nanoseconds
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