Dynamic pattern of skyrmions observed

phys.org | 8/23/2019 | Staff
AnnieFoxxAnnieFoxx (Posted by) Level 3
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Cu2OSeO3 is a material with unusual magnetic properties. Magnetic spin vortices known as skyrmions are formed within a certain temperature range when in the presence of a small external magnetic field. Currently, moderately low temperatures of around 60 Kelvin (-213 degrees Celsius) are required to stabilise their phase, but it appears possible to shift this temperature range to room temperature. The exciting thing about skyrmions is that they can be set in motion and controlled very easily, thus offering new opportunities to reduce the energy required for data processing.

Theoretical work had predicted that it should be possible to use a high-frequency electric field to excite a group of skyrmions in the sample so that their cores will rotate all together, synchronously like a fish swarm, clockwise or counter-clockwise, or alternatively they can even exhibit a "breathing" motion.

Team - Dynamics - Skyrmions - Detail - Time

Now a team has succeeded in measuring the dynamics of these skyrmions in detail for the first time using a single-crystal sample of Cu2OSeO3. "Conventional laboratory methods like ferromagnetic resonance, cannot detect directly deflection of the spins in the skyrmion phase and are therefore not suitable for observing selectively their excitations. Therefore, we had to come up with something new," explains Prof. Christian Back, from Technical University of Munich.

The team succeeded at BESSY II in combining a...
(Excerpt) Read more at: phys.org
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