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Tuesday, April 17 2018

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Localized magnetic configurations such as magnetic vortices and magnetic droplet solitons are great subjects for applications and fundamental understanding of spin dynamics since they can be controlled with external fields, electrical currents, and microwave excitations. Magnetic vortices are the ground state of certain micropatterned structures, whereas magnetic droplet solitons are created in an extended magnetic thin film by local excitation of spin waves. However, damping works against the formation of stable magnetic droplet solitons, and their stability is more challenging.

Thousands of planets beyond our own Solar system have been discovered in the last two decades and it is now clear that exoplanets are abundant in our neighborhood of the Milky Way. Despite this large sample, characterizing trends in the planet population is challenging. This is partly because the properties of their host stars are poorly constrained. In particular, the way planetary systems evolve over time is still unknown because stellar ages are notoriously difficult to measure. Did certain epochs of the Universe's history produce more exoplanets than others?