Theoretical Analysis of Inertia-like Switching in Magnets: Applications to a Synthetic Antiferromagnet

Theoretical Analysis of Inertia-like Switching in Magnets : Applications to a Synthetic Antiferromagnet

Hellsvik, Johan (author): Uppsala universitet,Institutionen för fysik och astronomi

(creator_code:org_t)

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

The magnetization dynamics of a synthetic antiferromagnet subjected to a short-magnetic-field pulse has been studied by using a combination of first principles calculations and atomistic spin-dynamics simulations. We observe switching phenomena on the time scale of tens of picoseconds, and inertia-like behavior in the magnetization dynamics. We explain the latter in terms of a dynamic redistribution of magnetic energy from the applied-field pulse to other possible energy terms, such as the exchange interaction and the magnetic anisotropy, without invoking concepts such as the inertia of an antiferro-magnetic vector. We also demonstrate that such dynamics can also be observed in a ferromagnetic material where the incident-field pulse pumps energy to the magnetic anisotropy.

By the author/editor: Bhattacharjee, S ...; Bergman, Anders; Taroni, Andrea; Hellsvik, Johan; Sanyal, Biplab; Eriksson, Olle

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