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The magnetization dynamics of a synthetic antiferromagnet subject to a shortmagnetic field pulse, has been studied by using a combination offirst-principles and atomistic spin dynamics simulations. We observe switchingphenomena on the time scale of tens of picoseconds, and inertia-like behaviorin the magnetization dynamics. We explain the latter in terms of a dynamicredistribution of magnetic energy from the applied field pulse to otherpossible energy terms, such as the exchange interaction and the magneticanisotropy, without invoking concepts such as inertia of an antiferromagneticvector. We also demonstrate that such dynamics can also be observed in aferromagnetic material where the incident field pulse pumps energy to themagnetic anisotropy.

A theoretical analysis of inertia-like switching in magnets: applications to a synthetic antiferromagnet