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While in accordance with Curie's principle, one would intuitively expect thatsymmetry of the cause has to be found in the symmetry of the effect, ultrafastexcitation of matter is able to violate this principle. For instance, it isbelieved that heating alone, obviously not having the symmetry of a magneticfield, cannot result in a deterministic reversal of magnetization. However, ifthe heating is induced by a femtosecond laser pulse and thus ultrafast, it doesfacilitate toggle switching of magnetization between stable bit-states withoutany magnetic field at all. Here we show that the regime of ultrafast toggleswitching beyond Curie's principle can be also realized via a mechanism withoutrelying on any heat. In particular, ultrafast laser excitation of iron-garnetwith linearly polarized light modifies magnetic anisotropy and thus causestoggling magnetization between two stable bit states. In contrast to thelaser-heat-induced magnetization reversal, this new regime of 'cold' toggleswitching can be observed in ferrimagnets without the compensation point and inan exceptionally broad temperature range. The control of magnetic anisotropyrequired for the toggle switching is accompanied by lower dissipations, than inthe mechanism of laser-induced-heating, but the dissipations and theswitching-time are shown to be competing parameters.

Ultrafast all-optical toggle writing of magnetic bits without relying on heat