Light-induced magnetization reversal of high-anisotropy TbCo alloy films

Abstract : Magnetization reversal using circularly polarized light provides a way to control magnetization without any external magnetic field and has the potential to revolutionize magnetic data storage. However, in order to reach ultra-high density data storage, high anisotropy media providing thermal stability are needed. Here, we evidence all-optical magnetization switching for different TbxCo1−x ferrimagnetic alloy compositions using fs- and ps-laser pulses and demonstrate all-optical switching for films with anisotropy fields reaching 6 T corresponding to anisotropy constants of 3 × 106 ergs/cm3. Optical magnetization switching is observed only for alloy compositions where the compensation temperature can be reached through sample heating.
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Sabine Alebrand, Matthias Gottwald, Michel Hehn, Daniel Steil, Mirko Cinchetti, et al.. Light-induced magnetization reversal of high-anisotropy TbCo alloy films. Applied Physics Letters, American Institute of Physics, 2012, 101 (16), pp.162408. ⟨10.1063/1.4759109⟩. ⟨hal-02085985⟩

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