Universal criteria for single femtosecond pulse ultrafast magnetization switching in ferrimagnets
arXiv:2201.09067 · doi:10.1103/PhysRevLett.129.037203
Abstract
Single-pulse switching has been experimentally demonstrated in ferrimagnetic GdFeCo and MnRuGa alloys. Complete understanding of single-pulse switching is missing due to the lack of an established theory accurately describing the transition to the non-equilibrium reversal path induced by femtosecond laser photo-excitation. In this work we present general macroscopic theory for the magnetization dynamics of ferrimagnetic materials upon femtosecond laser excitation. Our theory reproduces quantitatively all stages of the switching process observed in experiments. We directly compare our theory to computer simulations using atomistic spin dynamics methods for both GdFeCo and MnRuGa alloys. We provide explicit expressions for the magnetization relaxation rates in terms of microscopic parameters which allows us to propose universal criteria for switching in ferrimagnets.
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Cited by in corpus (4)
- Helicity-independent all-optical switching of magnetization in ferrimagnetic alloys
- Ultrafast single-pulse all-optical switching in synthetic ferrimagnetic Tb/Co/Gd multilayers
- Temperature dependence of spin-model parameters in antiferromagnets
- Gateway to all-optical spin switching in Heusler ferrimagnets: Pancharatnam-Berry tensor and magnetic moment ratio