Bridging atomistic spin dynamics methods and phenomenological models of single-pulse ultrafast switching in ferrimagnets
| Autor: | Florian Jakobs, Unai Atxitia |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Physical Review B. 106 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.106.134414 |
| Popis: | We bridge an essential knowledge gap on the understanding of all-optical ultrafast switching in ferrimagnets, namely, the connection between atomistic spin dynamics methods and macroscopic phenomenological models. All-optical switching of the magnetization occurs after the application of a single femtosecond laser pulse to specific ferrimagnetic compounds. This strong excitation puts the involved degrees of freedom, electrons, lattice, and spins out-of-equilibrium between each other. Atomistic spin models have quantitatively described all-optical switching in a wide range of experimental conditions, while having failed to provide a simple picture of the switching process. Phenomenological models are able to qualitatively describe the dynamics of the switching process. However, a unified theoretical framework is missing that describes the element-specific spin dynamics as atomistic spin models with the simplicity of phenomenology. Here, we bridge this gap and present an element-specific macrospin dynamical model which fully agrees with atomistic spin dynamics simulations and symmetry considerations of the phenomenological models. |
| Databáze: | OpenAIRE |
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