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Insights in Magnetodynamics from a Simple Two-Level Model

preprint
submitted on 05.05.2020 and posted on 07.05.2020 by Stanislav Avdoshenko, Rajyavardhan Ray
With single-molecule magnets research on the rise as a result of recent advantages in the field, like remarkable high blocking temperatures up to 60 Kelvin [Nature, 548, 439, 2017], gigantic coercivity up to 80 Tesla [Nat Commun., 10, 571, 2019], magnetization stability in the thin films, further applications are seriously in the scope. The possible venue here is to develop a theory of magnetic moment manipulation and control at the microscopic level. Theory of optimal control in quantum dynamics in complex systems is well-developed. For example, the uses of density matrix techniques have been well summarized already in the early ‘60s by Fano, Haar, and many others. Thus, in many respects, the task is to reframe that research into the language of the problem at hand, and into familiar terms for the community. Recently, it was already proven the Redfield reduced density matrix techniques are applicable for slow-relaxing single-molecule magnets [Nat Commun., 8, 14620, 2017]. In our recent contribution[PCCP,20, 11656, 2018], we have outlined the use of Lindblad dynamics in combination with a few axioms in the rationalization of the relaxation behavior of single-molecule magnets. In this report we put this approach in the context of the magentodynamics theory, showing the close connection to the Landau-Lifshitz-Gilbert model and presenting further elaboration for the proposed method.

Funding

Marie Skłodowska-Curie actions, EU project SamSD (grant agreement number 748635).

European Union (ERDF) and the Free State of Saxony via the ESF project 100231947 and 100339533

Young Investigators Group Computer Simulations for Materials Design – CoSiMa

History

Email Address of Submitting Author

s.avdoshenko@gmail.com

Institution

IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

Country

Germany

ORCID For Submitting Author

0000-0001-5839-3079

Declaration of Conflict of Interest

no conflict of interest

Version Notes

current version 1.01

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