Theoretical and Numerical Modeling of Optical Switching of Epitaxial Nanostructures Based on Iron-Garnet Films

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Abstract

The paper presents a theoretical analysis of magnetization switching in a gadolinium ferrite garnet film due to the demagnetizing effect of a femtosecond laser pulse. Using the Lagrange formalism for a two-sublattice ferrimagnet, the effective Lagrangian, thermodynamic potential, and Rayleigh dissipative function are obtained. The phase diagram of the ferrite film is analyzed, and the main states of the system are identified. Magnetization switching diagrams and trajectories of the order parameter dynamics of the magnet are constructed. The ranges of magnetic fields, temperatures, and demagnetization values for the most efficient magnetization switching are analyzed.

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About the authors

V. V. Yurlov

MIREA – Russian Technological University; New Spintronic Technologies LLC; Moscow Institute of Physics and Technology

Author for correspondence.
Email: yurlov.vv@phystech.edu
Russian Federation, Moscow; Moscow; Dolgoprudny

K. A. Zvezdin

MIREA – Russian Technological University; New Spintronic Technologies LLC

Email: yurlov.vv@phystech.edu
Russian Federation, Moscow; Moscow

A. K. Zvezdin

MIREA – Russian Technological University; New Spintronic Technologies LLC; A.M. Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: yurlov.vv@phystech.edu
Russian Federation, Moscow; Moscow; Moscow

References

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Supplementary files

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2. Fig. 1. Phase H-T diagram of gadolinium ferrite garnet GdIG. The external magnetic field H is directed along the [001] axis of GdIG. Cπ and C0 represent the collinear phases of the ferrite, where θ = π and θ = 0. NC1 and NC2 represent the non-collinear phases corresponding to the polar angle ranges π / 2 < θ1 < π and π < θ2 < π / 2, respectively. TM ≈ 250 K is the compensation temperature. The inset shows an example of stable states of the system in non-collinear regions numbered 1 to 8, respectively. States (5, 6, 7, 8) belong to the C0 region; states (1, 2, 3, 4) belong to the Cπ region

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3. Fig. 2. a - H-T diagram of magnetisation switching at a fixed value of demagnetisation; each of the eight possible states is shown in colour; b, c - represent the trajectories of magnetisation dynamics for the corresponding points (b) and (c) in the diagram (red and yellow point, respectively), the green arrow represents the initial state, the red arrow - the final state

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4. Fig. 3. a - ∆m - H-diagram of magnetisation switching at a fixed temperature TM ≈ 250 K; each of the eight possible states is shown in colour; b, c - represent the trajectories of magnetisation dynamics for the corresponding points (b) and (c) in the diagram (red and yellow dot, respectively), the green arrow represents the initial state, the red arrow - the final state

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