Magnetic properties of bilayer film with antidote lattice: monte carlo modeling

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Abstract

The article simulates the magnetic properties of a bilayer film with an antidote lattice using the Monte Carlo method. The system consists of two films with different magnetic susceptibility (magnetosoft and magnetohard layers). The thickness of the magnetohard layer remains constant and the thickness of the magnetosoft layer varies. The antidote lattice is formed in the film. The antidote lattice is an array of square pores located at regular lattice nodes. The Ising model is used to describe the magnetic properties of the system. The film layers have different exchange constants in this model. The article studies the dependence of the Curie temperature for the system on the thickness of the soft magnetic layer and the period of the antidote lattice. The phase transition temperature depends non-linearly on both parameters. The second stage examines the process of magnetization. The antidote lattice and the magnetosoft layer distort the hysteresis loop. Dependence of coercive force and magnetization energy on system parameters is investigated.

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About the authors

S. V. Belim

Omsk State Technical University

Author for correspondence.
Email: sbelim@mail.ru
Russian Federation, Omsk

S. S. Simakova

Omsk State Technical University

Email: sbelim@mail.ru
Russian Federation, Omsk

I. V. Tikhomirov

Omsk State Technical University

Email: sbelim@mail.ru
Russian Federation, Omsk

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Supplementary files

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2. Fig. 1. Geometrical parameters of the system.

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3. Fig. 2. Binder cumulants for a bilayer film with layer thicknesses D1=8, D2=6 and antidot lattice period d=8: (a) for the entire bilayer film; (b) for the hard magnetic layer; (c) for the soft magnetic layer.

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4. Fig. 3. Dependence of the phase transition temperature TC of a bilayer film on the lattice period of antidots. The red dotted line shows the temperature of a continuous film without an antidot lattice.

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5. Fig. 4. Dependence of magnetic susceptibility on temperature both for the film layers and for the bilayer film as a whole. (MH is the susceptibility graph for the hard magnetic layer; MS is the susceptibility graph for the soft magnetic layer; BL is the susceptibility graph for the bilayer film.)

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6. Fig. 5. Hysteresis loops for films with different thicknesses of the soft magnetic layer D2 and the ratio of exchange integrals R: (a) R=0.4; (b) R=0.8.

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7. Fig. 6. Hysteresis loops for films with different thicknesses of the soft magnetic layer D2, ratios of exchange integrals R and lattice period of antidots d: (a) R=0.4, a=2, d=4; (b) R=0.4, a=2, d=8; (c) R=0.8, a=2, d=16; (d) R=0.8, a=2, d=16.

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8. Fig. 7. Dependence of the coercive force Hc on the ratio of the exchange integrals R for different thicknesses of the soft magnetic component D2 for a continuous film and a film with different lattice periods of antidots d: (a) continuous film; (b) d=16; (c) d=8; (d) d=4.

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9. Fig. 8. Dependence of the coercive force Hc on the ratio of exchange integrals R for films with a soft magnetic layer thickness D2=6 and different lattice periods of antidots d.

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10. Fig. 9. Dependence of the magnetization reversal energy Em on the ratio of exchange integrals R for different thicknesses of the soft magnetic component D2 for a continuous film and a film with different lattice periods of antidots d: (a) continuous film; (b) d=16; (c) d=8; (d) d=4.

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11. Fig. 10. Dependence of the magnetization reversal energy on the ratio of exchange integrals for D2=6 and different lattice periods of antidots.

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