Simulation of magnetization process and Faraday effect of magnetic bilayer films

doi:10.1088/1674-1056/ad5a76

Abstract We described ferromagnetic film and bilayer films composed of two ferromagnetic layers coupled through antiferromagnetic interfacial interaction by classical Heisenberg model and simulated their magnetization state, magnetic permeability, and Faraday effect at zero and finite temperature by using the Landau-Lifshitz-Gilbert (LLG) equation. The results indicate that in a microwave field with positive circular polarization, the ferromagnetic film has one resonance peak while the bilayer film has two resonance peaks. However, the resonance peak disappears in ferromagnetic film, and only one resonance peak emerges in bilayer film in the negative circularly polarized microwave field. When the microwave field's frequency exceeds the film's resonance frequency, the Faraday rotation angle of the ferromagnetic film is the greatest, and it decreases when the thickness of the two halves of the bilayer is reduced. When the microwave field's frequency remains constant, the Faraday rotation angle fluctuates with temperature in the same manner as spontaneous magnetization does. When a DC magnetic field is applied in the direction of the anisotropic axis of the film, the Faraday rotation angle varies with the DC magnetic field and shows a similar shape of the hysteresis loop.

Keywords: magnetic bilayer films magnetic permeability hysteresis loop Faraday effect Landau-Lifshitz-Gilbert(LLG) equation

Received: 11 March 2024
Revised: 18 June 2024
Accepted manuscript online: 21 June 2024

PACS:	75.70.Cn	(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
	75.75.-c	(Magnetic properties of nanostructures)
	78.20.Ls	(Magneto-optical effects)
	77.80.Dj	(Domain structure; hysteresis)

Fund: The research was funded by the Research Program of Shenyang Institute of Science and Technology (Grant No. ZD- 2024-05).

Corresponding Authors: An Du
E-mail: duan@mail.neu.edu.cn

Cite this article:

Sheng Gao(高升), An Du(杜安), Lei Zhang(张磊), Tian-Guang Li(李天广), and Da-Cheng Ma(马大成) Simulation of magnetization process and Faraday effect of magnetic bilayer films 2024 Chin. Phys. B 33 097505

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