On the domain structure of ferrite-garnet films with complex anisotropy under quasi-stationary magnetization reversal

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Abstract

We presented the results obtained in the experimental and theoretical analysis of quasi-stationary magnetization reversal of ferrite-garnet films with complex anisotropy. Using a magneto-optical setup based on the Faraday effect, the conditions under which it is possible to reduce the area of occurrence of the domain structure are revealed, and the presence of destruction of the state of homogeneous magnetization of the magnetic film in four narrow regions located relative to each other at right angles is also established. A theory that is in good agreement with the experimental results is proposed.

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About the authors

A. V. Matyunin

Lomonosov Moscow State University

Author for correspondence.
Email: physphak@mail.ru

Chair of General Physics, Faculty of Physics

Russian Federation, Moscow, 119991

G. M. Nikoladze

Lomonosov Moscow State University

Email: physphak@mail.ru

Chair of General Physics, Faculty of Physics

Russian Federation, Moscow, 119991

P. A. Polyakov

Lomonosov Moscow State University

Email: physphak@mail.ru

Chair of General Physics, Faculty of Physics

Russian Federation, Moscow, 119991

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Supplementary files

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2. Fig. 1. General view of the magneto-optical setup. 4 – switching unit, 5 – switching unit power supply (Mastech HY3003), 6 – additional switching unit power supply (Mastech HY3003), 7 – laptop, 8 – multimeter for monitoring the currents flowing in the coil circuits (Mastech M9803R), 9 – magnetometer (LIS3MDL), 10 – digital camera for recording the domain structure (Nikon D3400). In the inset: 1 – small coils, mainly used to saturate the film under study, 2 – large coils creating a remagnetizing field, 3 – small coils used to compensate for the Earth's field, and also creating the component of the magnetization vector necessary for observing the Faraday effect.

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3. Fig. 2. Images of the domain structure during quasi-stationary magnetization reversal of a ferrite-garnet film having both biaxial and uniaxial anisotropy in its plane. The images were obtained at the following values of the magnetization reversal field Hp: 12 Oe (a), 15 Oe (b). The magnetization reversal field is directed along one of the easy magnetization axes – parallel to the horizontal side of the frame from left to right.

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4. Fig. 3. Magneto-optical images of the magnetic structure of a ferrite-garnet film with different orientations of the magnetic field strength vector: domain structure in the absence of a magnetic field (a), the vector rotation angle is 45º (b), 57º (c), 147º (d), 234º (d), 326º (e).

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5. Fig. 4. Theoretical graph of the dependence of the angle β on the magnitude of the external magnetic field Hp and experimentally obtained values taking into account the measurement error.

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