Static Parameters of Domain Structures in Iron Garnet Films

A. A. Rusinov

and E. A. Rusinova

Ural Federal University, Yekaterinburg, Russia

Ural State University of Railway Transport USURT, Yekaterinburg, Russia

Keywords: Dynamic domain structures, leading center, static parameters.

Abstract: This article is devoted to the study of the static parameters of domain structures found in garnet ferrite films

(Balbashov, 1976; Kandaurova, 1990; Kandaurova, 1999). In the works (Rusinov, 2014; Rusinov, 2015),

the effect of alternating and constant magnetic fields on structures of this kind has already been considered

in detail. The mechanisms of formation and destruction of structures, as well as the processes of formation

of DDS on artificial and natural defects, are considered. The experimentally obtained results allowed us to

conclude that such formations are very sensitive to changes in magnetic fields, which allows them to be

used in the creation of non-destructive testing devices, for example, to control the quality of a railway track.

1 INTRODUCTION

Dynamic domain structures called Leading centers

are formed on point defects in thin epitaxial films of

iron garnets. Experimental studies have shown that

for the formation of this type of structures, a

necessary condition is the presence of a defect. Both

natural and artificial defects were present on the

studied samples. The origin of the defect has

practically no effect on the behavior of the ECs; with

changes in the parameters of the magnetic fields, the

ECs behave identically (

Rusinov, 2018; Rusinov, 2020;

Kandaurova, 2005; Kryuchkova, 2021; Rusinov, 2021).

Examples of such structures are shown in Fig.1.

Figure 1: Dynamic Structures, Small and Large Leading

Centers.

Figure 1 clearly shows that the EC is a system of

concentric rings, the center of which is located on

the defect. With a change in the amplitude and fre-

quency of the magnetic field, the number of rings of

the Small and Large ECs changes significantly. The

experiment showed that such structures exist only in

a certain range of frequencies and amplitudes of the

magnetic field. A detailed study of the areas of ex-

istence of VCs made it possible to determine the

boundaries of the destruction and formation of these

structures. Figure 2 shows the regions of existence

of Leading centers for different f and H. It can be

noted that with an increase in the frequency of the

alternating field, the regions shift towards lower

amplitudes and decrease in size.

Figure 2: Areas of VC existence at different frequencies of

an alternating magnetic field.

The process of formation is accompanied by a

gradual increase in the number of rings of the Lead-

ing center, and the process of destruction by a de-

crease in the number of ring domains until the struc-

ture completely disappears. Figure 3 shows the de-

pendences of the number of VC rings on various

defects, depending on the amplitude and frequency

of the alternating field.

344

Rusinova, E. and Rusinov, A.

Static Parameters of Domain Structures in Iron Garnet Films.

DOI: 10.5220/0011586900003527

In Proceedings of the 1st International Scientiﬁc and Practical Conference on Transport: Logistics, Construction, Maintenance, Management (TLC2M 2022), pages 344-346

ISBN: 978-989-758-606-4

 2023 by SCITEPRESS – Science and Technology Publications, Lda. Under CC license (CC BY-NC-ND 4.0)

Figure 3а: Dependence of the number of VC rings on H,

on an artificial defect.

Figure 3b: Dependence of the number of VC rings on H,

on an artificial defect.

Figure 4a: Dependence of the number of VC rings on H,

on a natural defect.

Figure 4b. Dependence of the number of VC rings on H,

on a natural defect.

It is clearly seen that the maximum number of

rings in Fig. 3a and 3b are larger than in Figs. 4a and

4b, it can also be noted that VCs with a large num-

ber of rings are more stable and exist in an equilibri-

um state for a longer time. It should be noted that as

the pump field amplitude increases, the structures on

different defects behave almost identically. A con-

stant field has a destructive effect on the CC, but the

greater the number of ring domains, the more stable

the CC.

The period of nucleation of EC rings was deter-

mined for various amplitudes of an alternating mag-

netic field and a fixed frequency. The average period

and frequency of the birth of ring domains has been

calculated. The resulting dependence can be seen in

Fig.3. With an increase in the amplitude H, the aver-

age period monotonically decreases, and the fre-

quency of formation of new rings increases with an

increase in the amplitude H.

Figure 5: Dependence of the period of birth of ring do-

mains on the amplitude of the alternating magnetic field.

2 FINDINGS

Studies of domain structures "Leading Center" have

shown that alternating and constant magnetic fields

affect the origin, destruction and existence of DDS

data. Domain structures in the form of ring domains

are formed on defects. Graphs of the dependence of

the number of rings on the amplitude of the alternat-

ing magnetic field are plotted, it can be seen from

the graphs that the region of stable existence of the

VC depends on the number of rings, the larger the

number of rings, the longer the DS exists in a stable

state. The average period of the nucleation of the CC

and its dependence on the amplitude of the alternat-

ing magnetic field are calculated.

REFERENCES

Balbashov, A. M., Chervonenkis, A. Ya., 1979. Magnetic

materials for microelectronics. Energiya.

Static Parameters of Domain Structures in Iron Garnet Films

345

Kandaurova, G. S., Svidersky, A. E., 1990. Letters to

ZhETF. 97(4). pp. 1218-1229.

Kandaurova, G. S., Osadchenko, V. Kh., Rusinov, A. A.,

Rusinova, E. A., 1999. Letters to ZhETF. 63(6). pp.

453-456.

Rusinov, A. A., Rusinova, E. A., 2014. Bulletin of the

Ural State University of Railways. 2 (22). pp. 19-27.

Rusinov, A. A., Rusinova, E. A., 2015. Bulletin of the

Ural State Transport University. 1 (25). pp. 18-23.

Rusinov, A. A., Rusinova, E. A., Avksentyeva, E. I., 2018.

Bulletin of modern research. 12. 1 (27). pp. 401-402.

Rusinov, A. A., Rusinova, E. A., 2020. International

independent scientific journal. 21(2). pp. 61-63.

Kandaurova, G. S., Osadchenko, V. Kh., Pashko, A. G.,

2005. Physics of the Solid State.

Kryuchkova, D. S., Rusinova, E. A., 2021. «Influence of

Magnetic Field on Dynamic Parameters of Domain

Structures of the "Leading Center" Type,» in Theory,

School and Concepts of Sustainable Development of

Science in Modern Conditions. Collection of articles

on the results of the International Scientific and

Practical Conference. Sterlitamak. pp. 5-12.

Rusinov, A. A., Rusinova, E. A., 2021. Evolution and

parameters of dynamic domain structures of the

"Leading Center" type. AIP Conference

Proceedings. "Proceedings of the Scientific

Conference on Railway Transport and Engineering,

RTE 2021". 090008.

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