Journal of Radio Electronics. eISSN 1684-1719. 2023. ¹12
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DOI: https://doi.org/10.30898/1684-1719.2023.12.26

 

MODELING OF EXTERNAL INFLUENCE ON THE RESONANCE PROPERTIES OF BULK ANTIFERROMAGNET

Α − Fe2O3 DURING A SPIN-REORIENTATION TRANSITION

 

T.V. Bogdanova1,2, D.V. Kalyabin1,3, A.R. Safin1,3,4, S.A. Nikitov1,2,5

 

1Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 125009, Moscow, st. Mokhovaya, 11, bldg. 7

2Moscow Institute of Physics and Technology (National Research University), 141701, Dolgoprudny, Moscow region, Institutsky lane, 9, Dolgoprudny

3Higher School of Economics, 101000, Moscow, st. Myasnitskaya, 20

4National Research University «MPEI», 111250, Moscow, st. Krasnokazarmennaya, 14, building 1

5Saratov National Research State University, 410012, Saratov, st. Bolshaya Cossack, 112k8

 

The paper was received November 30, 2023

 

Abstract. This paper presents a model that explains the influence of external pressure on the resonant frequency of a bulk crystal a–Fe2O3 in an external magnetic field. The dynamics of vectors l and m before and after the Morin temperature TM are considered. The dependences of the resonant frequency on pressure and external magnetic field for the cases  H║(HA ║ z) and H┴(HA ║ z) are obtained, and the dependences of the magnetic field on pressure are obtained for the lower and upper modes. It was found that when external pressure is applied to the structure, the natural frequency of vibrations of the magnetic sublattices of the antiferromagnet increases significantly. The results obtained can be used in the development of devices for generating and processing signals in the gigahertz and terahertz frequency ranges.

Key words: terahertz radiation, spin-reorientation transition, antiferromagnet, pressure.

Financing: The work was carried out within the framework of the state assignment of the Kotelnikov Institute of Radio Engineering and Electronics Russian Academy of Sciences.

Corresponding author: Bogdanova Tatyana Vladimirovna, bogdanova.tv@phystech.edu

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For citation:

Bogdanova T.V., Kalyabin D.V., Safin A.R., Nikitov S.A. Modeling of external influence on the resonance properties of bulk antiferromagnet α − Fe2O3 during a spin-reorientation transition // Journal of Radio Electronics. – 2023. – ¹12. https//doi.org/10.30898/1684-1719.2023.12.26 (In Russian)