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Issue 12, 2024
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1999

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Reviews of topical problems


On the relative contributions of precessional and longitudinal oscillations to the dynamics of magnets

 a,  b,  b,  c
a Chelyabinsk State University, ul. Bratev Kashirinykh 129, Chelyabinsk, 454021, Russian Federation
b A.A. Galkin Donetsk Physical-Technical Institute, ul. R. Lyuksemburg 72, Donetsk, 340114, Ukraine
c Kotelnikov Institute of Radioengineering and Electronics of the Russian Academy of Sciences, ul. Mokhovaya 11, kor. 7, Moscow, 125009, Russian Federation

Experimental studies of the high-frequency and acoustic properties of weak ferromagnets are reviewed and a theory that includes all possible mechanisms of the formation of magnet dynamics is presented. The dynamic properties of a magnet are shown to be generally determined by the precessional and longitudinal motions of magnetization and by their interaction with the elastic, paramagnetic, and dipole subsystems. It was found that the precessional and longitudinal contributions always coexist and are additive and that their relative magnitudes depend on both external factors and the relationship (which is characteristic of each specific magnet) between the temperatures of the spontaneous reorientation and ordering of the corresponding spin subsystem. Special attention is paid to the investigation of magnets near the reorientation phase transitions, where the effects due to changes in this relationship, as well as those caused by the interaction of various vibrational subsystems, are most pronounced.

Fulltext pdf (622 KB)
Fulltext is also available at DOI: 10.1070/PU1999v042n10ABEH000476
PACS: 75.10.−b, 75.30.−m, 75.50.−y (all)
DOI: 10.1070/PU1999v042n10ABEH000476
URL: https://ufn.ru/en/articles/1999/10/a/
000083688700001
Citation: Buchel’nikov V D, Dan’shin N K, Tsymbal L T, Shavrov V G "On the relative contributions of precessional and longitudinal oscillations to the dynamics of magnets" Phys. Usp. 42 957–990 (1999)
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Оригинал: Бучельников В Д, Даньшин Н К, Цымбал Л Т, Шавров В Г «Соотношение вкладов прецессионных и продольных колебаний в динамике магнетиков» УФН 169 1049–1084 (1999); DOI: 10.3367/UFNr.0169.199910a.1049

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