Giant gigahertz optical activity in multiferroic ferroborate

In contrast to the well-studied multiferroic manganites with a spiral structure, the electric polarization in multiferroic borates is induced within a collinear antiferromagnetic structure and can easily be switched by small static fields. Because of specific symmetry conditions, the static and dyna...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-05, Vol.89 (17), Article 174407
Hauptverfasser: Kuzmenko, A. M., Shuvaev, A., Dziom, V., Pimenov, Anna, Schiebl, M., Mukhin, A. A., Ivanov, V. Yu, Bezmaternykh, L. N., Pimenov, A.
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Sprache:eng
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Zusammenfassung:In contrast to the well-studied multiferroic manganites with a spiral structure, the electric polarization in multiferroic borates is induced within a collinear antiferromagnetic structure and can easily be switched by small static fields. Because of specific symmetry conditions, the static and dynamic properties in borates are directly connected, which leads to giant magnetoelectric and magnetodielectric effects. Here we prove experimentally that the giant magnetodielectric effect in samarium ferroborate, SmFe sub(3) (Bo sub(3)) sub(4), is of intrinsic origin and is caused by an unusually large electromagnon situated in the microwave range. This electromagnon reveals a strong optical activity exceeding 120 degrees of polarization rotation in a millimeter thick sample.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.89.174407