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Terahertz spectroscopy of spin waves in multiferroic BiFeO₃ in high magnetic fields

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arxiv 1302.2491 v2 pith:NYW4UCFA submitted 2013-02-11 cond-mat.str-el cond-mat.mtrl-sci

Terahertz spectroscopy of spin waves in multiferroic BiFeO₃ in high magnetic fields

U. Nagel , Randy S. Fishman , T. Katuwal , H. Engelkamp , D. Talbayev , Hee Taek Yi , S.-W. Cheong , T. R\~o\~om This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords fieldmagneticmodesdependencemodelmultiferroicactiveagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have studied the magnetic field dependence of far-infrared active magnetic modes in a single ferroelectric domain \BFO/ crystal at low temperature. The modes soften close to the critical field of 18.8\,T along the [001] (pseudocubic) axis, where the cycloidal structure changes to the homogeneous canted antiferromagnetic state and a new strong mode with linear field dependence appears that persists at least up to 31\,T. A microscopic model that includes two \DM/ interactions and easy-axis anisotropy describes closely both the zero-field spectroscopic modes as well as their splitting and evolution in a magnetic field. The good agreement of theory with experiment suggests that the proposed model provides the foundation for future technological applications of this multiferroic material.

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