Terahertz spectroscopy of spin waves in multiferroic BiFeO3 in high magnetic

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.110.257201· OSTI ID:1087042

Nagel, U. ^[1]; Fishman, Randy Scott ^[2]; Katuwal, T. ^[1]; Engelkamp, H. ^[3]; Talbayev, D. ^[4]; Yi, Hee Tack ^[5]; Cheong, Sang-Wook ^[5]; Room, T. ^[1]

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1. National Institute of Chemical Physics and Biophysics, Estonia
2. ORNL
3. Radboud University Nijmegen, The Netherlands
4. Tulane University
5. Rutgers University

We have studied the magnetic eld dependence of far-infrared active magnetic modes in a single ferroelectric domain BiFeO3 crystal at low temperature. The modes soften close to the critical eld of 18.8T along the [001] (pseudocubic) axis, where the cycloidal structure changes to the homogeneous canted antiferromagnetic state and a new strong mode with linear eld dependence appears that persists at least up to 31 T. A microscopic model that includes two Dzyaloshinskii-Moriya interactions and easy-axis anisotropy describes closely both the zero-eld spectroscopic modes as well as their splitting and evolution in a magnetic eld. The good agreement of theory with experiment suggests that the proposed model provides the foundation for future technological applications of this multiferroic material.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1087042
• Journal Information: Physical Review Letters, Vol. 110, Issue 25; ISSN 0031--9007
• Country of Publication: United States
• Language: English