Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.037207
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Funding
- NSF [DMR-1066158, DMR-0701558]
- Department of Energy, Office of Basic Energy Sciences [ER-46612]
- ARO [W911NF-12-1-0085]
- ONR [N00014-11-1-0384, N00014-08-1-0915, N00014-07-1-0825]
- National Natural Science Foundation of China [10904122]
- MICINN-Spain [MAT2010-18113, CSD2007-00041]
- MRI from NSF [0722625]
- Department of Defense
- Division Of Computer and Network Systems
- Direct For Computer & Info Scie & Enginr [0959124] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1066158] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [0918970] Funding Source: National Science Foundation
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An effective Hamiltonian is developed to investigate the magnetic cycloid of the BiFeO3 (BFO) multiferroic. This approach reproduces many complex features of this cycloid, such as its plane of rotation containing the polarization and the newly discovered spin density waves resulting from the canting of magnetic dipoles out of this cycloidal plane. It also suggests that the energetic origin of the cycloid can be thought of in terms of the converse spin-current model, and reveals the mechanisms responsible for the spin density waves. Finally, this atomistic scheme resolves an ongoing controversy about the cycloid anharmonicity, and revisits a recent misconception about the relationship between out-of-plane spin-density waves and the weak magnetization associated with the spin-canted structure of BFO.
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