期刊
PHYSICAL REVIEW B
卷 82, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.113403
关键词
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资金
- ONR [N00014-04-1-0413, N00014-08-1-0915, N00014-07-1-0825]
- NSF [DMR-0701558, DMR-0080054]
- DOE [DE-SC0002220]
- MRI [0722625]
- U.S. Department of Energy (DOE) [DE-SC0002220] Funding Source: U.S. Department of Energy (DOE)
An effective Hamiltonian scheme is developed to investigate structural and magnetic properties of BiFeO3 nanodots under short-circuit-like electrical boundary conditions. Various striking effects are discovered. Examples include (a) scaling laws involving the inverse of the dots' size for the magnetic and electric transition temperatures; (b) the washing out of some structural phases present in the bulk via size effects; (c) the possibility of tailoring the difference between the Neel and Curie temperatures, by playing with the size and electrical boundary conditions; and (d) an universal critical thickness of the order of 1.6 nm below which the dots do not possess any long-range ordering for the electrical and magnetic dipoles, as well as, for the oxygen octahedral tiltings.
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