Local Weak Ferromagnetism in Single-Crystalline Ferroelectric BiFeO3

M. Ramazanoglu; Mark Laver; W. Ratcliff; S.M. Watson; W.C. Chen; A. Jackson; K. Kothapalli; S. Lee; S.-W. Cheong; V. Kiryukhin

doi:10.1103/PhysRevLett.107.207206

Local Weak Ferromagnetism in Single-Crystalline Ferroelectric BiFeO3

M. Ramazanoglu, Mark Laver, W. Ratcliff, S.M. Watson, W.C. Chen, A. Jackson, K. Kothapalli, S. Lee, S.-W. Cheong, V. Kiryukhin

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Abstract

Polarized small-angle neutron scattering studies of single-crystalline multiferroic BiFeO3 reveal a long-wavelength spin density wave generated by ∼1° spin canting of the spins out of the rotation plane of the antiferromagnetic cycloidal order. This signifies weak ferromagnetism within mesoscopic regions of dimension 0.03 microns along [11̅ 0], to several microns along [111], confirming a long-standing theoretical prediction. The average local magnetization is 0.06 μB/Fe. Our results provide an indication of the intrinsic macroscopic magnetization to be expected in ferroelectric BiFeO3 thin films under strain, where the magnetic cycloid is suppressed.

Original language	English
Journal	Physical Review Letters
Volume	107
Issue number	20
Pages (from-to)	207206-1/207206-5
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.107.207206
Publication status	Published - 2011

Keywords

Bismuth ferrite
Physics
Multiferroic bifeo3
Thin-film heterostructures
Room-temperature

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title = "Local Weak Ferromagnetism in Single-Crystalline Ferroelectric BiFeO3",

abstract = "Polarized small-angle neutron scattering studies of single-crystalline multiferroic BiFeO3 reveal a long-wavelength spin density wave generated by ∼1° spin canting of the spins out of the rotation plane of the antiferromagnetic cycloidal order. This signifies weak ferromagnetism within mesoscopic regions of dimension 0.03 microns along [11̅ 0], to several microns along [111], confirming a long-standing theoretical prediction. The average local magnetization is 0.06 μB/Fe. Our results provide an indication of the intrinsic macroscopic magnetization to be expected in ferroelectric BiFeO3 thin films under strain, where the magnetic cycloid is suppressed.",

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AU - Ramazanoglu, M.

AU - Laver, Mark

AU - Ratcliff, W.

AU - Watson, S.M.

AU - Chen, W.C.

AU - Jackson, A.

AU - Kothapalli, K.

AU - Lee, S.

AU - Cheong, S.-W.

AU - Kiryukhin, V.

PY - 2011

Y1 - 2011

N2 - Polarized small-angle neutron scattering studies of single-crystalline multiferroic BiFeO3 reveal a long-wavelength spin density wave generated by ∼1° spin canting of the spins out of the rotation plane of the antiferromagnetic cycloidal order. This signifies weak ferromagnetism within mesoscopic regions of dimension 0.03 microns along [11̅ 0], to several microns along [111], confirming a long-standing theoretical prediction. The average local magnetization is 0.06 μB/Fe. Our results provide an indication of the intrinsic macroscopic magnetization to be expected in ferroelectric BiFeO3 thin films under strain, where the magnetic cycloid is suppressed.

AB - Polarized small-angle neutron scattering studies of single-crystalline multiferroic BiFeO3 reveal a long-wavelength spin density wave generated by ∼1° spin canting of the spins out of the rotation plane of the antiferromagnetic cycloidal order. This signifies weak ferromagnetism within mesoscopic regions of dimension 0.03 microns along [11̅ 0], to several microns along [111], confirming a long-standing theoretical prediction. The average local magnetization is 0.06 μB/Fe. Our results provide an indication of the intrinsic macroscopic magnetization to be expected in ferroelectric BiFeO3 thin films under strain, where the magnetic cycloid is suppressed.

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KW - Physics

KW - Multiferroic bifeo3

KW - Thin-film heterostructures

KW - Room-temperature

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DO - 10.1103/PhysRevLett.107.207206

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JO - Physical Review Letters

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Local Weak Ferromagnetism in Single-Crystalline Ferroelectric BiFeO3

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