Site-Selective Determination of Magnetic Helices in BaTiCoFe10O19 by Resonant Magnetic Scattering

Synchrotron radiation intensity measurements were made for single crystals of ferrimagnetic BaTiCoFe10O19 at the BL-6C(3A) beamline of the Photon Factory. The resonant x-ray magnetic scattering (RXMS) method at the Fe K edge makes it possible to determine the magnetic crystal structure, having the m...

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Bibliographic Details
Published in:Proceedings of the 10th International Conference 2009-10, Vol.1234, p.871-874
Main Authors: Okube, Maki, Kaneko, Yuhei, Ohsawa, Seiji, Toyoda, Takeshi, Mori, Takeharu, Sasaki, Satoshi
Format: Article
Language:English
Subjects:
Asymmetry
Crystal structure
Dichroism
Dispersion (wave)
Factories
Ferrimagnetism
Filing
Helices
Industrial engineering
Iron
Least squares method
Magnetic moment
Magnetic structure
Manufacturing engineering
Orientation
Photons
Plants
Polarization
Scattering
Single crystals
Synchrotron radiation
X-rays
Yttrium
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Summary:Synchrotron radiation intensity measurements were made for single crystals of ferrimagnetic BaTiCoFe10O19 at the BL-6C(3A) beamline of the Photon Factory. The resonant x-ray magnetic scattering (RXMS) method at the Fe K edge makes it possible to determine the magnetic crystal structure, having the magnetic helices for Fe ions in tetrahedral 4f1, bipyramidal 2b, and octahedral 2a, 4f2 and 12k sites. Based on the information on x-ray magnetic circular dichroism (XMCD) and a resonant magnetic scattering factor f'(m) (= 0.23) estimated from BaFe12O19 at E = 7128.2 eV, the magnetic structures have been determined from an asymmetrical ratio Delta R = (Y(+) - Y(-))/(F(+) + Y(-)), where Y+ and Y- are scattering intensities for left- and right-circular polarizations, respectively. Spin orientations were estimated in the least-squares procedure to minimize a residual factor of capital sigma ( Delta R(obs) - Delta R(calc))2. The canting angles estimated in this study are 180 degree , 19 degree , 118 degree , 180 degree and 65 degree for the magnetic moments of Fe ions in 4f1, 2b, 2a, 4f2 and 12k sites, respectively.
ISSN:0094-243X