TY - GEN
T1 - Site-selective determination of magnetic helices in BaTiCoFe 10O19 by resonant magnetic scattering
AU - Okube, Maki
AU - Kaneko, Yuhei
AU - Ohsawa, Seiji
AU - Toyoda, Takeshi
AU - Mori, Takeharu
AU - Sasaki, Satoshi
PY - 2010
Y1 - 2010
N2 - 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 BaFe 12O19 at E=7128.2eV, the magnetic structures have been determined from an asymmetrical ratio ΔR=(Y+-Y -)/(Y++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 Σ(ΔR obs-ΔRcalc)2. The canting angles estimated in this study are 180°, 19°, 118°, 180° and 65° for the magnetic moments of Fe ions in 4f1, 2b, 2a, 4f2 and 12k sites, respectively.
AB - 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 BaFe 12O19 at E=7128.2eV, the magnetic structures have been determined from an asymmetrical ratio ΔR=(Y+-Y -)/(Y++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 Σ(ΔR obs-ΔRcalc)2. The canting angles estimated in this study are 180°, 19°, 118°, 180° and 65° for the magnetic moments of Fe ions in 4f1, 2b, 2a, 4f2 and 12k sites, respectively.
KW - BaTiCoFeO
KW - magnetic helices
KW - magnetic structure determination
KW - resonant x-ray magnetic scattering
UR - http://www.scopus.com/inward/record.url?scp=77955027197&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955027197&partnerID=8YFLogxK
U2 - 10.1063/1.3463353
DO - 10.1063/1.3463353
M3 - Conference contribution
AN - SCOPUS:77955027197
SN - 9780735407824
T3 - AIP Conference Proceedings
SP - 871
EP - 874
BT - SRI 2009 - The 10th International Conference on Synchrotron Radiation Instrumentation
T2 - 10th International Conference on Synchrotron Radiation Instrumentation, SRI 2009
Y2 - 27 September 2009 through 2 October 2009
ER -