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X-Ray Magnetic Circular Dichroism Studies on CeNi_4B

100%
Toliński T., Cezar J., Wende H., Kowalczyk A., Baberschke K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
129-131
EN
The CeNi_4B compound is a mixed-valence system. It is a paramagnet with μ_{eff}= 0.52 μ_{B}/f.u. and the paramagnetic Curie temperature θ= -10.7 K. In the present research we complete our previous magnetic susceptibility and X-ray photoemission measurements with new studies by the X-ray magnetic circular dichroism method. The observation of the Ce M_{4,5} edges carried out with X-ray magnetic circular dichroism confirms the mixed-valence state deduced previously from X-ray photoemission spectroscopy. Moreover, we report on the measurements of the Ni L_{2,3} edges, which enable verification of the Ni contribution to the magnetism of this compound.
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Surface Magnetic Anisotropy of Epitaxial La_{0.7}Mn_{1.3}O_{2.84} Thin Films

73%
Aleshkevych P., Baran M., Dyakonov V., Szymczak R., Szymczak H., Baberschke K., Lindner J., Lenz K.
Acta Physica Polonica A
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2006
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vol. 110
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issue 1
57-70
EN
A spin-wave resonance technique was used to collect information on elementary magnon excitations in high quality epitaxial La_{0.7}Mn_{1.3}O_{2.84} films prepared by dc-magnetron sputtering. It was found that besides bulk spin-wave modes, the spin-wave resonance spectrum includes also the surface spin waves. The value of spin-wave stiffness constant D=156 meV·Å^2 was found. The values of the surface magnetic anisotropy on both surfaces and their angular dependence were determined. The experimentally found spin-wave resonance spectra were explained based on the surface-inhomogeneity model. The effect of surface anisotropy on the spin-wave excitation conditions in epitaxial La_{0.7}Mn_{1.3}O_{2.84} films was investigated. Spin-wave resonance data give an indirect evidence of periodic charge-ordered stripes formation.
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