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Title: DAFS study of site-specific local structure of Mn in manganese ferrite films.

Abstract

Manganese ferrite (MnFe{sub 2}O{sub 4}) is a well-known magnetic material widely used in electronics for many years. It is well established that its magnetic behavior is strongly influenced by local structural properties of Mn ions, which are distributed between crystallographically inequivalent tetrahedral and octahedral sites in the unit cell. In order to understand and be able to tune properties of these structures, it is necessary to have detailed site-specific structural information on the system. Here we report on the application of diffraction-anomalous fine structure (DAFS) spectroscopy to resolve site-specific Mn local structures in manganese ferrite films. The DAFS measurements were done at undulator beamline 4-ID-D of the Advanced Photon Source at Argonne National Laboratory. The DAFS spectra (Fig. 1) were measured at several Bragg reflections in the vicinity of the Mn absorption K-edge, having probed separately contributions from tetrahedrally and octahedrally coordinated Mn sites. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around different inequivalent Mn sites in the unit cell. The reliability of the data treatment was checked carefully, and it was showed that the site-specific structural parameters obtained with DAFS allow us to describe fluorescence EXAFS spectrummore » measured independently. Fig. 2 shows individual site contributions to the imaginary part of the resonant scattering amplitude obtained from the treatment of the data of Fig. 1. The analysis of the refined site-specific absorption spectra was done using EXAFS methods based on theoretical standards. We provided direct evidence for the tetrahedral Mn-O bond distance being increased relative to the corresponding Fe-O distance in bulk manganese ferrites. The first coordination shell number was found to be reduced significantly for Mn atoms at these sites. This finding is consistent with the well-known tendency of Mn to be tetrahedrally coordinated in these compounds.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); USDOD; USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
971933
Report Number(s):
ANL/XSD/CP-119111
TRN: US1001423
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 5th International Conference on Synchrotron Radiation in Materials Science (SRMS 5); Jul. 30, 2006 - Aug. 2, 2006; Chicago, IL
Country of Publication:
United States
Language:
ENGLISH
Subject:
43 PARTICLE ACCELERATORS; ABSORPTION; ABSORPTION SPECTRA; ADVANCED PHOTON SOURCE; ALGORITHMS; ATOMS; BRAGG REFLECTION; DATA ANALYSIS; FERRITE; FERRITES; FINE STRUCTURE; FLUORESCENCE; MAGNETIC MATERIALS; MANGANESE; RELIABILITY; SCATTERING AMPLITUDES; SPECTRA; SPECTROSCOPY; SYNCHROTRON RADIATION; WIGGLER MAGNETS

Citation Formats

Kravtsov, E., Haskel, D., Cady, A., Yang, A., Vittoria, C., Zuo, X., Harris, V. G., X-Ray Science Division, Inst. of Metal Physics, Northeastern Univ., and Nankai Univ. DAFS study of site-specific local structure of Mn in manganese ferrite films.. United States: N. p., 2006. Web.
Kravtsov, E., Haskel, D., Cady, A., Yang, A., Vittoria, C., Zuo, X., Harris, V. G., X-Ray Science Division, Inst. of Metal Physics, Northeastern Univ., & Nankai Univ. DAFS study of site-specific local structure of Mn in manganese ferrite films.. United States.
Kravtsov, E., Haskel, D., Cady, A., Yang, A., Vittoria, C., Zuo, X., Harris, V. G., X-Ray Science Division, Inst. of Metal Physics, Northeastern Univ., and Nankai Univ. Sun . "DAFS study of site-specific local structure of Mn in manganese ferrite films.". United States. doi:.
@article{osti_971933,
title = {DAFS study of site-specific local structure of Mn in manganese ferrite films.},
author = {Kravtsov, E. and Haskel, D. and Cady, A. and Yang, A. and Vittoria, C. and Zuo, X. and Harris, V. G. and X-Ray Science Division and Inst. of Metal Physics and Northeastern Univ. and Nankai Univ.},
abstractNote = {Manganese ferrite (MnFe{sub 2}O{sub 4}) is a well-known magnetic material widely used in electronics for many years. It is well established that its magnetic behavior is strongly influenced by local structural properties of Mn ions, which are distributed between crystallographically inequivalent tetrahedral and octahedral sites in the unit cell. In order to understand and be able to tune properties of these structures, it is necessary to have detailed site-specific structural information on the system. Here we report on the application of diffraction-anomalous fine structure (DAFS) spectroscopy to resolve site-specific Mn local structures in manganese ferrite films. The DAFS measurements were done at undulator beamline 4-ID-D of the Advanced Photon Source at Argonne National Laboratory. The DAFS spectra (Fig. 1) were measured at several Bragg reflections in the vicinity of the Mn absorption K-edge, having probed separately contributions from tetrahedrally and octahedrally coordinated Mn sites. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around different inequivalent Mn sites in the unit cell. The reliability of the data treatment was checked carefully, and it was showed that the site-specific structural parameters obtained with DAFS allow us to describe fluorescence EXAFS spectrum measured independently. Fig. 2 shows individual site contributions to the imaginary part of the resonant scattering amplitude obtained from the treatment of the data of Fig. 1. The analysis of the refined site-specific absorption spectra was done using EXAFS methods based on theoretical standards. We provided direct evidence for the tetrahedral Mn-O bond distance being increased relative to the corresponding Fe-O distance in bulk manganese ferrites. The first coordination shell number was found to be reduced significantly for Mn atoms at these sites. This finding is consistent with the well-known tendency of Mn to be tetrahedrally coordinated in these compounds.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

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  • No abstract prepared.
  • Diffraction anomalous fine structure (DAFS) spectroscopy has been applied to resolve site-specific Mn local structure in manganese ferrite films grown under nonequilibrium conditions. The DAFS spectra were measured at a number of Bragg reflections in the vicinity of the Mn absorption K edge. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around crystallographically inequivalent Mn sites in the unit cell with nominal octahedral and tetrahedral coordination. The strong preference for Mn to be tetrahedrally coordinated in this compound is not only manifested in the relative site occupancies but alsomore » in a strong reduction in coordination number for Mn ions at nominal octahedral sites.« less
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