Abstract
Two small-particle maghemite (λ-Fe2O3) samples have been investigated with the Mössbauer effect. From the results of the model-independent hyperfine-field distribution fits some characteristic temperature-dependent parameters have been obtained. The spectra at the lowest temperatures could be fitted with two strongly overlapping hyperfine-field distributions with different isomer shifts. Spectra in applied magnetic fields ranging from 40 to 60 kOe, and at 4.2 K showed non vanishing Δm 1=0 absorption lines. The hyperfine-field distribution and canting-angle distribution method for fitting these spectra did not yield reasonable results. Therefore, a bi-dimensional hyperfine-field-canting-angle distribution has been applied, and was found to reproduce the experimental line shapes with remarkable adequacy. The resulting distribution profiles revealed a linear correlation between Hhf and the angle between the magnetic moments and the external field.
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References
A.E. Berkowitz, W.J. Schuele and P.J. Flanders, J. Appl. Phys. 39 (1968) 1261.
K. Haneda and A.H. Morrish, Phys. Lett. 64A (1977) 259.
P.J. Picone, K. Haneda and A.H. Morrish, J. Phys. C: Solid State Phys. 15 (1982) 317.
J.M.D. Coey and D. Khalafalla. Phys. Status Solidi (a) 11 (1972) 229.
S. Mørup and H. Topsøe, Appl. Phys. 11 (1976) 63.
S. Mørup, J. Magn. Magn. Mater. 37 (1983) 39.
A.H. Morrish, K. Haneda and P.J. Schurer, J. Phys. Colloq. 37 (1976) C6–301.
E. Tronc and D. Bonnin, J. Phys. Lett. 46 (1985) L437.
P. Levitz, D. Bonnin, G. Calas and A.P. Legrand, J. Phys. E: Sci. Instrum. 13 (1980) 427.
K. Haneda and A.H. Morrish, Solid State Commun. 22 (1977) 779.
T. Yang, A. Krishnan, N. Benczer-Koller and G. Bayreuther, Phys. Rev. Lett. 48 (1982) 1292.
C. Wivel and S. Mørup, J. Phys. E: Sci. Instrum. 14 (1981) 605.
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Senior Research Associate at the National Fund for Scientific Research, Belgium.
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de Bakker, P.M.A., De Grave, E., Vandenberghe, R.E. et al. Mössbauer study of small-particle maghemite. Hyperfine Interact 54, 493–498 (1990). https://doi.org/10.1007/BF02396078
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DOI: https://doi.org/10.1007/BF02396078