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MOMENT CANTING IN AMORPHOUS FESIB RIBBONS IN APPLIED FIELDS - UNPOLARIZED MOSSBAUER-EFFECT STUDIES

PANKHURST, QA; JIANG, JZ; BETTERIDGE, S; GIBBS, MRJ; GEHRING, GA; (1995) MOMENT CANTING IN AMORPHOUS FESIB RIBBONS IN APPLIED FIELDS - UNPOLARIZED MOSSBAUER-EFFECT STUDIES. J PHYS-CONDENS MAT , 7 (49) 9571 - 9593.

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Abstract

The phenomenon of 'moment canting', where the atomic moments in a Soft magnetic material do not completely align with an applied field of substantial magnitude, has been measured as a function of field in held annealed Fe78Si9B13 metallic glass ribbons. Probability distributions for the Fe moment directions were deduced from unpolarized Fe-57 Mossbauer experiments. A method of analysis was devised to account for spectral saturation effects, and validated with reference to polycrystalline alpha-Fe. Fields of up to 0.5 T were applied at room temperature in the ribbon plane. Even in 0.5 T the in-plane moment canting did not fall to zero, with the standard deviation of the Gaussian spread in moment directions remaining at 12 degrees +/- 1 degrees. Fields of up to 9 T were applied at 4.2 K, normal to the ribbon plane. Even in 9 T appreciable canting was observed, with a Gaussian standard deviation of 11 degrees +/- 1 degrees with respect to the applied field direction. An a priori 'combed hair' model was developed to describe the moment canting that would result from the presence of a few frustrated exchange interactions between some magnetic atoms. Long-distance moment canting was predicted, with a truncated inverse sine probability distribution. The data were found to be adequately described using this model.

Type: Article
Title: MOMENT CANTING IN AMORPHOUS FESIB RIBBONS IN APPLIED FIELDS - UNPOLARIZED MOSSBAUER-EFFECT STUDIES
Keywords: MAGNETIC-PROPERTIES, GLASSY FERROMAGNET, METALLIC GLASSES, SPECTRA, FE78B13SI9, ALLOYS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/59462
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