Moment canting in amorphous FeSiB ribbons in applied fields: unpolarized Mossbauer effect studies
| Autor: | G A Gehring, Quentin A. Pankhurst, Jianzhong Jiang, M.R.J. Gibbs, S. Betteridge |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Journal of Physics: Condensed Matter. 7:9571-9593 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/7/49/020 |
| Popis: | 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 field annealed Fe78Si9B13 metallic glass ribbons. Probability distributions for the Fe moment directions were deduced from unpolarized 57Fe 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 +or-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 +or-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. |
| Databáze: | OpenAIRE |
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