| Автор | O F Bakkaloglu |
| Автор | Q A Pankhurst |
| Автор | M F Thomas |
| Дата выпуска | 1993-05-10 |
| dc.description | Mossbauer spectra of three neutron-irradiated polycrystalline haematite ( alpha -Fe<sub>2</sub>O<sub>3</sub>) samples have been recorded at 4.2 K in applied fields of up to 10 T. Field-induced phase transitions were observed, and were found to differ markedly from those that occur in non-irradiated haematite. In two lightly irradiated samples, transitions were detected from a state with Fe<sup>3+</sup> spins near the (111) axis ('antiferromagnetic phase') to one where the spins are almost perpendicular to both the applied field and to the (111) axis ('weak ferromagnetic phase'). In the case of a heavily irradiated sample, in which the spins were initially in the weak ferromagnetic phase, the spins were observed to lie almost perpendicular to applied fields of greater than approximately 4.5 T. The difference in behaviour in irradiated and non-irradiated haematite is attributed to a smaller difference in anisotropy energy, in the irradiated samples, between the antiferromagnetic and weak ferromagnetic phases at 4.2 K. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Field-induced phase transitions in neutron-irradiated haematite |
| Тип | paper |
| DOI | 10.1088/0953-8984/5/19/022 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 5 |
| Первая страница | 3265 |
| Последняя страница | 3274 |
| Аффилиация | O F Bakkaloglu; Dept. of Phys., Liverpool Univ., UK |
| Аффилиация | Q A Pankhurst; Dept. of Phys., Liverpool Univ., UK |
| Аффилиация | M F Thomas; Dept. of Phys., Liverpool Univ., UK |
| Выпуск | 19 |
