Magnetic susceptibility of HCP iron and seismic anisotropy of the Earth’s core
The seismic anisotropy of the Earth was proposed to be due to a preferred orientation of HCP iron crystals that constitutes the dominating element in the core. The suggested mechanism involves the anisotropy of the magnetic susceptibility χ of HCP iron, and it is argued that if χ is sufficiently ani...
Збережено в:
| Дата: | 2003 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Донецький фізико-технічний інститут ім. О.О. Галкіна НАН України
2003
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| Назва видання: | Физика и техника высоких давлений |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/167954 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Magnetic susceptibility of HCP iron and seismic anisotropy of the Earth’s core / G.E. Grechnev, R. Ahuja, O. Eriksson // Физика и техника высоких давлений. — 2003. — Т. 13, № 1. — С. 14-18. — Бібліогр.: 19 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | The seismic anisotropy of the Earth was proposed to be due to a preferred orientation of HCP iron crystals that constitutes the dominating element in the core. The suggested mechanism involves the anisotropy of the magnetic susceptibility χ of HCP iron, and it is argued that if χ is sufficiently anisotropic, a preferential orientation of the HCP crystals may occur. We have calculated ab initio χ and the anisotropy energy of HCP iron for pressures and temperatures corresponding to the Earth's inner core conditions. Our calculations demonstrate that χ is smaller when the field is along the c-axis of HCP iron. Hence, a toroidal magnetic field is shown to orient HCP Fe with c-axis along the north–south direction, and combined with the data on elastic constants this explains the seismic anisotropy. |
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