Origin of self-reversed thermoremanent magnetization
The ability of certain magnetic minerals to acquire a remanent magnetization that opposes the direction of the Earth's magnetic field has fascinated rock magnetists since its discovery in 1951. Here, we determine the origin of this phenomenon, which is termed self-reversed thermoremanent magnet...
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| Veröffentlicht in: | Physical review letters 2005-12, Vol.95 (26), p.268501.1-268501.4, Article 268501 |
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| container_end_page | 268501.4 |
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| container_issue | 26 |
| container_start_page | 268501.1 |
| container_title | Physical review letters |
| container_volume | 95 |
| creator | HARRISON, Richard J KASAMA, Takeshi WHITE, Thomas A SIMPSON, Edward T DUNIN-BORKOWSKI, Rafal E |
| description | The ability of certain magnetic minerals to acquire a remanent magnetization that opposes the direction of the Earth's magnetic field has fascinated rock magnetists since its discovery in 1951. Here, we determine the origin of this phenomenon, which is termed self-reversed thermoremanent magnetization (SR-TRM). We present direct transmission electron microscopy observations of negative exchange coupling across antiphase domain boundaries (APBs) in ilmenite-hematite. This coupling is linked intrinsically to the origin of SR-TRM and is responsible for the formation of two new classes of magnetic domain wall at APBs. We present simulations of the chemical and magnetic structure of the APBs and show that SR-TRM is generated by coupling between strongly ferrimagnetic Ti-rich domains and weakly ferrimagnetic Fe-rich domains, which form during the transition from short- to long-range cation order. |
| doi_str_mv | 10.1103/PhysRevLett.95.268501 |
| format | Article |
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| issn | 0031-9007 1079-7114 |
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| source | MEDLINE; American Physical Society Journals |
| subjects | Computer Simulation Earth sciences Earth, ocean, space Exact sciences and technology Geophysics: general, magnetic, electric and thermic methods and properties Internal geophysics Magnetics Minerals - chemistry Models, Chemical |
| title | Origin of self-reversed thermoremanent magnetization |
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