Ferromagnetism and exchange bias in compressed ilmenite-hematite solid solution as a source of planetary magnetic anomalies.

ABSTRACT: We propose a compressed ilmenite-hematite solid solution as a new potential source of Earth's magnetic anomalies. The 0.5FeTiO₃·0.5Fe₂O₃ solid solution compressed by collision synthesis with super-high-energy ball milling showed a decrease in molar volume of approximately 1.8%. Consequently, the sample showed a saturation magnetization of 1.5 ampere square meter per kilogram (Am²/kg) at 300 kelvin, a Curie temperature of 990 kelvin, and a magnetic exchange bias below 100 kelvin, e.g., 1.7 × 10⁵ ampere per meter at 60 kelvin. Ilmenite-hematite solid solutions are common mineral systems in most mafic igneous and metamorphic rocks, and the compressive force in the rocks is generated by the high pressure in the upper mantle or by shock eve

SUBMITTER: Ohara S 

PROVIDER: S-EPMC8993106 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature