期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 22, 期 12, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GC010094
关键词
hematite; Morin transition; remanence; magnetism
资金
- Australian Research Council (ARC) [FS1001000076]
- Center for Advanced Marine Core Research (CMCR), Kochi University [19B014]
Hematite is a commonly occurring magnetic mineral with unique magnetic properties, exhibiting oscillating remanence states after thermal cycling, likely due to sublattice magnetization alignment switches. These observations provide new insights into the magnetism of hematite.
Hematite is a commonly occurring magnetic mineral in nature that has numerous scientific and technological applications. A characteristic property of hematite is a low-temperature spin-flop transition called the Morin transition. Above the transition temperature, hematite is a canted antiferromagnet that can carry a remanent magnetization. Below this transition, spin canting disappears and hematite becomes a true antiferromagnet although a small defect moment is usually preserved. We observe Morin transition behavior in natural samples that has not been reported before for hematite. During repeated thermal cycling of a remanent magnetization acquired at room temperature, the remanence intensity at the end of the cycle oscillates between a high remanence state at the end of odd-numbered cycles and a low remanence state (LRS) at the end of even-numbered cycles. Alternation of the high and LRSs during repeated thermal cycling points to hysteretic behavior of the spin-flop process, likely due to sublattice magnetization alignment switches along different easy magnetization axes in samples with preferred crystallographic orientations of hematite particles. We report these observations to seek to expand explanations of the magnetism of hematite.
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