Review of the low-temperature magnetic properties of magnetite from a rock magnetic perspective
Review of the low-temperature magnetic properties of magnetite from a rock magnetic perspective
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DOI：
10.1046/j.1365-246x.2000.00999.x
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发表时间：
2000-01-01
影响因子：
2.8
通讯作者：
McClelland, E
中科院分区：
文献类型：
--
作者：
Muxworthy, AR;McClelland, E
对磁铁矿的低温磁性进行了综述，并讨论了其对岩石磁性的意义。记录了磁铁矿在Verwey转变(T-v)附近低温下的基本性质的行为，并对各种Verwey转变理论给予了关注。对控制磁畴结构的磁能的低温行为进行了详细的综述。在岩石磁学文献中首次记载了低温自发磁化异常(M-S)，并讨论了饱和磁化强度与M-S在Verwey转变附近的区别。认为在低温循环过程中，磁晶各向异性的低温行为，特别是T-v处的异常，最有可能影响多磁畴剩磁。对于多磁区晶体，通过T-v冷却时，磁晶各向异性强度的大幅增加和对称性的降低可能会降低闭合磁区的稳定性。
The low-temperature magnetic properties of magnetite are reviewed, and implications for rock magnetism considered. The behaviour of fundamental properties of magnetite at low temperatures near the Verwey transition (T-v) are documented, and attention is given to various Verwey transition theories. The low-temperature behaviour of the magnetic energies that control domain structure is reviewed in detail. For the first time in rock magnetic literature, the low-temperature anomaly in spontaneous magnetization (M-s) is documented and the differences between the saturation magnetization and M-s near the Verwey transition are discussed. It is argued that the low-temperature behaviour of the magnetocrystalline anisotropy, and in particular the anomaly at T-v, is most likely to affect multidomain remanence during low-temperature cycling. For multidomain crystals it is calculated that the large increase in magnetocrystalline anisotropy intensity and reduction in symmetry on cooling through T-v is likely to reduce the stability of closure domains.