Exchange Interaction as a Cause of Reverse Thermo-Remanent Magnetism
Exchange Interaction as a Cause of Reverse Thermo-Remanent Magnetism
复制标题
交换相互作用是反向热剩磁的原因
作者：
T. Nagata;S. Uyeda
1952年，我们报道了日本Haruna山紫苏角闪岩英安岩浮石中所含铁磁矿物的自反转热回磁性的发生。产生这种特殊现象的物理机制最初被认为是Néel 2所假设的，即场冷却期间具有不同居里点（TcA和TcB）的两个铁磁相（A和B）之间的静磁相互作用。确定了铁磁矿物由两个不同的相组成，A为立方贫钛钛磁铁矿（TcA ~ 500° C）。Ba菱方体固溶体0.55FeTiO_3·0.45Fe_2O_3（TcB = 200° C）。3. A、B的丰度比A/B约为0.02。随后的研究表明，钛铁矿-铁闪锌矿相是唯一的成分负责我们的反向热磁;钛磁铁矿相，虽然更丰富，是无关的现象4。
WE reported, in 1952, the occurrence of self-reversing thermo-remanent magnetism of the ferromagnetic minerals contained in the hypersthene hornblende dacite pumice of Mount Haruna, Japan1. The physical mechanism producing this particular phenomenon was at first considered to be one postulated by Néel2, that is, a magneto-static interaction during field-cooling, between two ferromagnetic phases (A, andB) with different Curie points (TcA, andTcB). We ascertained that the ferromagnetic minerals consist of two distinct phases,Abeing a cubic titanium-poor titanomagnetite (TcA∼ 500° C.) andBa rhombohedral solid solution between ilmenite and hæmatite 0.55 FeTiO3.0.45 Fe2O3(TcB∼ 200° C.)3. The abundance ratio ofA, andBwas found to beA/Babout 0.02. Subsequent investigations have revealed that the ilmenite-hæmatite phase is the only constituent responsible for our reverse thermo-remanent magnetism; the titanomagnetite phase, although more abundant, is irrelevant to the phenomenon4.