Revisiting the mechanism of reversed thermoremanent magnetization based on observations from synthetic ferrian ilmenite (y = 0.7)
Revisiting the mechanism of reversed thermoremanent magnetization based on observations from synthetic ferrian ilmenite (y = 0.7)
复制标题
根据合成铁钛铁矿的观察重新审视反向热剩磁机制 (y = 0.7)
DOI：
10.1029/2004jb003076
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发表时间：
2004
影响因子：
--
通讯作者：
B. Moskowitz
中科院分区：
文献类型：
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作者：
Subir K. Banerjee;B. Moskowitz
[1]本文研究了三种合成的单相铁钛铁矿（y = 0.7）样品在10 K ~ 573 K温度范围内的磁行为。仔细的实验测量在可变的温度下，施加的磁场，和预处理条件下的诱导和reversible磁化进行，以阐明导致反向热reversible磁化（RTRM）的机制。磁有序的阳离子有序域的温度，在所有三个样品中，估计在380 K，这表明它们的居里温度（TC）是独立的样品的热历史。这不是由高温淬火引起的阳离子无序边界的情况。这些阳离子无序域的磁有序温度估计为418 K（Q1300），410 K（Q1050），和425 K（Q900）。这些数据明确支持一个不太完美的亚铁磁-反铁磁交换相互作用的RTRM的基本来源。此外，在这样的多晶样品中的有效交换各向异性的磁场强度估计为2.7mT（Q1300）、2.12mT（Q1050）和0 mT（Q900）。然而，从本文中提出的结果，我们得出结论，有利的条件，为收购RTRM不仅取决于交换各向异性的强度，但也对阳离子有序域的大小所发挥的关键作用。
[1] This study investigates the magnetic behavior of three well-characterized synthetic single-phase ferrian ilmenite (y = 0.7) specimens over the temperature range between 10 K and 573 K. Careful experiments measuring induced and remanent magnetizations in variable temperatures, applied magnetic fields, and pretreatment conditions are conducted in order to elucidate the mechanism leading to reversed thermoremanent magnetization (RTRM). Magnetic ordering temperatures of the cation ordered domains, in all three samples, are estimated at 380 K, suggesting that their Curie temperatures (T C ) are independent of the sample's thermal history. This is not the case for cation disordered boundaries resulting from quenching from high temperatures. These cation disordered domains have estimated magnetic ordering temperatures of 418 K (Q1300), 410 K (Q1050), and 425 K (Q900). The data unambiguously support a less than perfect ferrimagnetic-antiferromagnetic exchange interaction as the fundamental source of RTRM. Furthermore, the magnetic field strength of the effective exchange anisotropies in such polycrystalline samples are estimated at ∼2.7 mT (Q1300), ∼12 mT (Q1050), and 0 mT (Q900). However, from the results presented herein we conclude that favorable conditions for the acquisition of RTRM are dependent not only on the strength of the exchange anisotropy but also on the crucial role played by the size of the cation ordered domains.