AC susceptibility of a magnetite crystal
AC susceptibility of a magnetite crystal
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DOI：
10.1016/s0304-8853(98)00863-4
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发表时间：
1999-05
影响因子：
2.7
通讯作者：
V. Skumryev;H. Blythe;J. Cullen;J. Coey
中科院分区：
文献类型：
--
作者：
V. Skumryev;H. Blythe;J. Cullen;J. Coey
在4.2~300 K温度范围内，研究了沿着a [1 1 0]方向外加磁场时Fe 3 O 4晶体的交流磁化率。在130 K时，χ ′有一个尖峰，χ ″有一个最小值，此时K1的符号发生变化;在Verwey转变时，χ ′有一个急剧的下降，χ ″有一个最大值;在50 K以下，χ ′随频率进一步下降，同时χ ″有一个峰值。低温行为与活化弛豫过程相关，τ 0 = 6 × 10 − 9s，Ea = 0.04 eV，这是由于耦合的电子跳跃和畴壁运动。
The AC susceptibility of an Fe3O4crystal has been studied from 4.2 to 300 K with field applied along a [1 1 0] direction. There is a sharp peak in χ′ and minimum in χ″ at 130 K where K1changes sign, a precipitous drop in χ′ and maximum in χ″ at the Verwey transition and a further, frequency-dependent decrease in χ′ accompanied by peak in χ″ below 50 K. The low-temperature behavior is associated with an activated relaxation process having τ0= 6 × 10−9s, Ea= 0.04 eV which is due to the coupled electron hopping and domain wall motion.