Temperature Dependence of Coercivity Behavior in Fe Films on Fractal Rough Ceramics Surfaces
Temperature Dependence of Coercivity Behavior in Fe Films on Fractal Rough Ceramics Surfaces
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DOI：
10.7567/jjap.52.01ac13
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发表时间：
2013
影响因子：
1.5
通讯作者：
Miaogen Chen;Z. Jiao;Senjiang Yu;Ming-xun Yu;F. Bao;Keiji Nakamura
中科院分区：
文献类型：
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作者：
Miaogen Chen;Z. Jiao;Senjiang Yu;Ming-xun Yu;F. Bao;Keiji Nakamura
在本文中，我们研究了分形粗糙 α-Al2O3 陶瓷表面 Fe 薄膜的反常磁性能。发现Fe薄膜矫顽力Hc的温度依赖性在临界温度Tcrit = 10 K附近呈现出峰值：首先，Hc随着温度T的增加而增加；然后随着 T 进一步增加，它迅速减小。矫顽力的峰值随着膜厚度的减小而升高。据估计，对于 T Tcrit，观察到的矫顽力行为主要受单畴颗粒或磁簇的不均匀尺寸分布的影响。研究表明，Fe 薄膜的 Hc 增强与分形陶瓷表面引起的薄膜表面粗糙度密切相关。热剩磁和振动样品磁力计测量进一步证实了该结果。
In this paper we study the anomalous magnetic properties in Fe films on fractal rough α-Al2O3 ceramics surfaces. It is found that the temperature dependence of the coercivity Hc of the Fe films exhibits a peak around a critical temperature Tcrit = 10 K: firstly, Hc increases with the temperature T; then it decreases rapidly as T further increases. The peak of the coercivity goes up with the decrease of the film thickness. It is estimated that, for T Tcrit, the observed coercivity behavior is mainly dominated by the effect of the non-uniform size distribution of the single-domain particles or magnetic clusters. The study shows that the enhancement Hc of the Fe films is strong related to the roughness of the film surfaces induced by the fractal ceramics surfaces. The results are further confirmed by the thermoremanence and vibrating sample magnetometer measurements.