Effects of the magnetic field on the relaxation of small particle systems
Effects of the magnetic field on the relaxation of small particle systems
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DOI：
10.1016/s0927-0256(02)00337-3
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发表时间：
2002-05
影响因子：
3.3
通讯作者：
Ò. Iglesias;A. Labarta
中科院分区：
文献类型：
--
作者：
Ò. Iglesias;A. Labarta
研究了磁场对具有各向异性常数分布和随机易轴方向的非相互作用单畴小粒子热弛豫的影响。在两态近似的框架下，数值计算了不同分布宽度、不同磁场H和温度T下的弛豫曲线。我们展示了如何得到的数据可以分析的修改Tln（t/τ0）标度的平均弛豫能垒的场依赖性，可以提取，这是不容易通过其他方法获得的微观信息。
We study the effect of a magnetic field on the thermal relaxation of non-interacting small monodomain particles with a distribution of anisotropy constants and random easy-axes directions. Numerical calculations of the relaxation curves for different distribution widths, and under different magnetic fields H and temperatures T, have been performed in the framework of a two-state approximation. We show how the obtained data can be analyzed in terms of an modified Tln(t/τ0) scaling from which the field dependence of the mean relaxing energy barriers can be extracted, a microscopic information which is not easily obtainable by other methods.