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摘要翻译：
通过有效各向异性模型，考虑表面各向异性的影响，计算了球形磁性纳米团簇的弛豫速率和随温度变化的开关场曲线。特别地，表面各向异性可以改变热激活磁化反转超过一个数量级，温度相关的开关场曲线明显偏离Stoner-Wohlfarth天体。考虑到最近和未来的$\mu$-SQUID测量，我们指出如何将我们的结果与孤立团簇的实验数据进行比较，可以获得关于表面各向异性的有价值的信息。
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英文标题：
《Thermal and surface anisotropy effects on the magnetization reversal of
a nanocluster》
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作者：
P.-M. Dejardin, H. Kachkachi, and Yu. P. Kalmykov
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最新提交年份：
2008
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分类信息：
一级分类：Physics 物理学
二级分类：Materials Science 材料科学
分类描述：Techniques, synthesis, characterization, structure. Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术，合成，表征，结构。结构相变，力学性质，声子。缺陷，吸附质，界面
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
The relaxation rate and temperature-dependent switching field curve of a spherical magnetic nanocluster are calculated by taking into account the effect of surface anisotropy via an effective anisotropy model. In particular, it is shown that surface anisotropy may change the thermally activated magnetization reversal by more than an order of magnitude, and that temperature-dependent switching field curves noticeably deviate from the Stoner-Wohlfarth astroid. With recent and future $\mu$-SQUID measurements in mind, we indicate how comparison of our results with experimental data on isolated clusters may allow one to obtain valuable information on surface anisotropy.
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PDF链接：
https://arxiv.org/pdf/712.1305
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