Abstract

The dependence of the temperatures of magnetic phase transformations in porous ferromagnetic materials on the geometric characteristics (volume and shape) of pores and their distribution in a particular material has been studied. The geometric features of nanopores have been characterized by their effective pore radius and form factor (deviation of the pore shape from spherical). Estimations indicate that it is possible to obtain macroscopic samples of porous materials with decreased Curie temperatures, which can be further reduced in the case of complicated shapes of pores. These results were obtained in the framework of a cohesive model in application to pure porous nickel and cobalt.

中文翻译：

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多孔材料中居里温度的变化

摘要

研究了多孔铁磁材料中磁性相变温度对孔的几何特征（体积和形状）及其在特定材料中的分布的依赖性。纳米孔的几何特征已通过其有效孔半径和形状因数（孔形状与球形的偏离）来表征。估计表明，有可能获得居里温度降低的多孔材料的宏观样品，如果孔的形状复杂，则可以进一步减少。这些结果是在应用于纯多孔镍和钴的内聚模型框架内获得的。