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L.涅耳(Néel)在本世纪四十年代建立了亚铁磁性理论;在他的领导下在法国对磁性材料的研究形成了一个学派。这一学派对于希土元素铁氧体的研究可以认为是从1950年开始的,那时 H.福莱斯蒂(Forestier)与 G.居奥-居兰(Guiot-Guillain)最初关于RFeO_3(R 表示希士元素)型化合物的文章登载在法国科学院院报上。这些化合物的晶体结构,如果其组成与 RFeO_3式相当,系属于钙钛石型,但其中不少种有二个居里点出现,这一奇特的性质引起了人们的兴趣,但从结构与磁性的关系上讲,却不能用涅耳的理论很好地解释。从这一点出发,考虑到原料的纯度等因
L. Néel founded the ferrimagnetism theory in the 1940s; under his leadership a study of magnetic materials in France formed a school of thought. This school’s study of the rare earth ferrite can be thought of as beginning in the 1950s when Forestier and Guiot-Guillain initially described RFeO_3 (R The article, which represents the element of Heath, is published in the French Academy of Sciences. The crystal structure of these compounds, if their composition is similar to that of RFeO_3, belongs to the peridotite type, but many of them have two Curie points. This peculiar property has aroused people’s interest. However, its structure and magnetic properties , It can not be well explained by Ner’s theory. From this point of departure, taking into account the purity of raw materials and other factors