| Popis: |
Although the conventional magnetic material theory has been developed for more than 110 years since the molecular field assumption was proposed by Weiss, the explanation of material magnetic property is still challenging due to (i) conflicting views regarding the Mn and Cr cation distributions in (A)[B]2O4 spinel ferrites; (ii) the failure to explain dependence of the magnetic moments observed in R1−xTxMnO3 perovskite manganites on doped divalent cation ratio x; (iii) the failure to describe the relationship between the average ionic magnetic moments and electrical resistivities of Fe, Co, and Ni; (iv) no consistent model exists that explains the magnetic ordering in both oxides and metals. In this chapter, we briefly introduce these difficulties faced by the conventional magnetic ordering models. |
