SUPERFERROMAGNETISM IN GADOLINIUM FILMS
SUPERFERROMAGNETISM IN GADOLINIUM FILMS
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DOI：
10.1002/pssa.2210110117
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发表时间：
1972-01-01
影响因子：
2
通讯作者：
ROHKEL, K
中科院分区：
文献类型：
--
作者：
BOSTANJOGLO, O;ROHKEL, K
以Gd薄膜为例，研究了其超铁磁性。多晶薄膜被发现分裂成磁性团簇。在体居里点以下，它们是铁磁性的。由于它们之间的相互作用减弱，只有在临界温度Tcr<；Tc以下才能建立磁性长程有序。应用分子场和自旋波理论对相互作用的团簇进行研究，实验薄膜的磁化强度得到了很好的重现。对于晶体直径相差很大的薄膜，团簇直径、临界温度和薄膜磁化强度与温度的函数一致，团簇直径(≈︁9？)小于后者(15~80？)。在Gd的情况下，铁磁体的细分为团簇是由于氧化物的去耦合。
Superferromagnetism is investigated using Gd films as an example. Polycrystalline films were found to split into magnetic clusters. Below the bulk Curie pointTCthey are ferromagnetic. Due to weakened interactions between them magnetic long‐range order is established only below a critical temperatureTcr<TC.Applying molecular field and spin wave theory to interacting clusters the experimental film magnetization is fairly reproduced. Cluster diameter, critical temperature, and film magnetization as function of temperature coincide for films with widely different crystal diameters, the cluster diameter (≈︁ 9 Å) being smaller than the latter (15 to 80 Å). In the case of Gd the sub‐division of the ferromagnet into clusters is due to decoupling oxides.