摘要
本文根据Nd_2Fe_(14)B化合物中存有少量巡游电子的基本实验事实,提出了在 Nd_2Fe_(14)B中配位子所产生的晶场和巡游电子所产生的电场共同造成了Nd离子磁晶各向异性的理论模型。提出并解决了计算巡游电子同中心Nd离子相互作用的理论方法。在同时考虑Nd离子所受配位子的晶场和巡游电子的电场的作用情况下,用单离子模型计算了Nd_2Fe_(14)B中Nd离子所产生的磁晶各向异性及其随温度的变化。所得的K_1-T,K_7-T关系与实验符合得很好。这一结果还同时解释了这种材料在低温下所存在的自旋重取向现象。因此可以认为,这一模型基本上揭示了Nd_2Fe_(14)B中Nd离子磁晶各向异性的起源。
Based on the fact of the existance of a small amount itinerant electrons, a new theoretical model giving rise to magneto-crystalline anisotropy in compound Nd2Fe14B is presented in this paper. It is proposed that a combined effect on Nd-ion coming from both the crystal field of ligands and the electric field of itinerant electrons results in the anisotropy in the compound. An approach of calculating the interaction between itinerant electrons and central Nd-ion is given. The magneto-crystalline anisotropy of Nd-ion and its temperature dependences are calculated based on the model. The results are in good agreement with the experiments, and also give explanation to the spin reorientation phenomenon in the compound.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第7期1179-1185,共7页
Acta Physica Sinica
基金
中国科学院物理研究所磁学开放研究实验室基金
