薄膜中铁的亚稳结构及其异常磁化行为

It is a importance topic for material and condensed matter physical scientist to exlore the origin of the magnetization of the magnetic materials. In this project, the e-beam vapor deposition technique was used for preparing the metastable iron phases, i.e., fcc, rhombohedral and amorphous Fe. The forming conditions of various metastable Fe phases was obtained in the experiment. The magnetic properties of various metastable Fe phase was investigated by VSM. The experimental results indicated that the magnetic properties was related to the nature of the constituent metals in the multilayers, the crystal structure and the its lattice parameter. that the by ion beam assisted deposition. The magnetic moment of the fcc and amorphous Fe increased with increasing the distance between Fe and Fe atoms. The magnetic bebavior and electronic and magnetic structures of the rhombohedral fe were calculated by the first-principles all-electron linearized augmented plane-wave method within the local spin-density functional approximation. This study provides some new data to explore the origin of the magnetization of the magnetic materials, and provide some scientific basis for developing the new magnetic materials. We have published 11 SCI papers.

磁性多层膜以其独特的结构和性能成为多学科关注的焦点之一。过去的研究多集中于研究其垂直磁化、巨磁阻效应等。本项目拟用电子束蒸镀技术制备具有不同亚稳结构的铁相，研究其形成条件和规律，分析所获得的亚稳结构铁的磁化行为，研究铁原子磁矩与结构的关系，建立理论模型，为研究物质的磁性起源提供数据，为发展新型磁性材料提供理论依据。.