Spin-Polarization in Quasi-Magnetic Tunnel Junctions

• 来源期刊: 中国物理快报（英文版）
• 关键词: @@
• 年，卷（期）: 2017,（5）
• 页码范围: 115-118
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/34/5/057502

摘要

Spin polarization in ferromagnetic metal/insulator/spin-filter barrier/nonmagnetic metal,referred to as quasimagnetic tunnel junctions,is studied within the free-electron model.Our results show that large positive or negative spin-polarization can be obtained at high bias in quasi-magnetic tunnel junctions,and within large bias variation regions,the degree of spin-polarization can be linearly tuned by bias.These linear variation regions of spin-polarization with bias are influenced by the barrier thicknesses,barrier heights and molecular fields in the spin-filter (SF) layer.Among them,the variations of thickness and heights of the insulating and SF barrier layers have influence on the value of spin-polarization and the linear variation regions of spin-polarization with bias.However,the variations of moIecular field in the SF layer only have influence on the values of the spin-polarization and the influences on the linear variation regions of spin-polarization with bias are slight.