期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 321, 期 17, 页码 2563-2565出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.03.049
关键词
Spin filter tunneling; Magnetic tunnel junctions; Spin-dependent tunneling; Spin filter
资金
- National Science Foundation
- US Department of the Army trough USAMRMC [W81XWH-071-0708]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0820880] Funding Source: National Science Foundation
Spin filter tunneling is considered in the low bias limit as functions of the temperature dependent barrier parameters. We demonstrate the generation of spin polarized tunneling currents in relation to the magnetic order parameter, and discuss how an interfacially suppressed order parameter leads to a temperature dependent tunneling current asymmetry. Analyzing the full parameter space reveals that the often overlooked barrier thickness plays a critical role in spin filter tunneling. With all else fixed, thicker barriers yield higher spin polarization, and allow a given polarization to be achieved at higher temperatures. This insight may open the door for new materials to serve as spin filter barriers. (C) 2009 Elsevier B. V. All rights reserved.
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