Spin-polarized transport through a magnetic heterostructure: Tunneling and spin filtering effect

Jun Qiang Lu, Yong Guo, Feng Zhai, Bing Lin Gu, Jing Zhi Yu, Yoshiyuki Kawazoe

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We present tight-binding Green's function investigations on spin-polarized transport through a magnetic heterostructure system, which is made of two superlatticed magnetic layers separated by a nonmagnetic low-density-carrier spacer. The results confirm that in such a system, tunneling is one of the key mechanisms in electron transport. When tunneling effect is taken into account, the magnetoresistance ratios are reduced significantly. We also study the influence of the applied bias on the spin filtering effect. It is found that the current density is almost completely spin-polarized in a wide range of the applied bias, which indicates the heterostructure system can act as a good spin filter.

Original languageEnglish
Article number11651
Pages (from-to)616-621
Number of pages6
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume299
Issue number5-6
DOIs
Publication statusPublished - 2002

Keywords

  • Giant magnetoresistance
  • Magnetic heterostructure
  • Spin filter
  • Spin-polarized transport
  • Tunneling

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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