Continuous control of spin polarization using a magnetic field

J. A. Gifford, G. J. Zhao, B. C. Li, Brian D. Tracy, J. Zhang, D. R. Kim, David Smith, Tingyong Chen

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The giant magnetoresistance (GMR) of a point contact between a Co/Cu multilayer and a superconductor tip varies for different bias voltage. Direct measurement of spin polarization by Andreev reflection spectroscopy reveals that the GMR change is due to a change in spin polarization. This work demonstrates that the GMR structure can be utilized as a spin source and that the spin polarization can be continuously controlled by using an external magnetic field.

Original languageEnglish (US)
Article number212401
JournalApplied Physics Letters
Issue number21
StatePublished - May 23 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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