Spin regulation in composite spin-filter barrier devices

Guo-Xing Miao, Joonyeon Chang, Badih A. Assaf, Donald Heiman and Jagadeesh S. Moodera ()
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Guo-Xing Miao: Francis Bitter Magnet Lab, Massachusetts Institute of Technology
Joonyeon Chang: Francis Bitter Magnet Lab, Massachusetts Institute of Technology
Badih A. Assaf: Northeastern University
Donald Heiman: Northeastern University
Jagadeesh S. Moodera: Francis Bitter Magnet Lab, Massachusetts Institute of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Magnetic insulators are known to provide large effective Zeeman fields that are confined at an interface, making them especially powerful in modifying adjacent one- or two-dimensional electronic structures. Utilizing this phenomenon and the other important property of magnetic insulators—spin filtering—here we report the generation and subsequent detection of a large interface field, as large as tens of tesla in EuS/Al/EuS heterostructures with metallic coulomb islands confined within a magnetic insulator barrier. The unique energy profile across this sandwich structure produces spin-assisted charge transfer across the device, generating a spontaneous spin current and voltage. These unique properties can be practical for controlling spin flows in electronic devices and for energy harvesting.

Date: 2014
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DOI: 10.1038/ncomms4682

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