Spin regulation in composite spin-filter barrier devices
- Spin regulation in composite spin-filter barrier devices
- Guo-Xing Miao; 장준연; Badih A. Assaf; Donald Heiman; Jagadeesh S. Moodera
- spin filter; spin regulation; EuS; tunneling magnetoresistance; magnetic insulator
- Issue Date
- Nature Communications
- VOL 5, 3682-1-3682-6
- 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.
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