Spin regulation in composite spin-filter barrier devices.
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.
1] Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Institute for Quantum Computing and Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L3G1.
Guo-Xing
GX
Miao
1] Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Spin Convergence Research Center, Korea Institute of Science and Technology, Seoul 136-791, South Korea.
Joonyeon
J
Chang
Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
Badih A
BA
Assaf
Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
Donald
D
Heiman
1] Francis Bitter Magnet Lab, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Physics Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Jagadeesh S
JS
Moodera