2024-03-29T01:11:52Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/55782022-11-17T02:08:08Zhdl_2115_20053hdl_2115_145Proposal and analysis of a ferromagnetic triple-barrier resonant-tunneling spin filterUemura, T.Marukame, T.Yamamoto, M.540A novel spin filter consisting of a triple-barrier resonant tunneling system in the form F/I/N/I/F/I/F is proposed, where F, I, and N represent a ferromagnetic material, an insulator, and a nonmagnetic material, respectively. The spin-dependent tunneling current in the triple-barrier resonant tunneling system is calculated theoretically on the basis of a Tsu-Esaki formula to investigate the output tunnel current polarization. Detailed calculations using the GaMnAs/AlAs/GaAs material system show that the two clear split peaks originating from up- and down-spin holes appear in the current-voltage (I-V) curve due to spin splitting of the energy levels formed in the ferromagnetic quantum well. The polarization can reach more than 98% at the peak positions in the I-V curve.IEEEJournal Articleapplication/pdfhttp://hdl.handle.net/2115/5578https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/5578/1/ITM39-5.pdf0021-9606IEEE Transactions on Magnetics395280928112003-09enginfo:doi/10.1109/TMAG.2003.815719Copyright © 2003 American Institute of Physicspublisher