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Appl. Sci. 2018, 8(8), 1348; https://doi.org/10.3390/app8081348

Interface Characterization of Current-Perpendicular-to-Plane Spin Valves Based on Spin Gapless Semiconductor Mn2CoAl

School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
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Received: 19 July 2018 / Revised: 8 August 2018 / Accepted: 9 August 2018 / Published: 10 August 2018
(This article belongs to the Special Issue Recent Advances in Novel Materials for Future Spintronics)
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Abstract

Employing the first-principles calculations within density functional theory (DFT) combined with the nonequilibrium Green’s function, we investigated the interfacial electronic, magnetic, and spin transport properties of Mn2CoAl/Ag/Mn2CoAl current-perpendicular-to-plane spin valves (CPP-SV). Due to the interface rehybridization, the magnetic moment of the interface atom gets enhanced. Further analysis on electronic structures reveals that owing to the interface states, the interface spin polarization is decreased. The largest interface spin polarization (ISP) of 78% belongs to the MnCoT-terminated interface, and the ISP of the MnMnT1-terminated interface is also as high as 45%. The transmission curves of Mn2CoAl/Ag/Mn2CoAl reveal that the transmission coefficient at the Fermi level in the majority spin channel is much higher than that in the minority spin channel. Furthermore, the calculated magnetoresistance (MR) ratio of the MnCoT-terminated interface reaches up to 2886%, while that of the MnMnT1-terminated interface is only 330%. Therefore, Mn2CoAl/Ag/Mn2CoAl CPP-SV with an MnCo-terminated interface structure has a better application in a spintronics device. View Full-Text
Keywords: Heusler alloy; spin gapless semiconductor; electronic structure; spin transport Heusler alloy; spin gapless semiconductor; electronic structure; spin transport
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Wei, M.-S.; Cui, Z.; Ruan, X.; Zhou, Q.-W.; Fu, X.-Y.; Liu, Z.-Y.; Ma, Q.-Y.; Feng, Y. Interface Characterization of Current-Perpendicular-to-Plane Spin Valves Based on Spin Gapless Semiconductor Mn2CoAl. Appl. Sci. 2018, 8, 1348.

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