Journal
CHINESE JOURNAL OF CHEMICAL PHYSICS
Volume 34, Issue 3, Pages 273-280Publisher
CHINESE PHYSICAL SOC
DOI: 10.1063/1674-0068/cjcp2009170
Keywords
Magnetic tunnel junction; Spin-dependent transport; First-principles; Tunneling magnetoresistance
Categories
Funding
- National Natural Science Foundation of China [21873088, 11634011]
- Natural Science Foundation of the Anhui Higher Education Institutions [KJ2010A061, KJ2016A144]
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The study reveals that the magnetic tunnel junction exhibits near perfect spin-filtering effect in the parallel magnetization configuration, resulting in a huge tunneling magnetoresistance. This effect is mainly attributed to the half-metallic nature of Co2MnSi electrodes and the significant spin-polarization of the interfacial Ti 3d orbital.
Magnetic tunnel junction with a large tunneling magnetoresistance has attracted great attention due to its importance in the spintronics applications. By performing extensive density functional theory calculations combined with the nonequilibrium Green's function method, we explore the spin-dependent transport properties of a magnetic tunnel junction, in which a non-polar SrTiO3 barrier layer is sandwiched between two Heusler alloy Co2MnSi electrodes. Theoretical results clearly reveal that the near perfect spin-filtering effect appears in the parallel magnetization configuration. The transmission coefficient in the parallel magnetization configuration at the Fermi level is several orders of magnitude larger than that in the antiparallel magnetization configuration, resulting in a huge tunneling magnetoresistance (i.e. > 106), which originates from the coherent spin-polarized tunneling, due to the half-metallic nature of Co2MnSi electrodes and the significant spin-polarization of the interfacial Ti 3d orbital.
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