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.
Highlights
The current-perpendicular-to-plane spin valve (CPP-SV) is regarded as one of the most significant spintronics devices, and has great potential for spin transfer torque devices in spin random access memory and ultra-high-speed reading in magnetic read heads of hard disk drivers [1–4].The generation and detection of highly polarized spin current is one of the foremost challenges of a CPP-SV
Half metallic Heusler alloys (HMHA) usually have a high Curie temperature (TC ) and their lattice constants are close to Ag and Cu
A Heusler alloy ratio of spin basedproperties, on a Heusler alloy severely dependsoutstanding on its interface properties, in order depends on valves its interface and in order to explore candidates for and CPP-SV, we to explore for CPP-SV, we study the interface magnetism, electronic structure, study theoutstanding interface candidates magnetism, electronic structure, and spin transport properties of and transport2CoAl properties of Mn2 CoAl/Ag/Mn2 CoAl CPP-SV
Summary
The current-perpendicular-to-plane spin valve (CPP-SV) is regarded as one of the most significant spintronics devices, and has great potential for spin transfer torque devices in spin random access memory and ultra-high-speed reading in magnetic read heads of hard disk drivers [1–4]. Number Co of CPP-SVs employing a 2Heusler alloy as the spin injector, spin injector, as Co2aMnSi/Ag, 2FeAl0.5Si0.5. MR ratio of spin great valves based for on spintronics. A Heusler alloy ratio of spin basedproperties, on a Heusler alloy severely dependsoutstanding on its interface properties, in order depends on valves its interface and in order to explore candidates for and CPP-SV, we to explore for CPP-SV, we study the interface magnetism, electronic structure, study theoutstanding interface candidates magnetism, electronic structure, and spin transport properties of and transport2CoAl properties of Mn2 CoAl/Ag/Mn2 CoAl CPP-SV. Addition, according to previous works, a pure Mn-modified which is is noted noted as as MnCo. Mn-modified artificial termination termination could improve the the spin spin polarization polarization [27,28],.
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