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Current perpendicular-to-plane giant magnetoresistance devices using half-metallic Co2Fe0.4Mn0.6Si electrodes and a Ag–Mg spacer
- Source :
- Journal of Physics D: Applied Physics. 50:014004
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- Current perpendicular-to-plane (CPP) giant magnetoresistance (GMR) effects in devices including Co2Fe0.4Mn0.6Si (CFMS)/Ag100−x Mg x /CFMS structures were investigated theoretically and experimentally. First-principles transport calculation revealed that the Fermi surface matching between CFMS and L12 Ag3Mg is better than that between CFMS and fcc-Ag. In the experiments the Mg composition, x was changed from 0 to 26 at.%, in which both face centered cubic phase and L12 phase of Ag–Mg alloys are included depending on the Mg composition. It was confirmed by a cross-sectional high-angle annular dark field scanning transmission electron microscope (HAADF-STEM) image that the Ag–Mg spacer layer with L12 ordered phase was successfully fabricated for x = 22 at.%. The maximum CPP–GMR ratio and the change of the areal resistance () were 56% and 20 mm2, respectively, for x = 22 at.% at room temperature, which is much higher than that of the conventionally used pure Ag spacer devices. It was suggested from the HAADF-STEM images and the results of the temperature dependence of CPP–GMR effects that the diffusion of Mn atoms occurred less at the CFMS/Ag–Mg interfaces for the L12 ordered Ag–Mg spacer devices than the Ag spacer devices, which might be a key factor for the enhancement of the value. The newly developed L12 Ag–Mg spacer is a promising material for realizing large of the CPP–GMR devices.
- Subjects :
- 010302 applied physics
Materials science
Acoustics and Ultrasonics
Condensed matter physics
Magnetoresistance
Fermi level
Nanotechnology
Giant magnetoresistance
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Dark field microscopy
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
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Transmission electron microscopy
Electrical resistivity and conductivity
Phase (matter)
0103 physical sciences
Scanning transmission electron microscopy
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0210 nano-technology
Subjects
Details
- ISSN :
- 13616463 and 00223727
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi...........47ff236e0438bdca83234bd98b3d67f4