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Enhancement of spin-asymmetry by L21-ordering in Co2MnSi/Cr/Co2MnSi current-perpendicular-to-plane magnetoresistance devices.
- Source :
- Applied Physics Letters; 1/5/2009, Vol. 94 Issue 1, p012511, 3p, 1 Color Photograph, 3 Graphs
- Publication Year :
- 2009
-
Abstract
- Co<subscript>2</subscript>MnSi/Cr/Co<subscript>2</subscript>MnSi (001)-fully epitaxial current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices were fabricated via an UHV magnetron sputtering system. The relationship between the degree of chemical ordering in Co<subscript>2</subscript>MnSi (CMS) and the CPP-GMR characteristics was investigated systematically against the annealing temperature of the devices. X-ray diffraction profiles and reflection high-energy electron diffraction images indicated that annealing improved L2<subscript>1</subscript>-ordering. The MR ratio also increased upon annealing and the maximum MR ratio of 5.2% and ΔRA of 6.5 mΩ μm<superscript>2</superscript> were achieved by annealing at 400 °C. These results indicate that promoting the degree of L2<subscript>1</subscript>-ordering in CMS enhances the bulk and/or interface spin-asymmetry coefficients. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 94
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 36178184
- Full Text :
- https://doi.org/10.1063/1.3068492