skip to main content

SciTech ConnectSciTech Connect

Title: Polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves using Co{sub 2}Mn(Ga{sub 0.25}Ge{sub 0.75}) Heusler alloy

We have studied the structure and magnetoresistive properties of polycrystalline current-perpendicular-to-plane giant magnetoresistance pseudo spin-valves (PSVs) with Co{sub 2}Mn(Ga{sub 0.25}Ge{sub 0.75}) (CMGG) ferromagnetic layers and a Ag spacer. With (110) textured CMGG thin films and (111) textured Ag spacer, the PSVs annealed at 350 °C with 2 nm CoFe buffer layers showed ΔRA of 3.7 mΩ μm{sup 2} and MR ratio of 12.2%, while the PSVs without the buffer layer showed ΔRA of only 1.3 mΩ μm{sup 2}. High angle angular dark field images showed that the drop of ΔRA by annealing was due to the deterioration of the multi-layer CMGG/Ag/CMGG structure. Energy-dispersive X-ray spectroscopy images further confirmed the interdiffusion between CMGG layer and the Ag layer outside the CMGG/Ag/CMGG trilayer. In addition, we discuss the difference in the magnetoresistive properties of polycrystalline and epitaxial PSVs.
Authors:
;  [1] ;  [2] ; ; ; ;  [3]
  1. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan)
  2. (Japan)
  3. National Institute for Materials Science, Tsukuba 305-0047 (Japan)
Publication Date:
OSTI Identifier:
22218249
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 5; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANNEALING; COBALT ALLOYS; GALLIUM ALLOYS; GERMANIUM ALLOYS; IMAGES; IRON ALLOYS; LAYERS; MAGNETORESISTANCE; MANGANESE ALLOYS; POLYCRYSTALS; SPIN; THIN FILMS; VALVES; X RADIATION; X-RAY SPECTROSCOPY