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Perpendicular magnetic tunnel junction (p-MTJ) spin-valves designed with a top Co2Fe6B2 free layer and a nanoscale-thick tungsten bridging and capping layer
- Authors
- Lee, Seung-Eun; Shim, Tae-Hun; Park, Jea-Gun
- Issue Date
- Nov-2016
- Publisher
- Nature Publishing Group
- Citation
- NPG Asia Materials, v.8, no.11, pp 1 - 5
- Pages
- 5
- Indexed
- SCIE
SCOPUS
- Journal Title
- NPG Asia Materials
- Volume
- 8
- Number
- 11
- Start Page
- 1
- End Page
- 5
- ISSN
- 1884-4049
1884-4057
- Abstract
- Recently, p-MTJ spin-valves with top Co2Fe6B2 free layers have been widely studied. They potentially experience crystallinity degradation in the face-centered-cubic (fcc) structure of the MgO tunneling barrier as a result of the diffusion of Ta atoms and a significant amount of Fe atoms from the Co2Fe6B2 free and pinned layers. A new design of the p-MTJ spin-valve using a nanoscale-thick W bridging and capping layer demonstrated the absence of significant crystallinity degradation in the fcc structure and showed a limited diffusion of Fe atoms, thus achieving a TMR ratio of similar to 143% at an ex-situ annealing temperature of 400 degrees C.
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