| Autor: |
Paluskar, P. V., Kohlhepp, J. T., Swagten, H. J. M., Koopmans, B. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 4/15/2006, Vol. 99 Issue 8, p08E503, 3p, 3 Graphs |
| Abstrakt: |
We present measurements of tunneling spin polarization of Co72Fe20B8 in Al/AlOx/CoFeB tunnel junctions using superconducting tunneling spectroscopy. We consistently observe high spin polarization (above 53%), higher than that measured for comparable CoFe alloys, indicating a crucial role played by the 8% atomic boron. X-ray diffraction measurements on 700 Å thick films reveal an amorphous structure for as-deposited films, while anneals above 250 °C initiate a gradual crystallization. Superconducting quantum interference device magnetometery shows that the magnetic moment exhibits minor changes after anneals, but there is a dramatic change in the coercivity after anneals above 400 °C. However, these structural and magnetic changes induce only a slight change in the tunneling spin polarization of CoFeB. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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