Abstract
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.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 50th Annual Conference on Magnetism & Magnetic Materials, 30 October - 3 November 2005, San José, California, USA |
| Pages | 08E503-1/3 |
| DOIs | |
| Publication status | Published - 2005 |
Publication series
| Name | Journal of Applied Physics |
|---|---|
| Volume | 99 |
| ISSN (Print) | 0021-8979 |
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Paluskar, P. V., Kohlhepp, J. T., Swagten, H. J. M., & Koopmans, B. (2005). Co72Fe20B8 : structure, magnetism, and tunneling spin polarization. In Proceedings of the 50th Annual Conference on Magnetism & Magnetic Materials, 30 October - 3 November 2005, San José, California, USA (pp. 08E503-1/3). (Journal of Applied Physics; Vol. 99). https://doi.org/10.1063/1.2163328