Abstract
The time-dependent dielectric breakdown of Co/Al2O3/Co(-Fe) magnetic tunnel junctions is investigated. At voltages larger than 1.2 V, almost immediate breakdown of the junction is observed, leading to a decreased (magneto)resistance. The shorts, which are local hot spots, were visualized by making use of a liquid crystal film on top of the junction. The breakdown voltages of a series of nominally identical tunnel junctions measured in a voltage-ramp experiment are shown to increase with increasing ramp speed. The results are analyzed in the framework of several models for the voltage dependent breakdown probability.
| Original language | English |
|---|---|
| Pages (from-to) | 2363-2365 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 73 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - 1998 |
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Oepts, W., Verhagen, H. J., Jonge, de, W. J. M., & Coehoorn, R. (1998). Dielectric breakdown of ferromagnetic tunnel junctions. Applied Physics Letters, 73(16), 2363-2365. https://doi.org/10.1063/1.122462