| Author(s): |
William H. Rippard; Matthew R. Pufall; Michael Schneider; Kevin Garello; Stephen E. Russek; |
| Title: |
Spin Transfer Precessional Dynamics in Co60Fe20B20 Nanocontacts |
| Published: |
March 14, 2008 |
| Abstract: |
We report on the precessional dynamics in spin transfer oscillators having Co60Fe20B20 free layers as a function of annealing time at 225 °C. Repeated annealing reduces the critical current Ic by roughly a factor of 3 and increases the tunability of the oscillation frequency with current df/dI. The decrease in Ic correlates with an increasing giant magnetoresistance (GMR) during the first 3 h of annealing. For longer times, df/dI continues to increase, although the GMR does not. The variations in the macroscopic Co60Fe20B20 magnetization parameters and contact dimensions with annealing are not sufficient to account for the later changes. |
| Citation: |
Applied Physics Letters |
| Volume: |
103 |
| Pages: |
pp. 053914-1 - 053914-4 |
| Keywords: |
magnetodynamics;microwave;spin transfer |
| Research Areas: |
Electromagnetics |
| PDF version: |
 Click here to retrieve PDF version of paper (332KB) |
