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|Author(s):||William H. Rippard; Matthew R. Pufall; Michael L. 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|
|Pages:||pp. 053914-1 - 053914-4|
|PDF version:||Click here to retrieve PDF version of paper (340KB)|