Physics – Condensed Matter – Materials Science
Scientific paper
2011-12-06
Physics
Condensed Matter
Materials Science
submitted to PRB
Scientific paper
We discuss the effect of mode transitions on the current (I) and temperature (T) dependent linewidth (\Delta f) in nano-contact based spin torque oscillators (STOs). \Delta f exhibits a strongly non-monotonic dependence on I due to the presence of several mode transitions. The I value for these transitions is found to vary with temperature and, as a consequence, \Delta f may either increase or decrease with T depending on the position w.r.t. the mode transition; these results explain conflicting reports of \Delta f vs. T in the literature. An analytical theory of \Delta f in STOs shows very good agreement with experimental results, and allows us to extract the intrinsic linear linewidth (\Delta f_L). As expected from theory, \Delta f_L increases linearly with T, and has a room-temperature value below 100 KHz for the particular STO reported here.
Akerman Johan
Muduli P. K.
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