Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-03-22
J.Appl. Phys.110, 023906 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
22 pages, 5 figures
Scientific paper
10.1063/1.3610948
We use pulsed inductive microwave magnetometry to study the precessional magnetization dynamics of the free layer in CoFeB/MgO/CoFeB based magnetic tunnelling junction stacks with varying MgO barrier thickness. From the field dependence of the precession frequency we are able to derive the uniaxial anisotropy energy and the exchange coupling between the free and the pinned layer. Furthermore the field dependence of the effective damping parameter is derived. Below a certain threshold barrier thickness we observe an increased effective damping for antiparallel orientation of free and pinned layer which would inhibit reversible low current density spin torque magnetization reversal. Such inductive measurements, in combination with wafer probe station based magneto transport experiments, allow a fast determination of the optimum tunnel barrier thickness range for spin torque memory applications in a lithography free process.
Czapkiewicz Maciej
Liebing Niklas
Reiss Günter
Schumacher Hans Werner
Serrano-Guisan Santiago
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