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The broadband ferromagnetic resonance (FMR) linewidth of the free layer ofmagnetic tunnel junctions is used as a simple diagnostic of the quality of themagnetic structure. The FMR linewidth increases near the field regions of freelayer reversal and pinned layer reversal, and this increase correlates with anincrease in magnetic hysteresis in unpatterned films, low frequency noise inpatterned devices, and previous observations of magnetic domain ripple by useof Lorentz microscopy. Postannealing changes the free layer FMR linewidthindicating that considerable magnetic disorder, originating in theexchange-biased pinned layer, is transferred to the free layer.

Broadband Ferromagnetic Resonance Linewidth Measurement of Magnetic Tunnel Junction Multilayers