Abstract
This paper investigates the use of extended Lorentz microscopy to study the real-time magnetic behavior of magnetic tunnel junctions (MTJs). The formation of a "fur tree" ripple structure prior to the free layer undergoes a magnetic reversal is identified. The quality of the magnetic structure and magnetization reversal process were found to be highly dependant on processing conditions and MTJ layer thickness. Finally, small magnetization fluctuations which are known to be large sources of noise in MTJ devices are observed.
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