Magnetization reversal probed by spin-polarized tunneling

Jo, Moon-Ho; Mathur, N. D.; Blamire, M. G.
April 2002
Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2722
Academic Journal
We report magnetic reversal processes in the magnetic tunnel junction (MTJ) based on a half metallic manganite, La[sub 0.7]Ca[sub 0.3]MnO[sub 3] by comprehensive spin-polarized tunneling (SPT) measurements. The large tunnel magnetoresistance up to 77% of (R[sub ap]-R[sub p])/R[sub ap] in the present MTJ is highly sensitive to the local magnetization fluctuation in the ferromagnetic electrodes and thus enables us to establish an instantaneous one-to-one correlation between the magnetization reversal and the SPT with the two-dimensional SPT measurements. We have found the systematic angular variations of the SPT features in the resistance-field curves, and based on the observed angular dependences, we propose a crucial role of the edge-domain pinning and the resultant multi-domain breakup for the magnetization reversal. © 2002 American Institute of Physics.


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