[en] Local M-H loops have been measured on the free layer of a magnetic tunnel junction multilayers using the magneto-optical Kerr effect system, with 2 μm spatial resolution. The relatively irregular variations of coercivity H_C (∼17.5 Oe) and exchange coupling field H_E (∼7.5 Oe) are revealed in as-deposited sample prepared by the DC magnetron sputtering. After 200 deg. C annealing, H_C decreases to 15 Oe, while H_E increases to 20 Oe with smooth local variation. Two-dimensional plots of H_C and H_E show the symmetric saddle shapes with their axes aligned with the pinned layer, where both H_C and H_E variations along free-layer axis are larger than those along pinned-layer axis. The increasing slope per micrometer of normalized H_C and H_E are the same near the junction edge along free-layer direction irrespective of junction size, giving the relatively uniform H_C and H_E for wider junction size