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The magnetic switching processes in mechanically controllable junctions (MCJ), made from high-quality single crystals of La0.7Sr0.3MnO3, are studied as a function of the DC current (up to 109 A/cm2) passing through the nanoconstriction. The current-voltage (I-V) curves of the MCJ are typical for an electron tunnelling process. By fitting I-V curves to the Simmons model, the barrier width (1 - 1.6)...
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