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(Color online) (a) Schematic of the fabrication process: focused ion-beam milling of a double nanoconstriction departing from a 5-μm track. (b) SEM of an LSMO (bright) triple nanoconstriction where we intend to trap magnetic domain walls (the arrow points to the current direction, the scale bar is 500 nm). (c) Fluctuation between Ohmic and tunneling regimes in the characteristic of an LSMO nanoconstriction.
(Color online) Typical and MR vs characteristics for a magnetite (top) and LSMO (bottom) nanoconstriction. The MR can be fitted to a dependence (dotted line).
(Color online) Scaling of the MR at 0 V with the conductance in units of for magnetite and LSMO nanoconstrictions. Open symbols give the distribution of the conductance for samples with no MR. The two lines delimit the region between 1 and 20 %, where most of the results fall with MR .
(Color online) characteristic before (hysteretic) and after a magnetic field is applied for a magnetite (top) and an LSMO (bottom) nanoconstriction. Inset: discrete variations of the resistance with the current.
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