In situ magnetoresistance of Ni nanocontacts

Yang, C.-S.; Zhang, C.; Redepenning, J.; Doudin, B.
April 2004
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2865
Academic Journal
Magnetoresistance properties of Ni nanocontacts in the ballistic quantum regime are investigated in situ during closure and opening of electrochemically grown planar electrodes. The magnitude of conductance change when sweeping the magnetic field is of the order of the quantum conductance e2/h for conductance values spanning 1–100 quanta. The relative orientation of electric current and applied magnetic field changes the magnetoresistance sign, with symmetry properties reminiscent of bulk anisotropy magnetoresistance. Ex situ investigations of samples of higher conductance values, of the order of 1000 quanta, unambiguously show the analogy with bulk anisotropy magnetoresistance. © 2004 American Institute of Physics.


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