Magnetoresistance of electrochemically produced nickel nanocontacts with quantized conductance

Nickel nanocontacts with quantized conductance have been obtained with the use of the electrochemical method of the formation of atomic-size contacts. The conductance jumps in the absence of the magnetic field are multiple of e ²/h in most experiments. The maximum magnetoresistance reaches 210%. The performed current-voltage investigations make it possible to determine the conditions necessary for forming nanocontacts with giant magnetoresistance, as well as a possible cause of the absence of magnetoresistance in some electrochemically formed nanocontacts.