Ballistic magnetoresistance in nickel single-atom conductors
  Large ballistic magnetoresistance (BMR) has been measured in Ni single-atom conductors electrodeposited between microfabricated thin films. These measurements irrefutably eliminate any magnetostriction related artifacts in the BMR effect. 
Matthew R. Sullivan, Douglas A. Boehm, Daniel A. Ateya, Susan Z. Hua,   and Harsh Deep Chopra