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Universal Scaling of Ballistic Magnetoresistance in Magnetic Nanocontacts



S Chung, M Munoz, N Garcia, William F. Egelhoff Jr., Romel Gomez


This paper shows that ballistic magnetoresistance has a universal behavior versus scaled conductance in atomic or nanometer size contacts. New results are presented for half-metallic ferromagnets forming contacts of CrO2-CrO2 and CrO2-Ni that show as much as 400% magnetoresistance. If the maximum magnetoresistance is normalized to unity and the conductance is scaled with the conductivity, then all data points fall in a universal curve independent of the material forming the contact and the conductance mechanism. The analysis has been applied to all available magnetoresistance data in atomic contacts in the literature, and the results are in agreement with a theory that takes into account the scattering with magnetic domain wall for reversal of the spin between the electrodes.
Physical Review Letters
No. 28


ballistic magnetoresistance, chromium dioxide, nickel iron oxide


Chung, S. , Munoz, M. , Garcia, N. , Egelhoff Jr., W. and Gomez, R. (2002), Universal Scaling of Ballistic Magnetoresistance in Magnetic Nanocontacts, Physical Review Letters (Accessed July 20, 2024)


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Created November 30, 2002, Updated October 12, 2021