Magnetoresistance of chromium dioxide powder compacts
Citation:J M D Coey, A E Berkowitz, L Balcells, F F Putris and A Barry 'Magnetoresistance of chromium dioxide powder compacts' in Physical Review Letters, 80, (17), 1998, pp 3815 - 3818
Magnetoresistance.pdf (published (publisher copy) peer-reviewed) 186.5Kb
Cold-pressed powders of the half-metallic ferromagnet CrO2 are dielectric granular metals. Hysteretic magnetoresistance with maxima at the coercive field arises from interparticle contacts. Dilution with insulating antiferromagnetic Cr2O3 powder reduces the conductivity by 3 orders of magnitude, but enhances the magnetoresistance ratio which reaches 50% at 5K. The negative magnetoresistance is due to tunneling between contiguous ferromagnetic particles along a critical path with a spin-dependent Coulomb gap.
Author: COEY, JOHN MICHAEL DAVID
Publisher:American Physical Society
Series/Report no:Physical Review Letters
Availability:Full text available