Powder magnetoresistance of Co2Cr0.6Fe0.4Al/ Al2O3 powder compacts

Block, T.; Wurmehl, S.; Felser, C.; Windeln, J.

doi:10.1063/1.2200571

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Powder magnetoresistance of Co₂Cr_0.6Fe_0.4Al/ Al₂O₃ powder compacts

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Block, T., Wurmehl, S., Felser, C., & Windeln, J. (2006). Powder magnetoresistance of Co₂Cr_0.6Fe_0.4Al/ Al₂O₃ powder compacts. Applied Physics Letters, 88(20): 202504, pp. 1-3. doi:10.1063/1.2200571.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-6723-8

Abstract

We report on the magnetotransport properties of Co2Cr0.6Fe0.4Al mixed with insulating Al2O3. The powder compacts show a maximum magnetoresistance of 88% at a saturation moment of 0.125 T at 295 K. Different explanations for the reversible mechanism will be discussed, such as tunneling between contiguous ferromagnetic grains, particle movement, and magnetostriction. The effect in Co2Cr0.6Fe0.4Al/Al2O3 powder compacts is the largest room temperature magnetoresistance that has been measured until now.