The local structures around Co atoms in Co2 FeSi1-x Alx (x=0, 0.5, and 1.0) Heusler alloys have been investigated using C 59 o NMR spin-echo method and their effect on the tunneling magnetoresistance for the junctions using Co2 FeSi0.5 Al0.5 electrodes has been discussed. The C 59 o NMR spectra of the Heusler alloys are extremely sensitive to the site disorder and clearly distinguish among the A2, B2, and L 21 structures providing quantitative information on the amount of disorder. The tunnel magnetoresistance for the junctions is demonstrated to be sensitive to the site disorder in Co2 FeSi0.5 Al0.5 electrodes.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2008 6 19|
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