The measurement of spin glass in zero magnetic field is essential to investigate the intrinsic nature of spin glass. We pay attention to tunnel resistance between spin-glass layers. The temperature dependence of tunnel resistance between spin-glass layers with the structure of AgMn / Al2 O3 / AgMn was measured, and was compared with that of Al / Al2 O3 / AgMn. For the junction of AgMn / Al2 O3 / AgMn, tunnel resistance shows a peak around the spin-glass transition temperature, but no peak was observed for the junction of Al / Al2 O3 / AgMn. The results indicate that the magnetic correlation between spin-glass layers is reflected to tunnel resistance. The singularity of the tunnel resistance between spin-glass layers is discussed by the droplet theory.
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