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It was shown that anomalous resistivity behavior of the $Cu-Mn-Al$ ribbons isexplained by the s-d interaction between conduction electrons and the clusteredMn atoms. While nuclear magnetic resonance measurements show theantiferromagnetic and ferromagnetic clusters of Mn atom coexisting withoutlong-range order, it is an interesting problem to study magnetic resonanceproperties also for the antiferromagnetic crystal phase regions (which havelong-range order for larger regions) and which may also occur in these ribbons.The Heusler Type $Cu-Mn-Al$ Alloy has a composition half way between$Cu_{2}MnAl$ and $Cu_{3}Al$. Electron microscopy of the premartensitic $\betaCu-Zn-Al$ alloy has shown that the $\beta Cu-Zn-Al$ alloy quenched from hightemperature has the electron diffraction patterns of this alloy well explainedby the model with the existence of small particles with an orthorhombicstructure. It was noted that an important aspect of improvement in the materialproperties is to create a nanostructured state in matrix, which has significantadvantages in magnetic and mechanical characteristics in contrast to the bulkmaterials in crystalline or amorphous state. It is an interesting problem tostudy magnetic resonance properties not only for the Mn atoms and clusterswithout long-range order but also for the antiferromagnetic crystal phaseregions (which have long-range order for larger regions) which may also occurin ribbons. This is the aim of our paper.

NMR and the antiferromagnetic crystal phase regions in rapidly quenched ribbons and in alloys of the type $Cu-Mn-Al$