Effect of 55Mn NMR echo enhancement of nuclei arranged in domain walls of half-metallic Heusler compound NiMnSb in applied magnetic fields

The effect of NMR spin-echo enhancement of
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Mn nuclei arranged in domain walls of half metal Heusler compounds NiMnSb and NiMnSi in applied dc magnetic field was observed and studied. The effect could be related with the increase of spin-spin relaxation time at application of the outer dc magnetic field related with the rearrange and disappearance of the domain wall structure in the half metallic material.