Abstract
The purpose of this paper is to determine by experiment whether Mn 11Si 19 and Mn 4Si 7 in their bulk states have a finite magnetic moment or not. Magnetisation measurements were carried out on these materials using both SQUID system and Kerr rotation system. The high quality samples were grown using the temperature gradient solution growth method. SQUID measurements revealed that Mn 11Si 19 has finite magnetism while Mn 4Si 7 does not in their bulk states. It was also confirmed that Mn 4Si 7 became magnetic and Mn 11Si 19 got to exhibit a distinctive hysteresis in their powdery state. The enhancement of magnetism implied that the surface of the samples was to a great extent linked to its magnetism.
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