An NMR investigation of the intermetallic borides (CO1-xMnx)B and (Co1-xFex)B. II. Ferromagnetic alloys

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Abstract
For pt.I see ibid., vol.10, p.141 (1980). The internal fields in 59Co, 55Mn and 11B in the ferromagnetic alloys (Co1-xMnx)B and (Co1-xFex)B at 4.2K have been measured by use of the spin-echo technique. Well resolved satellite structures of the boron resonance were observed for the two systems. This shows that the B hyperfine field is mainly determined by the interactions with the nearest-magnetic-neighbour atoms. The measurements indicate that, in the (Co-Mn)B system, cobalt atoms that have three or more manganese neighbours carry a ferromagnetic moment of about 0.2 mu B, while the (Co-Fe)B system only iron atoms carry a ferromagnetic moment. This result can be explained by the fact that the magnetic moment of iron in FeB is not large enough to induce a magnetic moment on cobalt.