A Mössbauer Effect Study of the Magnetic Properties of Nd₂(Fe₁₋ₓCoₓ)₁₄B and Y₂(Fe₁₋ₓCoₓ)₁₄B
The atomic and magnetic structures of Nd₂(Fe₁₋ₓCoₓ)₁₄B, with x equal to 0.0, 0.1, 0.2, and 0.3, and Y₂(Fe₁₋ₓCoₓ)₁₄B 14B, with x equal to 0.0, 0.1, 0.2, 0.3, and 0.4, have been investigated by Mössbauer spectroscopy at room temperature and 85 K. A Mössbauer effect spectral component analysis, based on neutron diffraction site populations in Nd₂(Fe₁₋ₓCoₓ)₁₄B, has revealed a stronger compositional dependence for the hyperfine field and magnetic moment on the j₂ site than is observed for the other five iron sites. A similar analysis for the Y₂(Fe₁₋ₓCoₓ)₁₄B compounds shows lower hyperfine fields and hence moments on the c and e sites, as well as a significant decrease in the hyperfine field at the j₁ site as the cobalt concentration is increased. The iron site hyperfine fields, and their dependence on cobalt content, are consistent with the local site coordination environments in both series of compounds.
D. E. Tharp et al., "A Mössbauer Effect Study of the Magnetic Properties of Nd₂(Fe₁₋ₓCoₓ)₁₄B and Y₂(Fe₁₋ₓCoₓ)₁₄B," Journal of Applied Physics, vol. 61, no. 8, pp. 4334-4336, American Institute of Physics (AIP), Apr 1987.
The definitive version is available at http://dx.doi.org/10.1063/1.338440
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