Abstract
Measured magnetization and hyperfine fields at T∼0 K for and , with Z=H, C, or N and δ∼0.5, are analyzed to determine the influence of the interstitial atoms on the 3d magnetism. All are weak ferromagnets with a nearly-full 3d subband, although when Z=N, the magnetic moment of 38.1 is very close to the fully saturated value of 39.4. On a local scale, the order of hyperfine fields (=35 T)> (=33 T)> (=30 T)> (=28 T) is different from that of the local magnetic moments given by several recent band calculations for , (=2.5)> (=2.2)> (=2.0)> (=1.9 ), reflecting a large 4s-transferred hyperfine field at 6g sites which have very short Fe-Fe distances. The volume of samples with Z=C and N are identical, and so the chemical effects of the interstitials can be distinguished; both the local magnetic moment and hyperfine fields are systematically smaller in the carbide than the nitride by 5% and 12%, respectively.
- Received 26 December 1991
DOI:https://doi.org/10.1103/PhysRevB.45.12278
©1992 American Physical Society