Hyperfine fields and magnetic interactions in Heusler alloys

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Abstract
The authors have studied transition and noble metal site NMR spectra of stoichiometric, off-stoichiometric and substituted Heusler alloys. The hyperfine fields can be analysed consistently in terms of local and transferred contributions. The transferred fields are negative at near neighbour and second neighbour to a Mn site, and positive at third neighbour. In many cases excess Mn atoms substituted onto Z sites form antiferromagnetic good local moments in these ferromagnetic hosts with strongly anomalous hyperfine field temperature dependences. Both the transferred fields and the Mn-Mn coupling follow the predictions of a Friedel-Anderson d resonance model correctly treated in the preasymptotic region. The local hyperfine fields at Mn sites are very similar to fields in dilute Mn alloys, while the local fields at Co sites are positive indicating unquenched local orbital moments on the Co atoms.
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