Anisotropic hyperfine interactions in ferromagnetic hcp Co

D. Fekete*, H. Boasson, A. Grayevski, V. Zevin, N. Kaplan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The anisotropy of the magnetic hyperfine field Hhf, and the angular dependence of the quadrupole splitting νq are measured in an NMR study of a fully magnetized single-crystal sphere of ferromagnetic hcp Co. For M→ rotation in a (1̄21̄0) plane it is found that Hhf=H0+H′[(3cos2ψ-1)2], νq=νqrel+ν′q[(3cos2ψ-1)2], where ψ is the angle between M→ and the c axis. The numerical values are H0=-226 kG, H′=5.73 kG, νqrel=24.5 kHz and ν′q=196.1 kHz. A phenomenological interpretation is given and the data are used to examine some aspects of the band model of hcp Co. It is shown that the isotropic part of νq, i.e. νqrel, can be ascribed to the relativistic contribution of the d band to the electronic-field gradient at the Co59 site. A model in which the orthogonal-plane-wave band calculations concerning the magnetic hyperfine anisotropy can be confronted with the experimental observation is presented.

Original languageEnglish
Pages (from-to)347-354
Number of pages8
JournalPhysical Review B
Volume17
Issue number1
DOIs
StatePublished - 1978

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