The Local Magnetic Fields Probed by µ+ in hcp Ferromagnets: Co and Gd

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Abstract
The local magnetic fields at an interstitial µ + in single crystals Co and Gd have been measured by the µSR method in the temperature range from 4.2 K to 693 K, and from 4.2 K to 250 K, respectively. An anomalous variation is observed in the temperature range where the change of the direction of easy magnetization occurs, whose gross feature is explained by the change of the magnetic dipolar field from the moments of surrounding atoms. It is concluded that the µ + prefers to stay at an octahedral interstitial site and feels a nearly classical dipolar field. After the correction was made for dipolar field and Lorentz field, the contact hyperfine fields at T =0 are found to be –6.1 kOe for Co and –7.5 kOe for Gd, both decreasing with increasing temperature faster than the bulk magnetization. Comparison is made with µ + hyperfine fields in other ferromagnets, Ni and Fe.

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