NMR enhancement of a modulating field due to the anisotropic component of the hyperfine field in hcp Co and Y Co 5
1977; American Physical Society; Volume: 15; Issue: 7 Linguagem: Inglês
10.1103/physrevb.15.3305
ISSN0556-2805
AutoresC. W. Searle, H. P. Kunkel, Š. Kupča, I. Maartense,
Tópico(s)Advanced MRI Techniques and Applications
ResumoModulation of the $^{59}\mathrm{Co}$ NMR spin-echo envelope in hcp Co and Y${\mathrm{Co}}_{5}$ results from the application of a small 80-kHz field. The modulating field is enhanced parallel to the local axis of quantization by an enhancement factor ${\ensuremath{\eta}}_{\ensuremath{\parallel}}$ which varies with position in the domain wall. The maximum enhancement factor is found to be \ensuremath{\sim}80 in hcp Co and \ensuremath{\sim}1000 in Y${\mathrm{Co}}_{5}$. When ${\ensuremath{\eta}}_{\ensuremath{\parallel}}$ is taken to arise from an anisotropic component of the hyperfine field it is estimated that this anisotropic component has a magnitude of 5.7 kOe in hexagonal Co and 60 kOe in Y${\mathrm{Co}}_{5}$.
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