The Co⁵⁹ Nuclear Magnetic Resonance in Hexagonal Cobalt

Electric-field gradients in thin face-centered-tetragonal Co films observed by nuclear magnetic resonance

“…Unstrained fcc Co has a resonance frequency of 217.2± 0.1 MHz at liquid He temperatures ͑B hf = −21.60 T͒. 10,13,21,22 The relative NMR frequency change is linearly proportional to the relative volume change: ⌬f / f = ⌬B hf / B hf =−͑1.13± 0.01͒⌬V / V at room temperature 23,46,47 with f the NMR frequency. At low temperatures the proportionality constant may be estimated to be −1.16± 0.06.…”

A magnetic and Mössbauer spectral study of PrFe11Ti and PrFe11TiH

“…This difference is mainly due to the different orbital contributions to the hyperfine field. The anisotropy in the orbital field results from an incomplete quenching of the orbital moment as a consequence of the anisotropy in the spin-orbit coupling [22,23]. Hence, the stronger anisotropy observed in the 8i hyperfine field indicates that in PrFe 11 Ti and PrFe 11 TiH the incomplete quenching of the orbital moment by the crystallographic surroundings is more effective in the 8i sites than in the 8j sites.…”

C59oNMR study of the allotropic phase transformation in small ferromagnetic cobalt particles

“…Internal field 59 Co NMR of ferromagnetic Co was first observed in 1959 by Gossard and Portis,7 and since then the application of internal-field NMR to ferromagnetic materials has developed considerably. [8][9][10] There has been an extensive subsequent use of 59 Co NMR to characterize the different Co atomic environments ͓fcc, hcp, and sfs͔ in Co metal, [11][12][13][14][15] in Co films, [16][17][18][19] in catalysts, 20,21 and in alloys. [22][23][24][25][26] However, the allotropic phase transformation of small Co particles has never been investigated by NMR spectroscopy.…”