The nuclear magnetic resonance (NMR) of Ni 61 in Nickel-ferrite at zero external field has been observed at liquid air temperature by using the pulsed NMR method. The spin echo signal could be observed in the frequency range from 31 Mc/sec to 38 Mc/sec. The center frequency (34.5 Mc/sec) corresponds to the value of about 97 KOe of hyperfine field, which could be accounted for as the sum of the core polarized and the orbital hyperfine fields of Ni 2+ ion. This value is consistent with the hyperfine coupling constant of paramagnetic Ni 2+ ion diluted in Al 2 O 3 .
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Hisashi Abe (1965) studied this question.
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