Nuclear Magnetic Resonance of Mn^<55> in Manganese Ferrite

概要

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The nuclear magnetic resonance (NMR) of Mn^<55> in ferrimagnetic manganese ferrite (MnFe_2O_4) was studied by using a pulsed NMR method. A pulsed NMR apparatus operating in the UHF range was constructed, as described in detail. The signal was observed in the temperature range from 9O°K to 450°K and in the external field up to 14000 Oe. The observed temperature dependence of the resonance frequency was proportional to T^<3/2> in the lower temperature range and the resonance frequency extrapolated to O°K was 594Mc/sec, corresponding to the value of 563 KOe of hyperfine field. The nuclei involed have been identified as associated with Mn^<2+> ions located on the tetrahedral site in the spinel lattice from the external field dependence of resonance frequency. In the frequency range between 450 and 620 Mc/sec, other signals (e. g. those associated with Mn^<2+> or Mn^<3÷> on the octahedral site) were not observed at room temperature. The dynamical characters of the spin echo signal (enhacement and relaxation) were also studied.
社団法人日本物理学会の論文
1964-07-05