Nuclear Magnetic Resonance in the Ferromagnetic Intermetallic Compound ZrFe_2

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In this note we report the observation of the nuclear magnetic resonance (NMR) in the ferromagbetic intermetallic compound ZrFe_2. This substance has the Curie point at 586°K and its crystal structure belongs to cubic Laves phase. The samples were prepared from the metallic zirconium (purity 99%) and electrolytic iron (purity 99.9%) of stoichiometric quantities by arc melting in an argon atmosphere and by subsequent annealing at 1,OOO℃ for 24 hours in an evacuated quartz capsule. X-ray powder patterns indicated that there were no other lines than those corresponding to the cubic Laves phase structure. The NMR signal has been detected using a superregenerative spectrometer in zero external field. We searched for the NMR signal of Fe^<57> around the resonance frequency of 26.2 Mc corresponding to the internal field of 190 koe known from Mossbauer experiment, but we could not observe any signal at all. Instead we have found a relatively intense NMR signal at the frequency of 46.1 Mc at room temperature. The resonance frequency of this signal has been measured as a function of temperature over the range from 371°K down to 4.2°K. The figure shows the results together with the spontaneous magnetization of ZrFe_2 as a function of temperature which is normalized at room temperature with the curve of the resonance frequency. For comparison, also included in the figure is the resonance frequency of Fe^<57> in pure iron as a function of temperature.
社団法人日本物理学会の論文
1964-07-05

Nuclear Magnetic Resonance in the Ferromagnetic Intermetallic Compound ZrFe_2

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