Nuclear Magnetic Resonances of Mn^<55> and N^<14> in Ferrimagnetic Intermetallic Mn_4N -- Anisotropic and Transferred Hyperfine Fields in Intermetallic Compound

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NMR of Mn^<55> and N^<14> in Mn_4N were studied in its ferrimagnetic ordered phase, by using both pulsed and steady state methods. Three resonance lines are separately observed from corner site Mn (Mn-I), face-centered site Mn (Mn-II) and N. The resonance line of Mn-II is much broader than those of Mn-I and N, and has a complex structure, which can be accounted for as a powder pattern of quadrupole split lines modified by an anisotropic hyperfine interaction. The hyperfine field at Mn-I is antiparallel to, and those at Mn-II and N, are parallel to the macroscopic magnetization. Resonance frequencies of Mn-I and N decrease with temperature as usual, whereas that of Mn-II increases initially with temperature, it then follows a steep fall off. From the temperature dependences of these resonance frequencies and sub-lattice magnetizations, derived by neutron diffraction, the phenomenological isotropic hyperfine coupling constants including the transferred hyperfine coupling are estimated. Some discussions are given of these results.
社団法人日本物理学会の論文
1967-02-05