Temperature dependence of a resonance frequency of 59Co NMR in a ferromagnetic Heusler alloy Co2FeSi

Abstract: The temperature dependence of the resonance frequency of 59Co NMR in a ferromagnetic Heusler alloy, Co2FeSi, in zero applied field is reported. The temperature dependence in the range 4.2–300K has been found to be well described by with , and , which corresponds to the spin-wave stiffness constant D of 2.60meVnm2. The behavior is roughly in agreement with the temperature dependence of the macroscopic magnetization and is consistent with the dominance of the spin-wave excitations in Co2FeSi at low temperatures. [Copyright &y& Elsevier]