Calorimetric Detection of NMR in Ferromagnets

Abstract
Elevation of lattice temperature above 4.2°K on passage through NMR in ferro‐ and ferrimagnets was detected in a calorimeter. Faint signals corresponding to the resonances of 57Co nuclei in fcc Co metal and 55Mn nuclei in MnFe2O4 were seen at their respective frequencies. Sensitivity considerations and details are presented.