Point contact spectroscopy of magnons in metals
Akimenko A.I. , Yanson I.K.
The nonlinearI~Vcharacteristics of Gd, Ho, and Tb point contacts are investigated. The singularities of the dependence of the second derivative d2V/dI2 on eV, which correspond to the singularities of the magnon spectra of these metals, were observed and interpreted as a manifestation of the energy dependence of the electron-magnon interaction.