Influence of Radio-Frequency Magnetic Fields on the Mössbauer Effect in MagneticCo57Sources

Abstract

Experiments are described that demonstrate the destruction of the Mössbauer hyperfine pattern by the action of a radio-frequency magnetic field. Two possible mechanisms for the effect are considered: magnetostriction and domain-wall passage. Calculations make magnetostriction seem unlikely, leaving as the probable cause the fluctuations in the $\gamma$-ray energy resulting from the alteration in the direction of the hyperfine field after the passage of a domain wall. This is calculated with the aid of the theory of motional narrowing in NMR and a demonstration by Peshkin of the correspondence between the $\gamma$ ray and the NMR case. The hypothesis of 180° walls is found to be inadequate, and a less restrictive assumption is needed.