Spin-Resonance Transmission in Paramagnetic Metals

Abstract

A simple description of spin-resonance transmission in a paramagnetic metal is presented and applied to the recent observation of the effect in gadolinium. The resonance condition is shown to be $\gamma B_z={\omega }_0$. As a consequence, resonance transmission occurs at a lower value of applied field than does resonance absorption. In conduction-electron spin-resonance transmission the same condition is shown to hold, and it is suggested that a measurement of the relative separation of the transmission and absorption resonances permits a determination of the conduction-electron spin susceptibility ${\chi }_s$.