Microwave-induced Photovoltage due to Ferromagnetic Resonance

Eric Kamp and Jon Kooistra

University of Minnesota

Methods of Experimental Physics Spring 2012

Abstract

We have measured photo voltage induced by ferromagnetic resonance in a permalloy sample (Ni81Fe19?). By placing a short at the end of a microwave waveguide, we generate a standing electromagnetic wave that provides the microwave magnetic field necessary for ferromagnetic resonance. We then look at the dc photo voltage induced by the phase difference between the resistance and the current in the sample. Through this we show that the photo voltage response can be eliminated at the electric field node but cannot be eliminated at the magnetic field node.