Ferromagnetic Resonance Measurement Using a Novel Short Circuited Coaxial Probe Technique

A Corona-Chavez,J L Olvera-Cervantes,M D V Bhyrava,T Kaur

doi:10.7716/aem.v6i3.526

Abstract

A versatile technique to characterize the ferromagnetic resonance (FMR) of ferrite samples using a short circuited coaxial probe is presented. The technique has sensitivity comparable to that of well-established methods besides its non-contact nature, broadband and local. Detailed theoretical approach and simulation studies (Proof of Concept) using HFSS are presented. Microwave measurements on different single crystal and polycrystalline samples (Yttrium Iron Garnet (Y3Fe5O12) YIG and Nickel Ferrite (NiFe2O4) NFO have been performed. We measured the FMR response of these samples as a function of frequency and the data showed the expected variation for both in plane and out of plane magnetic fields.

Highlights

IntroductionThe great diversity of ferrites permits coverage over a wide range of frequencies (from kHz to tens of GHz) for a set of appropriate properties
The great diversity of ferrites permits coverage over a wide range of frequencies for a set of appropriate properties
The behavior of all microwave ferrite devices can be explained in terms of Faraday rotation and ferromagnetic resonance (FMR)

Summary

Introduction

The great diversity of ferrites permits coverage over a wide range of frequencies (from kHz to tens of GHz) for a set of appropriate properties. The probe was designed by soldering the inner and outer conductors of the coax, resulting in a probe that can couple the RF field magnetic field to the sample This technique is further extended using a thin wire bond to short the coax by Mircea et al [10]. The theoretical support, design, simulation and microwave measurements of the proposed method on different magnetic materials. With this approach, we have successfully detected localized FMR signals on different magnetic samples (YIG single crystal thin film samples, polycrystalline yttrium iron garnet (YIG) and polycrystalline Nickel Ferrite samples) at different frequencies. While the samples studied in this experiment is relatively large with millimeter-size dimensions, limited by the wavelength of the excited magneto static waves

Theory

Results and Discussion

Conclusions