OpenFMR: A low-cost open-source broadband ferromagnetic resonance spectrometer

TL;DR

OpenFMR is an affordable, open-source broadband ferromagnetic resonance spectrometer designed for scientific and educational use, featuring a frequency range up to 30 GHz and easy assembly with off-the-shelf components.

Contribution

It introduces a low-cost, open-source spectrometer with detailed design, software, and analysis tools for broad scientific and educational applications.

Findings

Successfully measured ferromagnetic thin films at 1 nm thickness

Demonstrated system capabilities with various ferromagnetic samples

Published all designs and scripts under open-source license

Abstract

We describe a broadband ferromagnetic resonance spectrometer for scientific and educational applications with a frequency range up to 30 GHz. It is built with low-cost components available off-the-shelf and utilizes 3D printed parts for sample holders and support structures, and requires little assembly. A PCB design for the grounded coplanar waveguide (GCPW) is presented and analysed. We further include a software suite for command-line or script driven data acqusition, a graphical user interface, and a graphical data analysis program. The capabilities of the system design are demonstrated with measurements on ferromagnetic thin films with a thickness of 1 nm. All designs and scripts are published under the GNU GPL v3.0 license.