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.
@article{arxiv.2409.15976,
title = {OpenFMR: A low-cost open-source broadband ferromagnetic resonance spectrometer},
author = {Markus Meinert and Tiago de Oliveira Schneider and Shalini Sharma and Amir Khan},
journal= {arXiv preprint arXiv:2409.15976},
year = {2025}
}