A short-circuited coplanar waveguide for low-temperature single-port ferromagnetic resonance spectroscopy set-up to probe the magnetic properties of ferromagnetic thin films

TL;DR

This paper introduces a simple, low-temperature compatible coplanar waveguide design for ferromagnetic resonance spectroscopy, enabling detailed magnetic property measurements of thin films across various frequencies.

Contribution

The paper presents a novel short-circuited coplanar waveguide design that simplifies low-temperature FMR measurements and allows for comprehensive magnetic property analysis of thin films.

Findings

Successfully measured Gilbert damping and magnetization of Py and Co films.

Demonstrated temperature and thickness dependence of magnetic parameters.

Provided a versatile setup suitable for cryogenic FMR studies.

Abstract

A coplanar waveguide shorted in one end is proposed, designed, and implemented successfully to measure the properties of magnetic thin films as a part of the vector network analyzer ferromagnetic resonance (VNA-FMR) spectroscopy set-up. Its simple structure, potential applications and easy installation inside the cryostat chamber made it advantageous especially for low-temperature measurements. It provides a wide band of frequencies in the gigahertz range essential for FMR measurements. Our spectroscopy set-up with short-circuited coplanar waveguide has been used to extract Gilbert damping coefficient and effective magnetization values for standard ferromagnetic thin films like Py and Co. The thickness and temperature dependent studies of those magnetic parameters have also been done here for the afore mentioned magnetic samples.