Chirp spectroscopy applied to the characterization of Ferromagnetic Resonance in Magnetic Tunnel Junctions

TL;DR

This paper introduces a novel chirp spectroscopy method to efficiently characterize the Ferromagnetic Resonance in Magnetic Tunnel Junctions, reducing measurement complexity by using a single excitation signal.

Contribution

The paper presents a new application of chirp signals for Ferromagnetic Resonance characterization, offering a faster alternative to traditional measurement techniques.

Findings

Chirp spectroscopy accurately reconstructs FMR curves.

The method reduces measurement time compared to traditional techniques.

Micromagnetic simulations validate the effectiveness of the approach.

Abstract

Magnetic Tunnel Junction devices find use in several applications based on the exploitation of the Spin-Transfer Torque phenomenon. The Ferromagnetic Resonance curve is a key characteristic of any Magnetic Tunnel Junctions. It is usually characterized both experimentally and numerically by performing a lot of measurements of the magnetic response to a sinusoidal field or current. Here we propose the use of a chirp signal as excitation signal to reconstruct the Ferromagnetic resonance curve with a single measurement/simulation. A micromagnetic comparison of the proposed method with the traditional one is shown.