Data and scripts from: Measuring the ferromagnetic resonance cone angle via static dipolar fields using diamond spins

Abstract

Please cite as: Brendan McCullian, Michael Chilcote, Huma Yusuf, Ezekiel Johnston-Halperin, Gregory Fuchs. (2025) Data and scripts from: Measuring the ferromagnetic resonance cone angle via static dipolar fields using diamond spins. [dataset] Cornell University Library eCommons Repository. https://doi.org/10.7298/w5q0-1g13These files contain data supporting all results reported in McCullian et al., Measuring the ferromagnetic resonance cone angle via static dipolar fields using diamond spins. In McCullian et al. we demonstrate quantitative measurement of the ferromagnetic resonance (FMR) precession cone angle of a micro-scale sample of vanadium tetracyanoethylene (V[TCNE]$_{x\sim 2}$) using diamond spins. V[TCNE]$_{x\sim 2}$ is a low-damping, low-magnetization ferrimagnet with potential for scalable spintronics applications. Our study is motivated by the persistent need for quantitative metrology to accurately characterize magnetic dynamics and relaxation. Recently, diamond spins have emerged as sensitive probes of static and dynamic magnetic signals. Unlike analog sensors that require additional calibration, diamond spins respond to magnetic fields via a frequency shift that can be compared with frequency standards. We use a spin echo-based approach to measure the precession-induced change to the static stray dipolar field of a pair of V[TCNE]$_{x\sim 2}$ discs under FMR excitation. Using these stray dipolar field measurements and micromagnetic simulations, we extract the precession cone angle. Additionally, we quantitatively measure the microwave field amplitude using the same diamond spins, thus forming a quantitative link between drive and response. We find that our V[TCNE]$_{x\sim 2}$ sample can be driven to a cone angle of at least 6$^{\circ}$ with a microwave field amplitude of only 0.53 G. This work highlights the power of diamond spins for local, quantitative magnetic characterization.The design and fabrication of our device, all the measurements, and all data analysis were supported by the Department of Energy Office of Science, Basic Energy Sciences Quantum Information Sciences program (DE-SC0019250). The diamond substrate and microwave antenna fabrication made use of facilities at the Cornell NanoScale Facility, an NNCI member supported by the NSF (NNCI-2025233) and the Cornell Center for Materials Research Shared Facilities which were supported through the NSF MRSEC program (DMR-1719875). For the V[TCNE]$_x$ disc fabrication, the authors acknowledge partial support from the NanoSystems Laboratory User Facility supported by the Center for Emergent Materials, an NSF MRSEC (DMR-2011876)