Helical Magnetic Nature of β-Mn Structured CoZn Thin-Films Determined by a Bayesian Approach to Modeling Polarized Neutron Reflectivity Data
Abstract
Chiral magnetic materials can host skyrmions and hence are of interest for numerous spintronic applications including low-power storage. To reach this goal, room temperature operation and a thin film form are needed. We have studied the chiral magnetism in a β-Mn structured CoZn sputtered film, with a Curie temperature of ≈ 130 °C, by means of polarized neutron reflectometry (PNR) in order to reveal its magnetic field-temperature phase diagram. In bulk this material has a helimagnetic ground state. Here we use PNR data to show that the helimagnetism survives in a CoZn film only 100 nm thick, roughly half a helical period. Given the subtlety of differentiating the helical state from a uniform state with reduced interfacial magnetism, we have developed and employed a Bayesian approach that uses model selection to analyze our PNR data and to map out the field-temperature phase diagram of our thin film.
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BibTeX
@misc{dearg2026helical,
title = {{Helical Magnetic Nature of $β$-Mn Structured CoZn Thin-Films Determined by a Bayesian Approach to Modeling Polarized Neutron Reflectivity Data}},
author = {M. Dearg and A. J. Caruana and C. J. Kinane and N. Satchell and G. Burnell and S. Langridge and C. H. Marrows},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00390},
eprint = {2611.00390},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00390},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Helical Magnetic Nature of β-Mn Structured CoZn Thin-Films Determined by a Bayesian Approach to Modeling Polarized Neutron Reflectivity Data
AU - M. Dearg
AU - A. J. Caruana
AU - C. J. Kinane
AU - N. Satchell
AU - G. Burnell
AU - S. Langridge
AU - C. H. Marrows
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00390
UR - https://arxiv.org/abs/2611.00390
AB - Chiral magnetic materials can host skyrmions and hence are of interest for numerous spintronic applications including low-power storage. To reach this goal, room temperature operation and a thin film form are needed. We have studied the chiral magnetism in a β-Mn structured CoZn sputtered film, with a Curie temperature of ≈ 130 °C, by means of polarized neutron reflectometry (PNR) in order to reveal its magnetic field-temperature phase diagram. In bulk this material has a helimagnetic ground state. Here we use PNR data to show that the helimagnetism survives in a CoZn film only 100 nm thick, roughly half a helical period. Given the subtlety of differentiating the helical state from a uniform state with reduced interfacial magnetism, we have developed and employed a Bayesian approach that uses model selection to analyze our PNR data and to map out the field-temperature phase diagram of our thin film.
ER -