Unconventional magnetoelastic behavior in Al rich CoFeAl Films with inverse Heusler like local order for flexible spintronics
Abstract
Strain engineering of magnetic properties offers a promising route toward flexible spintronic applications. Here, we report an unconventional magnetoelastic response in Al rich Co Fe Al thin films on flexible substrates using strain dependent magneto optical Kerr effect microscopy and magnetometry measurements. While the films exhibit a conventional positive magnetostriction coefficient, consistent with standard in plane easy axis rotation under stress, their saturation magnetization increases under compressive strain and decreases under tensile strain. First principles calculations reveal that this unconventional response originates from a strain induced competition between exchange splitting and crystal field effects in an inverse Heusler like local environment created by Al enrichment. This leads to a highly sensitive, sublattice dependent magnetic state, consistent with a strain induced reconfiguration of Co and Fe moments. Our results demonstrate that local compositional tuning can fundamentally alter magnetoelastic behavior, establishing strain controlled sublattice compensation as a route toward programmable magnetic functionality in flexible spintronic systems.
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BibTeX
@misc{chhatoi2026unconventional,
title = {{Unconventional magnetoelastic behavior in Al rich CoFeAl Films with inverse Heusler like local order for flexible spintronics}},
author = {Rupalipriyadarsini Chhatoi and Anuroopa Behatha and Swayang Priya Mahanta and Shubhransu Sahoo and Soubhagya Dash and Bhuvneshwari Sharma and Abhisek Mishra and Esita Pandey and Satadeep Bhattacharjee and Subhankar Bedanta},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.31545},
eprint = {2609.31545},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.31545},
}
RIS
TY - UNPB
TI - Unconventional magnetoelastic behavior in Al rich CoFeAl Films with inverse Heusler like local order for flexible spintronics
AU - Rupalipriyadarsini Chhatoi
AU - Anuroopa Behatha
AU - Swayang Priya Mahanta
AU - Shubhransu Sahoo
AU - Soubhagya Dash
AU - Bhuvneshwari Sharma
AU - Abhisek Mishra
AU - Esita Pandey
AU - Satadeep Bhattacharjee
AU - Subhankar Bedanta
PY - 2026
DA - 2026/09/25
PB - arXiv
DO - 10.48550/arxiv.2609.31545
UR - https://arxiv.org/abs/2609.31545
AB - Strain engineering of magnetic properties offers a promising route toward flexible spintronic applications. Here, we report an unconventional magnetoelastic response in Al rich Co Fe Al thin films on flexible substrates using strain dependent magneto optical Kerr effect microscopy and magnetometry measurements. While the films exhibit a conventional positive magnetostriction coefficient, consistent with standard in plane easy axis rotation under stress, their saturation magnetization increases under compressive strain and decreases under tensile strain. First principles calculations reveal that this unconventional response originates from a strain induced competition between exchange splitting and crystal field effects in an inverse Heusler like local environment created by Al enrichment. This leads to a highly sensitive, sublattice dependent magnetic state, consistent with a strain induced reconfiguration of Co and Fe moments. Our results demonstrate that local compositional tuning can fundamentally alter magnetoelastic behavior, establishing strain controlled sublattice compensation as a route toward programmable magnetic functionality in flexible spintronic systems.
ER -