Iron nitride's magnetoelastic properties show potential for flexible spintronics, low-cost large-area flexible sheet-type sensors, wearables

https://phys.org/news/2025-04-iron-nitride-magnetoelastic-properties-potential.html

"detects small changes in mechanical stress through electrical resistance modulation... control over magnetoelastic properties of materials with significant magnetoresistance effects: Fe4N and its substituted variants, Fe4-xMnxN and Fe4-yCoyN (all widely available).... single-crystal nitride films on strontium titanate substrates exhibit:  -121 ppm negative magnetostriction in Fe4N, +46 ppm positive magnetostriction in Fe2.3Co1.7N, indicating magnetoelastic property modulated through elemental substitution"