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Direct Quantification of Molecular Helicity-Dependent Effective Magnetic Fields in Chiral Polypeptide/Ferromagnet Heterostructures

Helical peptides can still nudge a nearby magnet through an insulating spacer, and the push flips with molecular handedness. The authors measure that enantiomer-dependent effective field directly, giving chirality-induced spin effects a quantitative materials benchmark.

• ▸What: Self-assembled helical polypeptide monolayers produce an enantiomer-dependent effective magnetic field on a ferromagnetic multilayer even when an insulator separates molecule from magnet; MOKE microscopy with molecule-free on-chip references quantifies the hysteresis-loop shift, which reverses with opposite enantiomers and tracks enantiomeric excess.
• ▸Why it matters: Today, precise magnetic control still depends on bulky coils, rare-earth magnets, or hard-to-scale spintronic stacks. A molecular, chirality-tied effective field is a possible path toward cheaper magnetic knobs in hybrid devices — if the effect can be understood and engineered, not just observed in a lab heterostructure.
• ▸Who should care: Spintronics and CISS researchers, magnetic-materials groups building hybrid organic/ferromagnet stacks, and anyone watching whether molecular chirality becomes a practical design handle rather than a curiosity.