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Updated: Mar 21, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Published on: July 20, 2022

Hyperfine-Induced Asymmetric Overhauser Field in MAPbI₃ Thin Films.

Guillaume Lagüe¹, Frédérick Bernardot¹, Mauricio Calvo²

¹Institut des NanoSciences, Sorbonne Université, CNRS, Paris 75005, France.

|March 20, 2026

Summary

This summary is machine-generated.

Metal halide perovskites show efficient dynamic nuclear polarization (DNP) due to electron-nuclear spin interactions. This reveals asymmetric hyperfine coupling, enabling nuclear-assisted control of spin coherence in opto-spintronic materials.

Keywords:

Dynamic nuclear polarization Hyperfine interaction Metal halide perovskites Optical spin orientation Photoinduced Faraday rotation

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Area of Science:

Materials Science
Condensed Matter Physics
Quantum Optics

Background:

Metal halide perovskites are key in photovoltaics and optoelectronics.
Understanding spin relaxation mechanisms is crucial for advanced functionalities.
Spin-based optical applications require detailed knowledge of spin dynamics.

Purpose of the Study:

To demonstrate dynamic nuclear polarization (DNP) in MAPbI3 films.
To investigate the mechanisms of spin relaxation and coupling in perovskites.
To explore nuclear-assisted control of spin coherence.

Main Methods:

Dynamic Nuclear Polarization (DNP) experiments on polycrystalline MAPbI3 films.
Measurement of Overhauser fields generated by electron-nuclear spin interactions.
Analysis of DNP field orientation dependence to probe hyperfine asymmetry.

Main Results:

Efficient DNP achieved via electron-hole spin flip-flop processes with nuclear spins.
Significant Overhauser fields generated: up to 35 mT for 207Pb and 15 mT for 127I.
Observed DNP field dependence on magnetic field orientation, indicating asymmetric hyperfine coupling.

Conclusions:

Unveiled a novel regime of asymmetric hyperfine coupling in halide perovskites.
Established strong coupling between electron/hole spins and nuclear spin baths (Pb and I).
Provided a foundation for nuclear-assisted spin coherence control in solution-processed opto-spintronic materials.