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Electrical Control of Magnetism through Proton Migration in Fe3O4/Graphene Heterostructure
Weikang Liu1, Liang Liu1, Bin Cheng1
1School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China.
Nano Letters
|May 26, 2022
Summary
Researchers demonstrate reversible control of iron oxide magnetism using selective proton migration through bilayer graphene. This method offers a precise way to tune material properties by managing single ion movement.
Area of Science:
- Solid-state physics and materials science.
- Nanomaterials and spintronics.
Background:
- Ion migration significantly impacts crystal lattice, electron configuration, and spin polarization, thereby altering material properties.
- Electric field control of ion migration often leads to complex, multi-ion movement, hindering precise property manipulation.
Purpose of the Study:
- To achieve controllable and selective single ion migration for unambiguous manipulation of material properties.
- To explore a novel method for reversibly controlling the magnetic moments of iron oxide (Fe3O4).
Main Methods:
- Utilized ionic liquid gating to induce and control ion migration.
- Employed a bilayer graphene structure as a selective ion sieve.
- Investigated the migration of protons as the primary charge carrier.
Main Results:
- Demonstrated reversible control of Fe3O4 magnetic moments through pure proton migration.
- Bilayer graphene effectively filtered ions, allowing only proton passage and preventing oxygen ion or hydroxyl group migration.
- Confirmed the reversibility of magnetic property changes, linked directly to proton migration.
Conclusions:
- Selective proton migration, facilitated by bilayer graphene, provides a precise mechanism for controlling material magnetism.
- This approach offers a pathway for electrically sketching functionalities in solid-state materials via controlled ion migration.
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