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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Room-Temperature Perovskite Ferromagnetic Insulator via Three-Dimensional Tensile Strain
Tianyu Li1,2,3, Yali Yang4,5, Shiqing Deng2
1University of Science and Technology Beijing, Department of Physical Chemistry, Beijing 100083, China.
Physical Review Letters
|February 6, 2025
Summary
Novel three-dimensional tensile strain engineering in LaCoO3:MgO nanocomposites creates room-temperature ferromagnetic insulators. This breakthrough achieves a high Curie temperature of 594 K, overcoming limitations for spintronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Ferromagnetic insulators are crucial for low-power spintronic devices.
- Existing materials suffer from rarity and low Curie temperatures, hindering practical applications.
Purpose of the Study:
- To achieve a room-temperature ferromagnetic insulating state in LaCoO3:MgO nanocomposites.
- To explore the use of 3D tensile strain for material property modulation.
Main Methods:
- Fabrication of self-assembled LaCoO3:MgO nanocomposite thin films.
- Atomically resolved electron microscopy for 3D strain quantification.
- Assessment of electronic states and theoretical analysis.
Main Results:
- Achieved a room-temperature ferromagnetic insulating state with a Curie temperature of 594 K.
- Identified +2.6% out-of-plane and +2.1% in-plane tensile strains.
- Correlated strain with ferromagnetic insulating properties via crystal-field splitting and Coulomb interactions.
Conclusions:
- 3D tensile strain engineering is effective for creating high-temperature ferromagnetic insulators.
- This approach utilizes strong spin-lattice coupling in correlated oxides.
- Offers a promising route for next-generation spintronic devices and exotic functionalities.
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