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Large Temperature-invariant Anomalous Nernst Effect in Non-collinear Antiferromagnet Mn3Pt
Pengwei Gong1, Xiaolin Zhang2, Wei Zhu1
1School of Physics Science and Engineering, Tongji University, Shanghai, China.
Summary
Researchers discovered a giant anomalous Nernst effect (ANE) in manganese platinum (Mn3Pt) thin films. This discovery paves the way for faster, more energy-efficient spintronic devices resilient to magnetic fields.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Next-generation spintronic devices utilize noncollinear antiferromagnets (nc-AFMs) for enhanced speed, energy efficiency, and magnetic field resilience.
- nc-AFMs exhibit significant Berry curvature, enabling substantial magnetoelectric effects like the anomalous Nernst effect (ANE) even without net magnetization.
Purpose of the Study:
- To discover and characterize a giant and temperature-invariant ANE in epitaxial Mn3Pt thin films.
- To explore the potential of nc-AFMs for advanced thermoelectric and spintronic applications.
Main Methods:
- Epitaxial growth of high-quality Mn3Pt thin films with controlled compositions.
- Experimental measurement of the anomalous Nernst effect (ANE) coefficient.
- Theoretical calculations to understand the electronic and spin structures.
Main Results:
- A giant ANE coefficient of up to 0.71 µV/K was observed in Mn3Pt at room temperature.
- The ANE in Mn3Pt demonstrated remarkable temperature invariance, enabling a wide operating window.
- Composition tuning of Mn-3d orbital states was identified as the key factor governing the Berry curvature and ANE performance.
Conclusions:
- Mn3Pt exhibits exceptional ANE properties, outperforming other nc-AFMs.
- Composition tunability offers a promising route for developing practical nc-AFM spintronic devices.
- The findings support the use of Mn3Pt in thermoelectric devices with broad temperature applicability.
Keywords:
antiferromagnetismberry connection and curvaturcondensed matter physicsmagnetic fieldmagnetizationmaterials sciencenernst effectphysicsspintronicsMore Related Videos
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