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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
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Robust longitudinal spin-Seebeck effect in Bi-YIG thin films.
Gene Siegel1, Megan Campbell Prestgard1, Shiang Teng1
1Nanostructured Materials Research Laboratory, Department of Materials Science and Engineering, University of Utah.
Scientific Reports
|March 22, 2014
Summary
This study confirms that spin-Seebeck effect (SSE) voltages in bismuth-doped yttrium iron garnet (Bi-YIG)/platinum films are purely thermoelectric. Magnon transport theory explains SSE, and pulsed-laser deposition enhances Bi-YIG film performance.
Area of Science:
- Spintronics
- Thermoelectric materials
- Condensed matter physics
Background:
- Bismuth-doped yttrium iron garnet (Bi-YIG) coupled with platinum is investigated for spin-current-driven thermoelectric coatings.
- These materials offer a pathway to convert waste heat into electricity, bridging spintronics and thermoelectric applications.
- Existing research questions the origin of the spin-Seebeck effect (SSE) and considers magnetic proximity effects in platinum.
Purpose of the Study:
- To provide evidence that observed voltages in Bi-YIG/Pt films originate purely from SSE.
- To reaffirm that magnon transport theory adequately explains SSE phenomena.
- To highlight the advantages of pulsed-laser deposition for fabricating Bi-YIG films with enhanced SSE performance.
Main Methods:
- Fabrication of Bi-YIG/Pt films using pulsed-laser deposition and solution-based methods.
- Measurement of spin-Seebeck effect voltages.
- Analysis of experimental data in the context of magnon transport theory.
Main Results:
- Voltages observed in Bi-YIG/Pt films are confirmed to be solely SSE voltages, not influenced by magnetic proximity effects.
- Magnon transport theory is validated as a sufficient explanation for the observed SSE behavior.
- Pulsed-laser deposited Bi-YIG films exhibit significantly larger SSE voltages, up to twice those of solution-processed films, even without an external magnetic field.
Conclusions:
- The spin-Seebeck effect in Bi-YIG/Pt heterostructures is a genuine thermoelectric phenomenon explained by magnon transport.
- Pulsed-laser deposition is a superior method for fabricating Bi-YIG films with high thermoelectric conversion efficiency.
- This research supports the development of advanced spintronic-thermoelectric devices for energy harvesting.
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