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Giant spin Seebeck effect in a non-magnetic material
C M Jaworski1, R C Myers, E Johnston-Halperin
1Department of Mechanical Engineering, The Ohio State University, Columbus, Ohio 43210, USA.
Nature
|July 13, 2012
Summary
Researchers discovered a giant spin Seebeck effect in indium antimonide (InSb) semiconductors, generating voltage signals three orders of magnitude larger than previously observed. This finding opens new avenues for thermoelectric energy conversion using spin currents.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Thermoelectrics
Background:
- The spin Seebeck effect generates voltage from thermal gradients in magnetic materials.
- Previous observations yielded microvolt-per-kelvin signals in various materials.
- Indium antimonide (InSb) is a non-magnetic semiconductor with strong spin-orbit coupling.
Purpose of the Study:
- To investigate an unusually large spin Seebeck effect signal in InSb.
- To understand the underlying physical mechanisms responsible for the enhanced signal.
- To explore the potential of this phenomenon for novel thermoelectric applications.
Main Methods:
- Applying thermal gradients to InSb under quantizing magnetic fields.
- Measuring the generated transverse spin current and converted voltage.
- Analyzing the role of Zeeman splitting, spin-orbit coupling, and phonon-electron drag.
Main Results:
- Observed a giant spin Seebeck effect in InSb with millivolt-per-kelvin magnitudes.
- Demonstrated that Zeeman splitting and spin-orbit coupling amplify the spin polarization.
- Proposed phonon-electron drag as the mediating mechanism for the enhanced voltage.
Conclusions:
- The giant spin Seebeck effect in InSb is significantly larger than conventional spin Seebeck effects.
- Strong spin-orbit coupling and phonon-electron interactions are crucial for this phenomenon.
- This discovery offers a promising pathway for highly efficient spin-based thermoelectric devices.
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