Stress Dependence of Seebeck Coefficient in Iron-Based Amorphous Ribbons.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Physics

Background:

• The Seebeck coefficient is a crucial thermoelectric property.
• Amorphous magnetic alloys offer unique physical properties.
• Understanding stress effects on thermoelectricity is vital for sensor applications.

Purpose of the Study:

• To investigate the tensile stress dependence of the Seebeck coefficient in Fe-based amorphous ribbons.
• To identify and characterize a novel Seebeck-sigma effect.
• To explore potential mechanisms behind stress-induced thermoelectric changes.

Main Methods:

• Development of a specialized test stand for precise thermopower measurement under stress.
• Experimental investigation of various Fe-based amorphous ribbons (positively and negatively magnetostrictive) and non-ferromagnetic alloys.
• Analysis of relative changes in the Seebeck coefficient as a function of applied tensile stress.

Main Results:

• Demonstrated a significant stress dependence of the mean Seebeck coefficient in Fe-based amorphous ribbons, termed the Seebeck-sigma effect.
• Observed over 1% relative change in positively magnetostrictive SA1 and 2605CO alloys.
• Reported minimal changes (0.1%) in negatively magnetostrictive 6030D alloys and negligible effects in non-ferromagnetic materials.

Conclusions:

• The Seebeck-sigma effect is a notable phenomenon in Fe-based amorphous ribbons.
• The significant stress dependence in magnetostrictive alloys suggests a magnetomechanical mechanism.
• This finding opens avenues for stress-sensing applications using thermoelectric materials.