Abstract
The results of an investigation on tensile stress dependence of mean Seebeck coefficient in Fe-based amorphous ribbons are presented, constituting a new Seebeck-sigma effect. A measurement test stand, capable of the determination of small variations in thermopower in such materials under stress is described. Exemplary results for commercially available, positively magnetostrictive SA1 and 2605CO amorphous ribbons show significant stress dependence with more than 1% of relative change, in contrast to negatively magnetostrictive 6030D alloys with 0.1% change. Non-ferromagnetic alloys are tested for comparison purposes, giving negligible results. Thus, the possibility of a magnetomechanical mechanism of the stress influence is proposed.
Highlights
Since the discovery of amorphous alloys, there is a massive amount of ongoing research devoted to their physical properties, as well as various effects enabling their utilization, mostly based on unique mechanical and magnetic properties [1,2,3,4,5,6,7]
Among the many magnetic-related phenomena, one of the more interesting, and relatively under-researched are the various magnetomechanical effects [8], with magnetostriction and inverse magnetomechanical (Villari) effects [9] as two main examples. These magnetomechanical effects can be measured with very high precision, e.g., by using piezo and optical [10,11,12] methods
Given that amorphous alloys magnetic properties can have significant stress sensitivity [19], this paper aims at presenting first results of tensile stress influence on the Seebeck coefficient in commercially-available Fe-based amorphous ribbons, constituting the Seebeck-sigma effect
Summary
Since the discovery of amorphous alloys, there is a massive amount of ongoing research devoted to their physical properties, as well as various effects enabling their utilization, mostly based on unique mechanical and magnetic properties [1,2,3,4,5,6,7]. Among the many magnetic-related phenomena, one of the more interesting, and relatively under-researched are the various magnetomechanical effects [8], with magnetostriction and inverse magnetomechanical (Villari) effects [9] as two main examples. The great list of magnetomechanical effects given by Williams [13] hints at “change of thermal EMF (electromotive force) due to magnetization” as another magnetomechanical effect. This is understandable, as the various electronic properties of metals are closely interconnected. Given that amorphous alloys magnetic properties can have significant stress sensitivity [19], this paper aims at presenting first results of tensile stress influence on the Seebeck coefficient in commercially-available Fe-based amorphous ribbons, constituting the Seebeck-sigma effect
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