ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Results are reported on the magnetothermopower of antiferromagnetically coupled Co-Re superlattices, obtained in a film of 150 A(ring) Re/(Co 22 A(ring) Re 5 A(ring))×16/50 A(ring)Re, from 10 to 300 K and in magnetic fields 0〈H〈10 kOe. At low temperature the magnetothermopower, ΔS=S(H)−S(0), is positive reaching a maximum around 100 K (ΔS/S(approximately-equal-to)10% at saturation), and fading away when T(approximately-greater-than)250 K. At each temperature, the field dependence of ΔS is rather close to that observed in the magnetoresistance. The temperature dependence of ΔS is consistent with the model of Piraux et al. [J. Magn. Magn. Mater. 110, L247 (1992)] based on a two-spin-channel conduction with electron spin mixing due to magnon scattering (ρ↑↓). In this model the sign of ΔS depends on whether the parameter α=ρ0↓/ρ0↑ is greater (ΔS〈0) or smaller than unity (ΔS(approximately-greater-than)0). The results for Co-Re superlattices, showing ΔS(approximately-greater-than)0, support this prediction, since α〈1 for Re impurities in Co, from previous studies.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.356945
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