Magnetothermopower of Fe / Cr superlattices
Abstract
We report magnetothermopower S( H) measurements at room temperature for sputtered [Fe(32 Å) / Cr( x)] 30 superlattices with x ≈ 5-50 Å. The thermopower in zero field S( H = 0) appears to extrapolate to the known values for Fe and Cr in the x = 0 and large- x limits, respectively, and drops below these values at intermediate x. S follows the same trend with H and x as the magnetoresistance (MR), which shows oscillatory behavior as a function of x, and large field effects for antiferromagnetic Fe interlayer couplings. Both S( H) and the MR saturate when the applied field aligns the magnetization of the Fe-layers parallel to each other, but the thermopower is enhanced by application of a magnetic field, while the resistivity decreases, in accord with expectation.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- December 1991
- DOI:
- 10.1016/0304-8853(91)90255-9
- Bibcode:
- 1991JMMM..102L...5C