Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices.

Enhancement of perpendicular and parallel giant magnetoresistance with the number of bilayers in FeÕCr superlattices

We have correlated a detailed quantitative structural analysis by x-ray diffraction, transmission electron microscopy, and high spatial resolution electron energy-loss spectroscopy imaging, with the magnetization and anisotropic magnetotransport properties in sputtered Fe/Cr superlattices. To accomplish this, we developed a technique for magnetotransport measurements in metallic superlattices w...

Effect of sputtering pressure-induced roughness on the microstructure and the perpendicular giant magnetoresistance of FeÕCr superlattices

We have studied the connection between structure and magnetism of Fe/Cr superlattices as a function of sputtering pressure. To measure the perpendicular giant magnetoresistance, we have fabricated microstructured Fe/Cr pillars embedded in SiO2 and interconnected with Nb electrodes. Because of the uniform current distribution in the Nb electrodes and the minimization of the superlattice-electrod...

Polarized-neutron-reflectivity confirmation of 90° magnetic structure in Fe/Cr(001) superlattices

Effects of annealing on the magnetoresistance and structure of Fe/Cr(110) superlattices.

We have performed magnetotransport, magnetization, and structural experiments on sputtered Fe~30 Å!/Cr~12 Å! ~110! superlattices that were annealed at temperatures up to 400 °C. Interestingly, their giant magnetoresistance (Dr) is enhanced at intermediate temperatures, and strongly decreased at higher temperatures. If normalized to the antiferromagnetic coupling fraction of sample, the magnetor...

Exchange coupling , spin structure , and anisotropy properties in Co / Cr ( 001 ) superlattices

We have investigated by magneto-optic Kerr effect measurements the exchange coupling properties of Co/Cr(001) superlattices, which were grown by molecular beam epitaxial techniques. The Co thicknesses ranged from 5-30 Å and the Cr thicknesses from 9-50 Å. For Co thicknesses of about 10 Å and Cr thicknesses below 14 Å we observe an antiferromagnetic exchange coupling with near to perpendicular o...