Temperature dependence of magnetoresistance in Fe-Cr-Fe sandwiches

Abstract

Resistivity measurements have been performed as a function of temperature (1–300 K) and magnetic field (0–10 T) on antiferromagnetically coupled Fe-Cr-Fe sandwiches. Two types of samples were studied: MBE-grown sandwiches deposited epitaxially on the ZnSe (100) surface, and evaporated polycrystalline sandwiches deposited on glass substrates. The magnetic saturation field Hs determined from the resistivity ρ(H,T) is linear with temperature throughout the full temperature range for all samples. In the polycrystalline sandwiches, where the observed in-plane magnetic anisotropy is small, the linearity of Hs(T) implies that the antiferromagnetic interlayer exchange coupling A12 is also linear with temperature. The magnetoresistance of the sandwiches is constant at low temperature, and decreases linearly with increasing temperature above about 70 K.

The Magnetic Equation of State and Transport Properties in Reduced Dimensions

“…The numerical results show that the temperature behavior of M R is in qualitative agreement with the experimental results [21][22][23].…”

Giant magnetoresistance of Fe/In/Fe trilayers

“…The GMR for sample with In thickness t In = 2.4 nm is about 0.31% below near 50 K and decreases linearly above 50 K with increasing temperature. Chaiken et al [17] studied the temperature dependence of two AFM coupled Fe/Cr/Fe sandwiches. The GMR in Fe/Cr/Fe sandwiches was constant at low temperatures (<70 K) and decreased linearly with increasing temperature above about 70 K, which is similar to the temperature dependence of GMR of Fe/In/Fe trilayers.…”

Magnetic properties, interlayer exchange coupling and electric transport in Fe/Cr/Fe trilayers

“…Experimental data on the GMR in Fe/Cr multilayer systems seem to be extremely sensitive to the growth conditions (interface roughness) making not only the determination of the thickness dependence of the GMR di cult (Parkin et al 1990, Fullerton et al 1992, but also its actual value , Chaiken et al 1991, Obi et al 1992, Omi et al 1993, Colino et al 1996, Schad et al 1998) somewhat ambiguous. Typical measured resistivities at 4.2 K are quoted ) to be about 60 m cm for a Fe m Cr n ‰ Š bilayer thickness around 30 A Ê ; for comparison see our calculated values in ®gure 10.…”

“…Introduction Fe/Cr multilayer systems have attached much experimental (Baibich et al 1988, Krebs et al 1989, Barnas et al 1990, Parkin et al 1990, Baumgart et al 1991, Chaiken et al 1991, Petro et al 1991, Purcell et al 1991, Unguris et al 1991, Fullerton et al 1992, Gijs and Okada 1992a, Jacob et al 1992, Kamijo and Igarashi 1992, Miyazaki et al 1992, Obi et al 1992, Gijs et al 1993, Hosoito et al 1993, Omi et al 1993, Parkin and York 1993, Hahn et al 1994, Potter et al 1994, Schad et al 1994a,b, 1995,b, 1998, Colino et al 1996, Ho and Petford-Long 1996, Rensing et al 1996, Ueda et al 1996, Ustinov et al 1996a,b, Heinrich et al 1999, Ito et al 1999, Pierce et al 1999 and theoretical interest (Levy et al 1990, Levy 1991, Zhang et al 1992, Stoe‚er and Gautier 1993, Mertig et al 1995, Mirbt et al 1996, Tsymbal and Pettifor 1996, Mathon 1997, Fishman 1998, ...…”