Showing papers by "Albert Fert published in 1991"
TL;DR: In this article, the magnetic and magneto-transport properties of Co/Cu multilayers prepared by sputtering were studied and a giant magnetoresistance was observed in the half-periods with antiferromagnetic interlayer coupling.
496 citations
TL;DR: It is found that oscillations of the interlayer coupling as a function of the Cu thickness with the same long period as in Co/Cu multilayers have almost exactly opposite phases.
Abstract: We have studied the magnetic and magnetotransport properties of Fe/Cu multilayers prepared by sputtering. We find oscillations of the interlayer coupling as a function of the Cu thickness with the same long period as in Co/Cu multilayers (around 12.5 \AA{}). The most striking result is that the oscillations in Fe/Cu and Co/Cu have almost exactly opposite phases. A large magnetoresistance of the spin-valve type is observed in the half periods with antiferromagnetic interlayer exchange. However, the magnetoresistance in Fe/Cu is definitely smaller than in Co/Cu.
164 citations
TL;DR: In this paper, the role of the main parameters involved in the giant magnetoresistance: thicknesses, interface roughness and temperature were discussed, and new experimental data on Fe(001)/Cr(001) superlattices were discussed.
120 citations
TL;DR: Magnetoresistance measurements have been made on sputtered multilayerd films of Ag/Co and Cu/Co as discussed by the authors, where magnetoresistances as high as 16% at 4.2 K have been measured in the field range where the magnetization reverses.
31 citations
TL;DR: In this paper, the authors used self-consistent total energy supercell band calculations to study the electronic structure of b.c. Fe/Cr magnetic multilayers and found that, for n layers of Cr sandwiches between three layers of Fe, alternate Fe layers prefer ferromagnetic order for n = 3 and antiferromagnetic ordering for N = 4, 5, 6, and 7.
Abstract: We use self-consistent total-energy supercell band calculations to study the electronic structure of b.c.c. Fe/Cr magnetic multilayers. We find that, for n layers of Cr sandwiches between three layers of Fe, alternate Fe layers prefer ferromagnetic order for n = 3 and antiferromagnetic order for n = 4, 5, 6, and 7. The magnetic coupling is shown to result from an interplay between direct "d-d" hybridization of Fe and Cr atoms, and indirect exchange coupling through the "sp" electrons.
20 citations
TL;DR: In this paper, the authors measured the hysteresis cycles in an AC magnetic field for an YBaCuO single crystal with applied field perpendicular to the c-axis and showed that the losses have, for a given amplitude, a maximum for a temperature Tm.
Abstract: Hysteresis cycles in an AC magnetic field are measured for an YBaCuO single crystal with applied field perpendicular to the c-axis. The hysteresis losses are studied as a function of field frequency (0.5 Hz to 100 Hz), field amplitude (0 to 250 Oe) and temperature (4.2 K to 100 K). It is shown that the losses have, for a given amplitude, a maximum for a temperature Tm. This maximum corresponds to the full field penetration in the sample and depends strongly on the frequency. We observe a shift of the maximum in the order of 2 K per frequency decade. For T>Tm, the losses increase noticeably with frequency. Instead of a power law behaviour like W∝f 1 2 , predicted by Tackacs model in the case of large viscous forces, a logarithmic dependence of the losses with frequency is observed; this result may be understood using a TAFF model.
11 citations
TL;DR: In this article, the effects of the interface on the magnetic anisotropy of these materials are reported and a large interface anisotropic is found but it is somewhat smaller than that estimated from a point-charge model assuming a sharp interface.
Abstract: Dy80Ni20/Mo multilayers have been prepared by sputtering and the effects of the interface on the magnetic anisotropy of these materials are reported. A large interface anisotropy is found but it is somewhat smaller than that estimated from a point‐charge model assuming a sharp interface.
7 citations
TL;DR: In this paper, the Hall effect measurements on disordered Ce(Cu x Ga 1-x ) 5 Kondo alloys (x = 0.8 and 0.6) in the temperature interval 0.1 to 200 K and in magnetic fields up to 7 T were presented.
Abstract: We present Hall effect measurements on disordered Ce(Cu x Ga 1- x ) 5 Kondo alloys ( x = 0.8 and 0.6) in the temperature interval 0.1 to 200 K and in magnetic fields up to 7 T. We observe a continuous increase of the Hall constant R H ( T ) at low temperatures, which is typical of incoherent Kondo systems. In CeCu 4 Ga, R H ( T ) exhibits also a weak maximum at ∼0.3 K. Above the Kondo temperature, R H ( T ) is well described by a single impurity skew scattering model. In addition, magnetoresistivity data for CeCu 4 Ga ( T > 0.2 K ) are presented, showing different behaviour for temperatures below and above 2 K.
4 citations