Comparison of the magnetic behaviour between Co‐ and Ni‐nanostructures embedded in silicon matrices

Abstract

Auf kürzestem Wege gelang die Synthese des homogenen N‐verknüpften Glycopeptids 1 aus einem vollständig entschützten Glycosylamin und einem Asparaginsäure‐haltigen Peptid. Das Glycosylamin wurde durch Aminierung eines aus einem Glycal gebildeten freien Oligosaccharidhemiacetals erhalten.

Synthesis and Magnetic Characterization of Metal-filled Double-sided Porous Silicon Samples

“…In case of deposited Ni-particles, the anisotropy between the two magnetization directions is about 50%, whereas in case of Co particles of similar size and density of the spatial distribution, the anisotropy is in the range of only 10%. This indicates that the Ni particles strongly interact along the pores in contrast to the Co particles, which seem more or less uncoupled [ 5 ].…”

“…In this high field region up to an available field of 7 T, the samples show an enhancement of the magnetization with increasing magnetic field without saturation. This non-saturating magnetization term is observed independent of the shape of the embedded metal-structures [ 6 ]. Above the saturation magnetization of the incorporated metal, the magnetization measured at a certain field decreases with increasing temperature.…”

“…The temperature dependence of the high field term shows a paramagnetic-like behaviour and follows exactly the Curie–Weiss law. The non-saturating increase in the magnetization with the applied magnetic field is independent on the geometry of the deposited metal structures but strongly depends on the kind of deposited metal and is much less for Co than for Ni [ 6 ].…”

“…The electrolyte is composed of NiCl and NiSO 4 for Ni-deposition and of CoSO 4 for Co-deposition. To obtain a NiCo alloy, the Ni- and Co-salt solutions are mixed in the ratio 2:1 [ 5 ].…”