Spintronik: eine Herausforderung für Materialwissenschaften und Festkörperchemie

Abstract

Spintronik ist ein multidisziplinäres Forschungsfeld zwischen Physik, Material- und Ingenieurwissenschaften, aber auch ein neuer Forschungsbereich der Festkörperforschung. Für die verschiedensten Anforderungen müssen unterschiedlichste Materialien gefunden werden. Die Suche nach ferromagnetischen Halbleitern und stabilen halbmetallischen Ferromagneten mit Curie-Temperaturen höher als Raumtemperatur ist immer noch eine zentrale Aufgabe für die Festkörperchemie. Ein allgemeines Verständnis der Struktur-Eigenschafts-Beziehungen ist eine notwendige Voraussetzung für das Design neuer Materialien. In diesem Aufsatz werden die wichtigsten Entwicklungen im Bereich der Spintronik aus der Perspektive des Materialwissenschaftlers dargestellt

A25Mg,89Y and115In solid state MAS NMR study of YT2X and Y(T0.5T′0.5)2X (T/T′ = Pd, Ag, Au; X = Mg, In) Heusler phases

“…The compositional variety leads to manifold interesting physical properties: ferromagnetism, superconductivity, enhanced thermoelectric properties, giant magneto-resistance, and topological insulator behavior have been reported. [4][5][6][7][8][9] The different properties of Heusler phases have been reviewed. 10,11 An important parameter for varying the diverse physical properties is the valence electron count (VEC).…”

Zinc‐Diluted Magnetic Metal Formate Perovskites: Synthesis, Structures, and Magnetism of [CH3NH3][MnxZn1−x(HCOO)3] (x=0–1)

“…[1][2][3][4][5][6][7][8][9] In such systems, the magnetic components are replaced or diluted by nonmagnetic components in increasing amounts, which gradually interrupt the coupling or interaction between the magnetic sites, thus leading to the change and evolution of the magnetic structures and properties. [1][2][3][4][5][6][7][8][9] In such systems, the magnetic components are replaced or diluted by nonmagnetic components in increasing amounts, which gradually interrupt the coupling or interaction between the magnetic sites, thus leading to the change and evolution of the magnetic structures and properties.…”

Quaternary Heusler Compounds without Inversion Symmetry: CoFe1+xTi1–xAl and CoMn1+xV1–xAl

“…This indicates that the lattice parameter is dominated by the Co-Fe and Co-Mn sublattice interaction rather than interaction between the transition metal and main group element. The magnetic moment (m) of many Heusler compounds, especially the Co 2 -based half-metallic ferromagnets, [8,17] follows the Slater-Pauling rule where there is an average magnetic moment (in multiples of the Bohr magneton, μ B ) per atom for localized moment systems according to Equation (1).…”

“…[4,5] More recently they have attracted great interest, because they have been predicted to be half-metallic ferromagnets. [6,7] Today Heusler compounds are used for various applications in spintronics, [8] thermoelectrics, [9,10] and superconductors. [11] In this work, the properties of the solid solutions CoFe 1+x Ti 1-x Al and CoMn 1+x V 1-x Al have been investigated.…”