Articles you may be interested inMagnetic anisotropy and order structure of L10-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO3, and MgAl2O4 substrates Magnetism and magnetotransport in symmetry matched spinels: Fe3O4/MgAl2O4
The Raman spectra of the system NiSz -&e, are investigated for z = 0. OO,0.10,0.20,0.30, and 0.55, at room temperature and at temperatures below the point where the z = 0.55 sample suffers a resistivity change from semiconducting ( T 2 120 K) to metallic ( ! I ' 5 120 K). No qualitative or anomalous quantitative changes in the spectrum of the sample are found that could be associated with the anomaly in its transport properties. A mode of A, symmetry appears in the alloys which is absent from the spectrum of pure Xis,. This mode is successfully explained in terms of vibrations of S-Se pairs. Other modes decrease in frequency with increasing 'selenium concentration, a trend easily understood considering the increase in the unit cell volume with increasing z. Die Ramen-Spektren des Systems NiSs-Jh, (z = 0,OO; 0,lO; 020; 0,30 und 0,55) werden bei Zimmertemperatur und bei Temperaturen unterhalb des Punktes untersucht, wo die Probe mit z = 0,55 eine Widerstandsiinderung von halbleitend (T 2 120 K) zu metallisch ( T 120 K) zeigt. Es wird keine qualitative oder anomale quantitative Anderung im Spektrum der Probe gefunden, die mit der h o m a l i e in ihren Transporteigenschaften verkniipft werden kann. EineMode der Ag-Symmetrie in den Legierungen tritt 8 U f , die im Spektrum des reinen NiS, fehlt. Diese Mode liiI3t sich erfolgreich mit Schwingungen der SSe-Paare erklzren. Die Frequenzen an-dererModen nehmen mit steigender Selenkonzentration ab ; ein Trend der sich durch Beriicksichtigung der VergraSerung des Volumens der Einheitszelle mit steigendem z leicht erklaren liiI3t.
A calculation of the local density of spin-wave states in a dilute ferromagnet is presented. It is based on a Green's-function formulation solved within the cluster -Bethe-lattice approximation. The method is compared with an exact solution for the one-dimensional dilute ferromagnet. We also study clusters of nine atoms in the bcc structure, and clusters of 7, 19, and 27 atoms in the simple-cubic structure. Our study shows: (i) a stability condition for ferromagnetism in agreement with percolation theory; (ii) a local structure dependence of the spin-wave structure; (iii) the existence of localized spin-wave states due to both isolated magnetic clusters and nonpropagating magnon modes.
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