The first-and second-order magnetocrystalline anisotropy constants, K x and K 2 , of EuS were measured by a ferromagnetic resonance technique. The measurements were performed at 21.48 GHz and 1.35°K, and the sample was a small, highly polished strain-free single-crystal sphere, oriented so that the (110) plane contained both the rf and static magnetic fields. The linewidth was of order 10 Oe, the narrowest observed in a chalcogenide of europium and indicates the degree of perfection and purity of the sample. Ki/M and K2/M (where M is the saturation magnetization) were determined to be -19.6dbl.O and -4.6±0.3 Oe, respectively. The cubic crystal-field splitting parameters 64 and h were calculated on the basis of Wolf's single-ion mechanism, and were determined to be (0,268±0.014) X 10~4 and (-0.019±0.09) X 10~4 cm" 1 , respectively. The results are compared with the behavior of the Eu + + ion in cubic host lattices.
The order-disorder transformation in the alloy Cu3Au has been studied at pressures ranging up to 21 kbar by means of electrical-resistance measurements made while the sample is at high temperature and under pressure. The rate of change of the critical temperature with pressure is 2.1°K/kbar from 7 to 21 kbar. The kinetics of the order transformation below Tc are adequately described by the homogeneous reaction rate equation and an activation volume of 6.8 cm3/mole of atoms. The magnitude of this activation volume indicates that the formation of vacancies on the gold sublattice is the rate-limiting step in the homogeneous ordering process.
Temperature dependence of the fluorescence of Eu 3+ -ion doped in various silicate glasses J. Appl. Phys. 91, 9466 (2002); 10.1063/1.1476962 Frequency dependence of the ferromagnetic resonance linewidth of barium ferriteThe temperature dependence of the ferromagnetic resonance linewidth of highly polished single-crystal spheres of EuS was measured in the range from 2.2° to 30 0 K, using standard microwave techniques at a frequency of 22.65 GHz. The linewidth increases from ",5 Oe at 2.2°K to ",400 Oe at the Curie point, and continues to increase in the paramagnetic range to a value of 1000 Oe at 78°K. The linewidth varies linearly with reciprocal magnetization from 2.2° to 18°K, as predicted by the Landau-Lifshitz equation and can be characterized by a temperature-independent microphysical damping constant, 'ii, equal to 1.9±0.09X 10' rad/sec within this temperature range.
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