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Full-Text Articles in Physics
Magnetic And Electrical Properties Of Iron-Nickel-Chromium-Metalloid Glasses, H. Sadate-Akhavi, George C. Hadjipanayis, David J. Sellmyer
Magnetic And Electrical Properties Of Iron-Nickel-Chromium-Metalloid Glasses, H. Sadate-Akhavi, George C. Hadjipanayis, David J. Sellmyer
David Sellmyer Publications
The magnetic and electrical properties of amorphous (Fe1-xNix)78-yCrySi10B12 alloys have been measured between 4.2 and 300 K. Alloys with x≤0.9 and y=5 order ferromagnetically. High-field magnetization measurements show saturation in moderate fields suggesting a relatively high value of magnetic anisotropy which was estimated to be K≃106 erg/cm3. The magnetization at low temperatures follows a T3/2 law leading to a spin-wave stiffness coefficient D≃90 meV Å2. The x=1, y=5 alloy behaves like a "cluster glass" with a cluster ordering temperature around 20 …
Rare-Earth-Rich Metallic Glasses. I. Magnetic Hysteresis, George C. Hadjipanayis, David J. Sellmyer, B. Brandt
Rare-Earth-Rich Metallic Glasses. I. Magnetic Hysteresis, George C. Hadjipanayis, David J. Sellmyer, B. Brandt
David Sellmyer Publications
An anomalous magnetic behavior has been observed in rare-earch-rich metallic glasses of the composition (R75Au25)100-xBx where R denotes Pr, Gd, Tb, Er and x=0,10. The observed hysteresis in all samples except Gd at liquid-helium temperatures is due to the large anisotropy which develops below the ordering temperature. High-field-magnetization measurements up to 220 kOe were used to determine the spontaneous magnetization and the magnetic anisotropy constant which was found to be of order 108 erg/cm3 for the Tb and Er glasses. These parameters were used together with the observed remanence ratio to …
Rare-Earth-Rich Metallic Glasses. Ii. Magnetic Viscosity, George C. Hadjipanayis, David J. Sellmyer
Rare-Earth-Rich Metallic Glasses. Ii. Magnetic Viscosity, George C. Hadjipanayis, David J. Sellmyer
David Sellmyer Publications
Magnetic viscosity measurements on amorphous Tb75Au25 and (Er65Fe35)90B10 alloys are presented in the temperature range of 1.3 to 30 K. The magnetization in a steady magnetic field is found to follow a logarithmic time dependence for times up to 400 s suggesting a spectrum of activation energies. The magnetic viscosity parameters were used to investigate the temperature dependence of the observed large coercive fields and to study intrinsic temperature and thermal activation effects. It is found that the large change of the coercive field at very low temperatures is mainly …
Magnetic Properties Of Rare Earth-Gallium-Iron Glasses, S.G. Cornelison, David J. Sellmyer, George C. Hadjipanayis
Magnetic Properties Of Rare Earth-Gallium-Iron Glasses, S.G. Cornelison, David J. Sellmyer, George C. Hadjipanayis
David Sellmyer Publications
Results of magnetic susceptibility, high-field magnetization, and Mössbauer effect are reported for several R-Ga and R-Ga-Fe metallic glasses, where R = Pr and Tb. Magnetic ordering temperatures, effective moments, and coercive forces were determined. In certain cases the data indicate that the low temperature states of magnetic order are asperomagnetic or spin-glass-like. For (Pr80Ga20)80Fe20, several anomalies were observed including a large coercive field (45 kOe) at 100 K. Journal of Applied Physics is copyrighted by The American Institute of Physics.