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Magnetic Relaxation In Fe-(Sio2) Granular Films, Gang Xiao, Sy_Hwang Liou, A. Levy, J.N. Taylor, C. L. Chien
Magnetic Relaxation In Fe-(Sio2) Granular Films, Gang Xiao, Sy_Hwang Liou, A. Levy, J.N. Taylor, C. L. Chien
Sy-Hwang Liou Publications
Magnetic relaxation of granular Fe-(SiO2) solids with low metal-volume fraction has been studied by employing dc SQUID (superconducting quantum interference device) magnetometry and Mössbauer spectroscopy with the characteristic measuring time differing by nine orders of magnitude. The blocking temperatures (TB), extrapolated to zero external field as measured by the two techniques maintain a constant ratio of 0.35 independent of samples. Arrhenius law was found adequate in describing the relaxation process, with a well-defined relaxation-time constant of τ0≃10-13 sec. A cusp in the susceptibility is observed at TB, below which irreversible difference …
Magnetic Properties Of FeXCu100-X Solid Solutions, C.L. Chien, Sy_Hwang Liou, D. Kofalt, Wu Yu, T. Egami, Thomas J. Watson, T.R. Mcguire
Magnetic Properties Of FeXCu100-X Solid Solutions, C.L. Chien, Sy_Hwang Liou, D. Kofalt, Wu Yu, T. Egami, Thomas J. Watson, T.R. Mcguire
Sy-Hwang Liou Publications
In the equilibrium states, the solid solubility between Fe and Cu is negligibly small. Using vapor deposition, however, we produced FexCu100-x solid solutions over the entire composition range. All the samples were crystalline: bcc structure at the Fe-rich side and fcc structure at the Cu-rich side. The transition from bcc to fcc occurred at around x=70, where the two phases were found to coexist. The fcc alloys exhibit a magnetic dilution leading to a magnetic percolation threshold at xc≃18, rarely seen in binary Fe alloys. Below xc, only spin-glass-like ordering is …