Philosophical Magazine B · 1978 · 282 citations · 7 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsMaterials PhysicsFerromagnetic MaterialsFerromagnetismMagnetic Properties Of SolidsMagnetism In SolidsMagnetization ProcessesPhase TransitionsInfinite ClusterMagnetic AlloysMagnetic PropertiesMagnetic ResonancePercolationSpin Glass BehaviorSpin GlassesTemperature Dependence
Au‑Fe alloys have been investigated via magnetic measurements across the composition range where ferromagnetism transitions from spin‑glass behavior. The study identifies a percolation threshold at 15.5 % Fe, finds that between 15.5 % and ~28 % Fe finite magnetic clusters coexist with the infinite cluster and freeze at a characteristic temperature, and reports magnetic resonance above ~13 % Fe with linewidth temperature dependence matching the magnetization behavior.
Abstract Au-Fe alloys have been studied by magnetic measurements of various types in the composition range where ferromagnetism evolves from spin-glass character. The percolation limit identified from the results and other data is 15.5 + 0.3 at.% Fe. Between this composition and ∼28% Fe, finite clusters co-exist in significant concentrations with the infinite cluster, and a fairly well-defined temperature observed in the magnetic properties is ascribed to a freezing of these clusters that parallels that of finite clusters in the pre-percolation alloys. Magnetic resonance is observed in alloys with more than about 13% Fe (i.e. in alloys containing large nearest-neighbour clusters) and the temperature dependence of the linewidth correlates with the interpretation given of the magnetization data.
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Spin glasses in low DC fields. II. Magnetic viscosity
C N Guy · Journal of Physics F Metal Physics · 1978 · 158 citations