Hall resistivity of a magnetic amorphous alloy : Effects of thermal cycling and annealing

• We have studied the effects of thermal cycling and annealing on the Hall resistivity ρH and electrical resistivity ρ of an amorphous magnetic material, Metglas 2826A. Thermal cycling up to 600 K has no significant effect on ρ but changes ρH, especially at T > 300 K. Annealing at higher temperatures Ta affects ρH more strongly than it influences ρ. For Ta = 650 K the Curie temperature jumps by ∼ 300 K and this, combined with X-ray data, is regarded as being symptomatic of the onset of crystallization. It is demonstrated that, for a fixed T, the variation of the extraordinary Hall coefficient R1 is simple correlated with that of ρ for both the amorphous material and the annealed (crystallized) specimens. Furthermore, for a given Ta, the variations of R1 and ρ as functions of temperature exhibit the same formal relationship. The temperature dependence of ρ in the annealed specimens is rendered plausible in terms of recent theories of disordered materials. Room-temperature studies of electron spin resonance and the field dependence of the magnetization are also reported.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Amorphous metal

Metglas 2826A

Hall resistivity

crystallization

ESR

magnetization

extraordinary Hall coefficient

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