The main goal of this work is to study the critical behavior in the as-quenched and annealed NANOPERM Fe75Mo8Cu1B16 alloy in the vicinity of the critical temperature TC The second order phase transition from ferro- to paramagnetic state was confirmed by the positive slope of Arrott plots The critical exponents (β, γ, and δ) have been revealed using the Kouvel-Fisher method Moreover, the Kouvel-Fisher analysis revealed the detailed Curie temperature for all investigated samples

Investigation of critical behavior in the vicinity of ferromagnetic to paramagnetic phase transition in the Fe75Mo8Cu1B16 alloy

H E Stanley Oxford: University Press 1971 pp xx + 308 price ?5 In the past fifteen years or so there has been a lot of experimental and theoretical work on the nature of critical phenomena in the neighbourhood of second order phase transitions. It has not been easy to get a good overall view of this work without digging through the rather complex original literature, although there are some good review articles covering particular aspects of the work.

https://iopscience.iop.org/article/10.1088/0031-9112/23/4/018/pdf

Introduction to Phase Transitions and Critical Phenomena

We have studied the magnetic properties of two amorphous alloy ribbons Fe72Cr6Si4Nb5B12Ag1 (FCSNB-Ag) and Fe72Cr6Si4Nb5B12Cu1 (FCSNB-Cu), prepared by using a melt-spinning technique. Magnetization (M ) measurements for various temperatures (T ) and magnetic fields (H) indicate that ferromagnetic-paramagnetic (FM-PM) phase transitions take place in FCSNB-Ag and FCSNB-Cu at Curie temperatures (TC ) of about 308.3 K and 322.5 K, respectively. Analyses of M − H data at different temperatures in the vicinity of the FM-PM phase transition based on the modified Arrott plot method and scaling hypothesis yielded the exponent values of β = 0.369 ± 0.005, γ = 1.359 ± 0.005 and δ =4 .7± 0.1 for FCSNB-Ag, and β = 0.376 ± 0.002, γ = 1.315 ± 0.006 and δ =4 .5± 0.1 for FCSNB-Cu. Compared with the values from theoretical models, these values are close to those expected for the 3D Heisenberg model, demonstrating the existence of short-range FM order in the amorphous alloy ribbons.

/pdf/short-range-ferromagnetism-in-alloy-ribbons-of-fe-cr-si-nb-12rwbh9ptu.pdf

Short-range ferromagnetism in alloy ribbons of Fe-Cr-Si-Nb-(Ag, Cu)

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Short-range ferromagnetism in alloy ribbons of Fe-Cr-Si-Nb-(Ag, Cu)