Abstract
An elaborate in-field critical behaviour study based on magnetic isotherms measured in the vicinity of ordering temperature of a polycrystalline cubic β-Mn type Co7Zn7Mn6 alloy is presented. The Rhodes-Wohlfarth analysis suggests the itinerant character of this chiral magnet. The critical exponents β, γ and δ for spontaneous magnetization, initial magnetic susceptibility and critical M-H isotherm, respectively are evaluated through the modified Arrott plots, Kouvel–Fisher method and critical isotherm analysis. The estimated critical exponents β = 0.382(1), γ = 1.386(2) and δ = 4.628(1) corroborate that the critical behaviour of the Co7Zn7Mn6 system is akin to that of a three-dimensional (3D) Heisenberg ferromagnet. Based on the renormalization group theory predictions, the magnetic moments in the Co7Zn7Mn6 chiral magnet are found to interact through the attractive extended-type short-range interactions between spins.
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