Tuning the metamagnetism of an antiferromagnetic metal

Abstract

We describe a `disordered local moment' (DLM) first-principles electronic structure theory which demonstrates that tricritical metamagnetism can arise in an antiferromagnetic metal due to the dependence of local moment interactions on the magnetisation state. Itinerant electrons can therefore play a defining role in metamagnetism in the absence of large magnetic anisotropy. Our model is used to accurately predict the temperature dependence of the metamagnetic critical fields in CoMnSi-based alloys, explaining the sensitivity of metamagnetism to Mn-Mn separations and compositional variations found previously. We thus provide a finite-temperature framework for modelling and predicting new metamagnets of interest in applications such as magnetic cooling.

arXiv comment12 pages, 5 figures

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• Ab initio theory of the Gibbs free energy and a hierarchy of local moment correlation functions in itinerant electron systems: The magnetism of Mn${}_3$A materials class
• Competing magnetic states, disorder, and the magnetic character of Fe3Ga4
• Electronic structure, metamagnetism and thermopower of LaSiFe${}_{12}$ and interstitially doped LaSiFe${}_{12}$
• Caloric effects around phase transitions in magnetic materials described by ab initio theory: The electronic glue and fluctuating local moments
• Coherent spin rotation-induced zero thermal expansion in MnCoSi-based spiral magnets