Superweal ferrimagnetism arising from strong coupling in paramagnetic systems - Neumann, K.-U.; Lipinski, S.; Ziebeck, K.R.A. (Elsevier)
Alloys are considered which can be thought of as being composed of two strongly coupled paramagnetic subsystems. Using Landau theory it is shown that when a magnetic coupling of sufficient strength is switched on between the paramagnetic subsystems the whole system becomes unstable towards a magnetically ordered state. It is shown that for a positive coupling constant a ferrimagnetic state results with a small ferromagnetic moment. For small external magnetic fields the ferromagnetic component is only weakly field and temperature dependent. The relevance of this model for the interpretation of superweak ferrimagnetism recently observed in some Heusler alloys is briefly discussed.
http://linkinghub.elsevier.com/retrieve/pii/0038-1098(94)90782-X
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