Spin fluctuation scattering of neutrons and the ferromagnetic state in iron

Abstract
The theory and practice of neutron diffuse reflexion which has been developed in earlier papers is here applied to the question: what theoretical model of ferromagnetism is most apposite in the case of iron? Experimental results on the response of diffusely reflected intensity to the magnetization of an iron crystal at room temperature and at 907 degrees K are interpreted as excluding the collective-electron representation, and indicating that the Heisenberg-type, localized-electron model is much closer to the truth. From the fit obtained between the observations and the predictions of the localized-electron model it is suggested that the magnetic electrons in iron vibrate under thermal agitation with measurably less than the nuclear amplitude.

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