local density approximation calculations [@mazin2011n]. Therefore, it is important to determine whether magnetism in Fe-based materials arises from weakly correlated itinerant electrons [@mazin2011n], as in the case of the SDW in chromium [@fawcett], or whether it requires some degree of electron correlations [@HG], or if magnetism is dominated by the contributions of quasi-localized moments induced by incoherent electronic excitations [@qmsi09] such as in the AF insulating state of Cu oxides [@palee].

In this review, recent experimental and theoretical progress in the study of iron-based superconductors is summarized, with focus on the undoped parent compounds. In section II, the magnetically ordered states in nonsuperconducting iron pnictides, iron chalcogenides, and iron selenides are discussed. Section III describes the effect of electron and hole doping on static AF order and their associated spin excitations. In section IV, we provide several examples where deviations from the simple SDW FS nesting picture are prominent. Finally in section V, we present our perspective on the importance of electron correlations in these materials.

Magnetic order arrangements and spin waves in the parent compounds
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Although the overall crystal structures and chemical formulas of the copper-oxide superconductors can be quite different, their parent compounds are all AF Mott 