Table 2.

Magnetic properties of iron oxides particles and NPs (Reproduced with permission from Teja, A.S. et al., Progress in Crystal Growth and Characterization of Materials; published by Elsevier Ltd., 2009. from ref [5]).

Iron Oxide	Hematite	Maghemite		Magnetite
Magnetic saturation	0.3 A.m2/kg	60–80 A.m2/kg		92–100 A.m2/kg
Curie Transition	~1000 K	~820–980 K		~850 K
Grain size	-	≥10 nm	≤10 nm	≥6 nm	≤6 nm
Magnetism ordering at room temperature	Ferromagnetic	Ferrimagnetic	SPM	Ferromagnetic	SPM