XRD patterns of FeCo nanoparticles showing oxidation between (a) RT and and (b) 500 and for . Dark labels show FeCo peaks, light labels show peaks, and the underlined  label shows an FeO peak.
(a) An FeCo particle (oxidized at with an octagonal like projection [inset: simulated representation of a (110)-truncated cube using KRYSTALSHAPER™ software]. (b) An HRTEM of an FeCo particle (oxidized at ) showing ORs between it and its oxide and (c) low resolution image of the chaining of particles (oxidized at ).
(a) Heating rates of FeCo in PEO ferrofluids with powders of varying states of oxidation. While as-PT powders and those oxidized at powders show similar heating rates, powders oxidized at heat significantly slower. (b) Heating curves for ferrofluids with equal magnetization.
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