The influence of organic ligands on the saturation magnetization (MS) of chemically disordered face-centered-cubic (fcc) FePt nanoparticles (NPs) was investigated. By increasing the basicity and/or surface coverage of ligands, the MS of fcc-phase FePt NPs decreases due to an increase in electron donation from the ligand to the Fe d bands. FePt NPs capped with 1-octanethiol or 1-dodecanethiol show larger MS than as-synthesized NPs capped with oleic acid due to a thinning of the nonmagnetic shell.
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Tanaka et al. (2008) studied this question.
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