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FePt magnetic nanoparticle systems are an excellent candidate for ultrahigh-density magnetic recording. Monodis-N2 atmosphere. Transmission electron microscopy (TEM) images show monosize FePt nanoparticles with diame-ter of 4 nm and a standard deviation of about 10%. The average distance between monodispesre particles is nearly 3 nm, and oleic acid and oleylamine surround the nanoparticles as surfaetants. Stability investigation of nanopar-tide colloidal solution is done via spectrophotometery analysis. The results for FePt nanoparticles dispersed in hexane indicate that adding surfactants with concentration of 3 × 10-3 part by volume for centrifugation stage increases the stability of FePt nanopartieles solution with concentration of 16 mg/mL, about 67%.