Magnetic property of FePt nanoparticles encaged in carbon nanotubes

► The FePt nanoparticles were successfully encaged in CNT tips. ► The FePt nanoparticles were single crystal, and were in L10 phase. ► The coercivity of L10 FePt nanoparticles was estimated to be 11.3 kOe (902 kA/m).