Fabrication of Magnetic FePt Patterns from Langmuir–Blodgett Films of Platinum–Iron Oxide Core–Shell Nanoparticles

The patterned Langmuir–Blodgett (pLB) technique has been used to generate micrometer-sized structures of Pt@Fe2O3 core–shell nanoparticles. The composition of these core–shell nanoparticles has been further converted in situ into face-centered tetragonal phase FePt, one of the best candidates for ultra-high-density magnetic-storage media without loss of the pattern (see Figure).