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RESEARCH PRODUCT

Synthesis and Magnetic Properties of FePt@MnO Nano-heteroparticles

Tanja GrafTanja GrafWolfgang TremelThomas D. SchladtThomas D. SchladtRobert BranscheidMichael DietzschHeiko BauerUte KolbJörn MertinsOskar Köhler

subject

Materials scienceMagnetic domainCondensed matter physicsGeneral Chemical EngineeringNucleationNanoparticleGeneral ChemistryMagnetic hysteresisCondensed Matter::Materials ScienceFerromagnetismChemical physicsMaterials ChemistryAntiferromagnetismMagnetic nanoparticlesCondensed Matter::Strongly Correlated ElectronsHigh-resolution transmission electron microscopy

description

Monodisperse FePt@MnO nano-heteroparticles with different sizes and morphologies were prepared by a seed-mediated nucleation and growth technique. Both size and morphology of the individual domains could be controlled by adjustment of the synthetic parameters. As a consequence, different particle constructs, including dimers, dumbbell-like particles, and flowerlike particles, could be obtained by changing the polarity of the solvent. The FePt@MnO nano-heteroparticles were thoroughly characterized by high resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD) analyses and superconducting quantum interference device (SQUID) magnetometry. Due to a sufficient lattice match, the MnO nanoparticles (NPs) preferentially grow on the (111) surfaces of the fcc-FePt seeds. Furthermore, the surface spins of the antiferromagnetic MnO domains pin the magnetic moments of the ferromagnetic FePt NPs, which leads to an exchanged biased magnetic hysteresis.

yearjournalcountryeditionlanguage
2012-01-24Chemistry of Materials
https://doi.org/10.1021/cm2030685