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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Magnetics and the Critical Materials Challenge: An FMD Symposium Honoring Matthew J. Kramer
Presentation Title Synthesis and Stabilization of Magnetic Nanoparticles of Rare-earth Metal Alloys
Author(s) Shouheng Sun
On-Site Speaker (Planned) Shouheng Sun
Abstract Scope We report our recent studies on the synthesis and stabilization of strongly ferromagnetic NPs of REM alloys of SmCo and SmFeN. Our synthesis started with the preparation of composite NPs of CoO + Sm2O3 (denoted as SmCo-O) within one nanostructure. These SmCo-O NPs were then coated with polydopamine (PDA) and thermally annealed to convert the PDA to N-doped graphitic carbon (NGC). The SmCo-O/NGC NPs were further reduced by Ca at 850C to give SmCo5/NGC NPs. The 10 nm NGC coating efficiently stabilized the SmCo5 NPs against air oxidation: the magnetic moment of the 180 nm SmCo5/NGC NPs was stabilized at 86.1 emu/g after their air exposure at room temperature for five days, and their Hc reached 51 kOe at 150 K and 22 kOe at 330 K. The method could be easily extended to synthesize Sm2Co17 NPs and Sm2Fe17N3 NPs.
Proceedings Inclusion? Planned:
Keywords Magnetic Materials, Nanotechnology, Surface Modification and Coatings


A Solution to the Permalloy Problem
Challenges in Affordable, Reliable Permanent Magnets
Controlling First-order Magnetic Phase Transitions in Rare-earth Intermetallics
Critical Materials Challenges in ThMn12-type Hard Magnetic Alloys for Permanent Magnets
Developing Substitutes for Magnetic Alloys
Far-from-equilibrium Materials Processing
From High-throughput Synchrotron Diffraction to Closed-loop Autonomous Materials Discovery
Giant Saturation Magnetization of Fe-based Soft Magnetic Amorphous Alloy by Introducing Nitrogen
HDDR Treatment on Nd2Fe14B-based Magnets in the Presence of an Applied Magnetic Field
Iron Nitride: a Non-rare-earth Containing Permanent Magnet
Like Poles Attraction and Unlike Poles Repulsion - Science Behind the Mystery
Magnetoelastic Interactions Reduce Hysteresis in Soft Magnets
Mechanically Strengthened Heterogeneous Sm-Co Sintered Magnets
Microstructural Evolutions, Phase Transformations and Hard Magnetic Properties in Polycrystalline Ce-Co-Fe-Cu Alloys
Nanocomposite Soft Magnetics: Applications, State-of-art, and Emerging Trends
Structure and Magnetic Properties of Galfenol Nanocomposite Alloys
Synthesis and Characterization of Rare-earth-based Metallic Glasses
Synthesis and Stabilization of Magnetic Nanoparticles of Rare-earth Metal Alloys
Utilizing High Energy X-rays to Perform In Situ observations of Alnico Spinodal Evolution

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