Magnetic Properties of Alloy Nanoparticles
Summary
Alloy nanoparticles combine two or more metallic elements at the nanoscale to yield magnetic properties that diverge markedly from their bulk counterparts. Atomistic mixing of transition metals such as Fe, Co and Ni with noble metals like Pt or Pd modifies the balance between itinerant and localised magnetism, tailoring magnetic moments, anisotropy and coercivity. Reduced dimensions introduce superparamagnetic behaviour above a critical blocking temperature, while surface atoms contribute a significant fraction of total magnetisation, enhancing magnetic susceptibility and exchange bias phenomena. Ordered intermetallic phases (for example L10 and L12) often exhibit elevated magnetocrystalline anisotropy, improving thermal stability and data‐storage density. Synthetic advances—including colloidal synthesis, templated growth and galvanic replacement—enable control over size, shape, composition and crystal structure, facilitating systematic exploration of how lattice symmetry, electronic structure and interfacial strain influence magnetic relaxation and switching dynamics. These materials hold promise for high‐performance permanent magnets, high‐resolution magnetic imaging, targeted hyperthermia treatment and spintronic devices, provided that challenges in interparticle coupling, oxidation resistance and large‐scale fabrication can be overcome.
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Magnetic Properties of Alloy Nanoparticles publication trend
The graph below shows the total number of articles in magnetic properties of alloy nanoparticles across all publications each year (not limited to Nature Index journals).
Technical terms
Superparamagnetism: A form of magnetism in nanoparticles where thermal fluctuations randomise the orientation of magnetic moments in the absence of an external field.
L10 and L12 phases: Ordered intermetallic crystal structures exhibiting distinct atomic arrangements that strongly influence magnetic anisotropy and coercivity.
d‐band centre: The energy centroid of the metal d‐electron density of states relative to the Fermi level, influencing magnetic exchange interactions and surface reactivity.
References
- The Magnetic Band-Structures of Ordered PtxFe1−x, PtxCo1−x, and PtxNi1−x (x = 0.25, 0.50, and 0.75). Magnetochemistry (2020).
- Hydrogen Adsorption on Ordered and Disordered Pt–Fe and Pt–Co Alloys. The Journal of Physical Chemistry C (2024).
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