Magnetic nanoparticles change their magnetic structure in a magnetic field

Nanowerk  July 27, 2020
Up to now, scientists assumed that magnetism in a nanoparticle is essentially limited to this core area. Using neutron scattering on cobalt ferrite nanoparticles an international team or researchers (France, Germany, Czech Republic) has shown that the applied magnetic field causes some of the previously disordered magnetic moments in the surface region to become aligned, and thus ordered in a way comparable to the magnetization in the core region. However, a residual area with differently aligned spins remains on the surface, which cannot be ordered by the applied magnetic field. Overall, the research showed that the extent of disorder in the spins in the particle surface influences the size of the magnetic particle core…read more. Open Access TECHNICAL ARTICLE

Schematic of the structural and field-dependent magnetic NP morphology…Credit: Phys. Rev. X 10, 031019, 24 July 2020

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