Optical Manipulation of Magnetism in Iron Oxide Nanoparticles
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Optical Manipulation of Magnetism in Iron Oxide Nanoparticles

Magnetization of iron oxide nanoparticles is optically modulated by the interaction between excitons and atomic spins. This interaction reduces the energy barrier (from black to red) and facilitated an optically-driven conversion from ferrimagnetism to superparamagnetism (top-right).  (hi-res image)

Studies of light-induced magnetization changes in iron oxide nanoparticles show a transition from ferrimagnetic to superparamagnetic.

S. He, J. S. DuChene, J. Qiu, A. A. Puretzky, Z. Gai, and W. D. Wei, “Persistent photomagnetism in superparamagnetic iron oxide nanoparticles,” Advanced Electronic Materials (2018). DOI: 10.1002/aelm.201700661R2