Light-Switchable Exchange-Coupled Magnet

作者：Divya Rajan, John M. Cain, Tatiana V. Brinzari, Cauê F. Ferreira, Nicholas G. Rudawski, Ashley C. Felts, Mark W. Meisel, Daniel R. Talham · 发表于：ACS Applied Electronic Materials · 年份：2019 · DOI：10.1021/acsaelm.9b00520 · 被引用次数：2 · 研究领域：Magnetic properties of thin films、Magnetic Properties and Synthesis of Ferrites、Magnetic Properties of Alloys

A light-switchable hard magnet/soft magnet composite is described for which light irradiation breaks the exchange coupling between the two components. Heterostructure composites composed of nanometer scale particles of the hard magnet cobalt ferrite with the soft magnet manganese ferrite show a coherent response in magnetization versus applied field measurements, consistent with exchange coupling, which is disrupted upon illumination, causing an inflection at low fields corresponding to the soft magnet manganese ferrite. The light-induced decoupling of the exchange-coupled magnets can be attributed to the selective demagnetization at the surface of the ferrite nanoparticles, breaking the interferrite coupling.