Understanding the ferromagnetic behavior of coupled magnetic nanoparticles (NPs) in a chain structure, called a nanochain (NC), will open up new routes for its practical use. Here, we report the magnetization reversal modes in isolated magnetite (Fe3O4) NPs with diameters of 100 and 200 nm, as well as those of one-dimensional (1D) self-assembled NCs consisting of these NPs. NCs consisting of 100-nm diameter NPs switched through a transverse domain wall-like motion. Meanwhile, in 200-nm diameter NPs and NCs, we observed 3D magnetic vortex states that were more energetically favorable than single domain or multidomain states.
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Acknowledgments This work was supported by the National Research Foundation of Korea (2013K2A1A7076318, 2014M3A7B4052193, 2015M3D1A1070465), the Russian Foundation for Basic Research (14-02-91701 NIFa), and the Russian Ministry of Education and Science (State Task 559).
© 2016 The Japan Society of Applied Physics.
ASJC Scopus subject areas
- Physics and Astronomy(all)