Rapid Formation of a Monolayer of Oriented Hard-Magnetic Strontium Hexaferrite Nanoparticles on a Solid Substrate


  • This work was supported by RFBR grant 11-08-01256-a, 12-08-31235-mol-a and DFG project 436 RUS 113/933/0-1. The authors acknowledge partial support from M.V. Lomonosov Moscow State University Program of Development. The authors thank E. Brücher and H. Kremer for their help in magnetic measurements. (Supporting Information is available online from Wiley InterScience or from the author).


Single crystal nanoplatelets of M-type strontium hexaferrite, which were prepared by oxide glass crystallization, form colloidal solutions after consequent leaching and peptization of the nanocrystalline material. The colloids are stabilized by the particles charging to a zeta-potential of about 50 mV. Monolayers of oriented platelet strontium hexaferrite nanoparticles form readily on a glass surface while immersing the substrate in the colloidal solution due to Columb attraction of the positively charged nanoparticles to the negatively charged surface. The films show almost rectangular magnetization hysteresis loops typical for strongly textured hard-magnetic material.