Unusually High Magnetic Response in Nanocrystals for Data Storage
Magnetization-magnetic field profiles for cobalt ferrite synthesized before and after acidic treatment. The coercivity was as high as 7.9 kOe in the acidic treated sample.
Furthermore, our most recent results evidenced that the coercivity of the cobalt ferrite nanocrystals could be enhanced even further. A post-acidic treatment of the ferrite nanocrystals caused their coercivity to rise up to 8 kOe at room temperature. The corresponding average crystallite size was 20 nm. To our knowledge, this is the highest coercivity value reported so far in the scientific literature. This value is even above the theoretically predicted maximum of 5.3 kOe. This type of nanosize material can be considered a very promising material for data storage.