Formation of magnetically ordered array of two types of rectangular nanorods, ∼300 nm in length and a few nanometers in size, is achieved in the Mn-doped Co Fe2 O4 spinel through chemical phase separation mediated by cooperative Jahn-Teller distortions. At room temperature, the magnetic nanorods, with composition close to Co Fe2 O4, interlace with the paramagnetic counterparts and form a highly organized checkerboard pattern in the cross section. The checkerboard size in the range of ∼13.8×7.9-∼17. 3×14.0 nm2 is tunable with composition and, particularly, with the isothermal annealing time. These three-dimensional nanocheckerboards exhibit a nearly ideal configuration for the patterned perpendicular recording medium.
Bibliographical noteFunding Information:
We thank the useful discussion with Dr. Y. Ni, a postdoctoral fellowship from the Department of Materials Science and Engineering, Rutgers University. The research was supported by the National Science Council, Taiwan, under the Contract Nos. NSC95-2752-M-002-006-PAE (National Taiwan University) and NSF-DMR-0405682 (Rutgers).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)