FePt nanodot arrays with perpendicular easy axis, large coercivity, and extremely high density

Authors

Chaehyun Kim, University at Buffalo, the State University of New York, Buffalo, New York
Thomas Loedding, University at Buffalo, the State University of New York, Buffalo, New York
Seongjin Jang, University at Buffalo, the State University of New York, Buffalo, New York
Hao Zeng, University at Buffalo, the State University of New York, Buffalo, New York
Zhen Li, University of Nebraska - Lincoln
Yucheng Sui, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

10-23-2007

Comments

Published by American Institute of Physics. Appl. Phys. Lett. 91, 172508 2007. © 2007 American Institute of Physics. Permission to use. http://apl.aip.org/.

Abstract

Ordered FePt nanodot arrays with extremely high density have been developed by physical vapor deposition using porous alumina templates as evaporation masks. Nanodot diameter of 18 nm and periodicity of 25 nm have been achieved, resulting in an areal density exceeding 1 x10¹² dots/in². Rapid thermal annealing converts the disordered fcc to L1₀ phase, resulting in (001)-oriented FePt nanodot arrays with perpendicular anisotropy and large coercivity, without the need of epitaxy. High anisotropy and coercivity, perpendicular easy axis orientation and extremely high density are desirable features for future magnetic data storage media applications.