In-cluster-structured exchange-coupled magnets with high energy densities

Authors

X. Rui, University of Nebraska - Lincoln
Jeffrey E. Shield, University of Nebraska - LincolnFollow
Zhiguang Sun, University of Nebraska - LincolnFollow
Yinfan Xu, University of Nebraska - LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

9-19-2006

Comments

Published by American Institute of Physics. Appl. Phys. Lett. 89, 122509 2006. © 2006 American Institute of Physics. Permission to use. http://apl.aip.org/.

Abstract

In this letter, the authors demonstrate isotropic Fe–Pt exchange-spring nanocomposite permanent magnets with a soft magnetic phase fraction of greater than 0.5 with a coercivity of 6.5 kOe, single-phase-like magnetic behavior, and an energy product of 25.1 MG Oe. Sub-10-nm Fe–Pt clusters are formed with compositions in the two-phase Fe₃Pt and FePt regions. Intracluster structuring on a scale of a few nanometers occurs after appropriate heat treatment. This ensures full exchange coupling between the two phases, allowing greater soft magnetic phase fractions. The results provide insight into developing high energy product nanostructured permanent magnets.