Structure and magnetism of new rare- earth-free intermetallic compounds: Fe3+xCo3−xTi2 (0 ≤ x ≤ 3)

Authors

Balamurugan Balamurugan, University of Nebraska-LincolnFollow
Bhaskar Das, University of Nebraska - Lincoln
Manh Cuong Ngyuen, US Department of Energy
Xiaoshan Xu, University of Nebraska-LincolnFollow
Jie Zhang, Iowa State University
Xiaozhe Zhang, University of Nebraska - Lincoln
Yaohua Liu, Oak Ridge National Laboratory
Ashfia Huq, Oak Ridge National Laboratory
Shah R. Valloppilly, University of Nebraska - LincolnFollow
Yunlong Jin, University of Nebraska - Lincoln
Cai-Zhuang Wang, US Department of Energy
Kai-Ming Ho, US Department of Energy
David J. Sellmyer, University of Nebraska - LincolnFollow

Document Type

Article

Date of this Version

2016

Citation

APL Mater. 4, 116109 (2016)

Comments

© Author(s) 2016.

https://doi.org/10.1063/1.4968517

Abstract

We report the fabrication of a set of new rare-earth-free magnetic compounds, which form the Fe₃Co₃Ti₂-type hexagonal structure with P-6m2 symmetry. Neutron powder diffraction shows a significant Fe/Co anti-site mixing in the Fe₃Co₃Ti₂ structure, which has a strong effect on the magnetocrystalline anisotropy as revealed by first-principle calculations. Increasing substitution of Fe atoms for Co in the Fe₃Co₃Ti₂ lattice leads to the formation of Fe₄Co₂Ti₂ , Fe₅CoTi, and Fe₆Ti₂ with significantly improved permanent-magnet properties. A high magnetic anisotropy (13.0 Mergs/cm3) and sat- uration magnetic polarization (11.4 kG) are achieved at 10 K by altering the atomic arrangements and decreasing Fe/Co occupancy disorder.