Intrinsic Properties of Fe-Substituted L10Magnets

Authors

Priyanka Manchanda, LMN Institute of Information TechnologyFollow
Pankaj Kumar, Kendriya VidhyalayaFollow
Arti Kashyap, LMN Institute of Information TechnologyFollow
M. J. Lucis, University of Nebraska-Lincoln
Jeffrey E. Shield, University of Nebraska-LincolnFollow
A. Mubarok, University of Massachusetts - Amherst
J. I. Goldstein, University of Massachusetts - Amherst
S. Constantinides, Arnold Magnetic Technologies
K. Barmak, Columbia University
L.H. Lewis, Northeastern UniversityFollow
David J. Sellmyer, University of Nebraska-LincolnFollow
Ralph Skomski, University of Nebraska-LincolnFollow

Date of this Version

2013

Citation

IEEE TRANSACTIONS ON MAGNETICS, VOL. 49, NO. 10, OCTOBER 2013; DOI: 10.1109/TMAG.2013.2261821

Comments

Copyright 2013 IEEE. Used by permission.

Abstract

First-principle supercell calculations are used to determine how 3d elemental additions, especially Fe additions,modify the magnetization, exchange and anisotropy of L1₀-ordered ferromagnets. Calculations are performed using the VASP code and partially involve configurational averaging over site disorder. Three isostructural systems are investigated: Fe-Co-Pt,Mn-Al-Fe, and transition metal-doped Fe-Ni. In all three systems the iron strongly influences the magnetic properties of these compounds, but the specific effect depends on the host. In CoPt(Fe) iron enhances the magnetization, with subtle changes in the magnetic moments that depend on the distribution of the Fe and Co atoms. The addition of Fe to MnAl is detrimental to the magnetization, because it creates antiferromagnetic exchange interactions, but it enhances the magnetic anisotropy. The replacement of 50% of Mn by Fe in MnFeAl₂ enhances the anisotropy from 1.77 to 2.5 MJ/m³. Further, the substitution of light 3d elements such as Ti, V, Cr into L1₀-ordered FeNi is shown to substantially reduce the magnetization.