Anisotropy of W in Fe and Co

Authors

Arti Kashyap, LNM Institute of Information TechnologyFollow
Priyanka Manchanda, LMN Institute of Information TechnologyFollow
P. K. Sahota, LNM Institute of Information Technology Jaipur, Rajasthan, India
Ralph Skomski, University of Nebraska-LincolnFollow
Jeffrey E. Shield, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

10-2011

Citation

IEEE TRANSACTIONS ON MAGNETICS, VOL. 47, NO. 10, OCTOBER 2011; Doi: 10.1109/TMAG.2011.2157317

Comments

Copyright 2011 IEEE. Used by permission.

Abstract

The magnetization and magnetic anisotropy of iron-rich Fe-W and W-Co intermetallics and nanostructures are investigated by firstprinciple calculations. The W atom is antiferromagnetically coupled to nearest neighbor Co atom and interface Fe atom in the case of Fe-W multilayers. The first anisotropy constants are positive, nearly zero, or negative, depending on the atomic structures. Typical anisotropy energies per atom are ‒0.513 meV for a dilute W-Co alloy, ‒0.06 meV for W₂Fe₂, and 0.44 meV for W₂Fe₄ (0.1 MeV/atom ~ 1 MJ/m³). These values are of interest for permanent-magnet applications but also indicate the need for careful structural control and for a more detailed investigation of structure-property relationships in Fe-W nanostructures.