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

Document Type

Article

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.