Giant Magnetic Anisotropy in Tetragonal FeCo Alloys

Till Burkert, Lars Nordström, Olle Eriksson, and Olle Heinonen
Phys. Rev. Lett. 93, 027203 – Published 9 July 2004

Abstract

In order to further increase the recording density in hard disk drives, new media materials are required. Two essential parameters of future recording media are a large uniaxial magnetic anisotropy energy (MAE) Ku and a large saturation magnetization Ms. Based on first-principles theory, we predict that very specific structural distortions of FeCo alloys possess these desired properties. The discovered alloy has a saturation magnetization that is about 50% larger than that of FePt—a compound that has received considerable attention lately—with a uniaxial MAE that can easily be tailored reaching a maximum value that is 50% larger than that of FePt.

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  • Received 15 January 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.027203

©2004 American Physical Society

Authors & Affiliations

Till Burkert1,*, Lars Nordström1, Olle Eriksson1, and Olle Heinonen2

  • 1Department of Physics, Uppsala Universitet, Box 530, 751 21 Uppsala, Sweden
  • 2Seagate Technology, 7801 Computer Avenue S., Bloomington, Minnesota 55435, USA

  • *Electronic address: till.burkert@fysik.uu.se

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Vol. 93, Iss. 2 — 9 July 2004

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