Determination of crystal-field parameters of Sm₂Fe₁₇N₃ and Sm₂Fe₁₇C₃

Authors

• S. Wirth, Institut fur Festkorper- und Werkstofforschung Dresden
• M. Wolf, Institut fur Festkorper- und Werkstofforschung Dresden
• K.H. Muller, Institut fur Festkorper- und Werkstofforschung Dresden
• Ralph Skomski, University of Nebraska-LincolnFollow
• S. Brennan, Trinity College, Dublin, Ireland
• J.M.D. Coey, Trinity College, Dublin, Ireland

Document Type

Article

Date of this Version

September 1996

Comments

Published in IEEE TRANSACTIONS ON MAGNETICS, VOL. 32, NO. 5, SEPTEMBER 1996.

Abstract

The crystal-field parameters A₂₀ and A₄₀ were determined from the magnetocrystalline anisotropy constants K₁ and K₂ in a linear approximation for Sm₂Fe₁₇Z_x (Z = N, C) compounds. For the materials investigated, the values of Iη0 are calculated in two ways: i) from the Kί at zero temperature and ii) from the temperature dependence of the Kί. Both methods give equivalent results. The value A₂₀≈-400 Ka₀^-2 has been obtained which corresponds to an inverse THOMAS-FERMI screening length q≈2.3 Å^-1 calculated within the framework of the screened charge model.