Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Magnetic Thin Films II

MA 21.8: Vortrag

Mittwoch, 27. Februar 2008, 15:45–16:00, H 1012

Temperature dependent anisotropy in epitaxial PrCo₇ films — •Ajit Patra¹, Michael Eisterer², Steffen Wirth³, Konstantin Nenkov¹, Sebastian Fähler¹, Ludwig Schultz¹, and Volker Neu¹ — ¹IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²Atomic Institute of the Austrian Universities, Stadionallee 2, A-1020 Vienna, Austria — ³MPI for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Germany

Research on RE-Co magnets with a TbCu₇ structure has been intensified in recent years because of their potential as permanent magnets for high temperature applications. RECo₇ magnets display a unique combination of intrinsic properties such as a high saturation polarization, a high Curie temperature and a room temperature uniaxial anisotropy. In order to tailor the extrinsic properties of these magnets, a better understanding of the intrinsic properties is necessary. In this work, the temperature dependence of the anisotropy constants for an epitaxial PrCo₇ film is investigated. Magnetization curves have been measured with field applied along different angles with respect to the easy axis (which is the crystallographic c-axis) at various temperatures. A full range fitting procedure to simulated magnetization loops leads to the determination of the first and second uniaxial anisotropy constants (K₁ and K₂) as a function of the temperature. The spin reorientation transition from uniaxial anisotropy to an easy cone anisotropy is described as a sign reversal of K₁ and the spin reorientation angle is determined.