SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Thin Films: Magnetic Anisotropy

MA 17.5: Vortrag

Dienstag, 28. März 2023, 10:30–10:45, POT 6

Characterization of buffer-free Sm(Co_5−xCu_x)₅ thin films grown by molecular beam epitaxy — •Georgia Gkouzia¹, Damian Günzing², Teresa Wessels^2,3, Marton Major¹, Alpha T. N Diaye⁴, Andras Kovacs³, Heiko Wende², Katharina Ollefs², and Lambert Alff¹ — ¹Technical University of Darmstadt, Materials Science, Darmstadt, Germany — ²University of Duisburg-Essen, Faculty of Physics and Center for Nanointegration, Duisburg, Germany — ³Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Gruenberg Institute, Forschungszentrum Juelich, Germany — ⁴Lawrence Berkeley National Laboratory, Berkeley, USA

SmCo₅ permanent magnets were already known in the 60s due to their enormous uniaxial magnetic anisotropy K1=17.2 MJ/m³ which has made them key materials for many applications. Sm-Co system, in a certain parameter range, undergoes a phase decomposition into a nanocomposite of SmCo₅ and Sm₂Co₁₇ phases. Since it is known that Cu stabilizes the SmCo₅ phase, in this work, buffer-free Sm(Co_5−xCu_x)₅ thin films have been grown by molecular beam epitaxy (MBE). The films have been characterized by x-ray diffraction (XRD), superconducting quantum interference device (SQUID), and transition electron microscopy (TEM). High coercivity, 1.67 T has been achieved, among the largest values for buffer-free SmCo₅ films. X-ray magnetic circular dichroism (XMCD) element-specific hysteresis loops show clear evidence of the Sm-Co de-coupled moments due to Cu substitution in the Co-sublattice.