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MA: Fachverband Magnetismus

MA 17: Thin Films: Magnetic Anisotropy

MA 17.5: Talk

Tuesday, March 28, 2023, 10:30–10:45, POT 6

Characterization of buffer-free Sm(Co5−xCux)5 thin films grown by molecular beam epitaxy — •Georgia Gkouzia1, Damian Günzing2, Teresa Wessels2,3, Marton Major1, Alpha T. N Diaye4, Andras Kovacs3, Heiko Wende2, Katharina Ollefs2, and Lambert Alff11Technical 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(Co5−xCux)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.

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