Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 44: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)

DS 44.10: Talk

Friday, March 20, 2020, 12:00–12:15, HSZ 04

Probing the origin of ferromagnetic stability in LSMO/SRO — •Anna Zakharova — Swiss Light Source, Paul Scherrer Institut

The technological application of optimally doped mangnite is hindered due to the existence of a magnetic dead layer. However, when in contact with SrRuO₃ La_0.7Sr_0.3MnO₃ remains magnetic down to 1-2 u.c. Therefore in this work we investigate the origin of the ferromagnetic stability of LSMO in LSMO/SRO bilayers by using resonant x-ray spectroscopy varying thickness of LSMO and SRO deposited on SrTiO₃. Magnetic switching of LSMO in proximity with 20 u.c. SRO was observed even below critical thickness of LSMO. Moreover, 4 u.c. of LSMO shows remanence above SRO T_c. The XLD data evidences a preferential d3z²−r² occupation of Mn in LSMO/SRO interface in agreement with theoretical predictions. In addition, different Mn valence is observed for ultra-thin LSMO/SRO in comparison to LSMO//STO. These results combined can explain why the ferromagnetism is stabilized at LSMO/SRO interface.