SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Spintronics (other effects)

MA 20.6: Vortrag

Dienstag, 28. März 2023, 16:30–16:45, HSZ 401

Magnetism and proximity-induced Rashba effect at Mn-3d bands of asymmetric BaMnO₃|KTaO₃ heterojunction — •Vivek Kumar and Nirmal Ganguli — Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal 462066, India

Rashba-like spin-orbit interaction (SOI) at oxide heterostructures emerges as a much sought-after feature in the context of oxide spintronics and spin-orbitronics. KTaO₃ (KTO) is one of the best substrates available for the purpose, owing to its strong SOI and alternating +1|−1 charged layers along the (001) direction. We visualize the Rashba-like interaction in the KTO (001) surface with the help of spin texture plotted directly from DFT calculations along with the isoenergetic contours, providing a confirmatory test of the presence of only linear Rashba interaction [1]. We use ab initio DFT to examine the asymmetric BaMnO₃|KTaO₃ (BMO|KTO) oxide heterostructure where the inequivalent bottom and top interfaces break the inversion symmetry due to their opposite polar discontinuities. We observe Rashba-like splitting for the bands of Mn-3d near the Fermi level of C-type antiferromagnetic (AFM) BMO|KTO owing to the proximity to Ta atoms from the 5d series. We comprehensively analyze Rashba-like SOI with the help of three-dimensional band dispersion and projected spin textures for Rashba-like Mn-3d bands. Our results reveal reasonably strong linear Rashba interaction in the heterostructure. The rigorous analysis of spin textures of the AFM heterostructure presented here may be crucial for spintronics. [1] V. Kumar and N. Ganguli, Phys. Rev. B 106, 125127 (2022).