Manganite Heterostructures SrIrO3/La0.7Sr0.3MnO3 and Pt/La0.7Sr0.3MnO3 for Generation and Registration of Spin Current

• Published in: Surface investigation, x-ray, synchrotron and neutron techniques x-ray, synchrotron and neutron techniques, 2024-02, Vol.18 (1), p.210-216
• Main Authors: Ovsyannikov, G. A., Constantinian, K. Y., Ulev, G. D., Shadrin, A. V., Lega, P. V., Orlov, A. P.
• Format: Article
• Language: English
• Subjects: Argon; Chemistry and Materials Science; Epitaxial growth; Ferromagnetic materials; Ferromagnetic resonance; Heterostructures; High temperature; Magnetoresistance; Magnetoresistivity; Magnetron sputtering; Manganites; Materials Science; Single crystals; Spintronics; Substrates; Surfaces and Interfaces; Thin Films
• ISSN: 1027-4510; 1819-7094
• DOI: 10.1134/S1027451024010336

This paper presents the results of experimental studies of the cross section of the interfaces of the SrIrO 3 /La 0.7 Sr 0.3 MnO 3 and Pt/La 0.7 Sr 0.3 MnO 3 , heterostructures, in which, upon excitation of ferromagnetic resonance in a La 0.7 Sr 0.3 MnO 3 film, a spin current arises that flows through the interface in structure. Epitaxial growth of thin films of strontium iridate SrIrO 3 and manganite La 0.7 Sr 0.3 MnO 3 on a (110)NdGaO 3 single-crystal substrate was carried out using magnetron sputtering at a high temperature in a mixture of argon and oxygen gases. The spin mixing conductance, which determines the amplitude of the spin current and generally has real Re g ↑↓ and imaginary Im g ↑↓ parts, was determined from the frequency dependence of the FMR spectrum of the La 0.7 Sr 0.3 MnO 3 film and the heterostructures. It is shown that the Im g ↑↓ quantity can play an important role in determining the spin Hall angle (θ SH ) from the angular dependence of the spin magnetoresistance. For the SrIrO 3 /La 0.7 Sr 0.3 MnO 3 heterostructures, θ SH turns out to be significantly higher (almost an order of magnitude) than that for the Pt/La 0.7 Sr 0.3 MnO 3 heterostructure.