Favorable optical response for non-ferromagnetic (La2/3Sr1/3MnO3)n/SrTiO3 (001) ultrathin heterojunction: a potential photomagnetoelectric device
College of Safety Science and Engineering, Xi’an University of Science and Technology, 710054, Xi’an, Shaanxi, People’s Republic of China
2 College of Science, Xi’an University of Science and Technology, 710054, Xi’an, Shaanxi, People’s Republic of China
3 College of Physics and Information Technology, Shaanxi Normal University, 710062, Xi’an, Shaanxi, People’s Republic of China
Accepted: 22 August 2022
Published online: 31 August 2022
In the present paper, we study the thickness-dependent characteristics for non-ferromagnetic (LSMO)n/SrTiO3 ((LSMO)n/STO) (001) heterojunctions with n = 3, 6 and 9, using the first-principles method. Either ferrimagnetic or antiferromagnetic ground state is stabilized, depending on the interface stacking sequence and LSMO layer thickness. The estimated potential barrier at LSMO/STO (001) interface is insensitive to the thickness of LSMO layer, and nonstoichiometric La2/3Sr1/3O/TiO2 interfaces embrace a smaller interface barrier. Interestingly, the non-ferromagnetic (LSMO)n/STO (001) heterojunctions with La2/3Sr1/3O/TiO2 interface show a significant enhancement in visible-light absorption as the LSMO layer thickness increases. Our work is helpful for designing the non-ferromagnetic photomagnetoelectric systems and may be interesting for antiferromagnetic spintronics.
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