Evolution of dual ferromagnetic behavior near coherent-incoherent crossover in perovskite ruthenate*

The dual contribution of localized and itinerant electrons to magnetism in correlated ferromagnetic SrRuO₃ has been observed experimentally very recently [1]. What we want to know in the next step is how the magnetic behavior of localized and itinerant can be tailored. Here, we performed spin-resolved ARPES experiments on SrRuO₃ thin film with strain engineering. It shows that the tensilely strained SrRuO₃ displays an overall incoherent electronic structure whilst the compressively strained film has coherent band structure, which means that the ratio of localized and itinerant electrons in the system can be controlled. We could measure the strain-dependent spin-polarization of electrons near Fermi level, and at lower Hubbard band. We will show the evolution of spin and electronic sturcture of tunable dual ferromagnetic system in detail. Possible application of tunable correlated ferromagnetic system will be also discussed.

[1] S. Hahn et al., Phys. Rev. Lett. 127, 256401 (2021).