The exceedingly strong two-dimensional ferromagnetism in bi-atomic layer SrRuO3 with a critical conduction transition

In recent years, few-layer or even monolayer ferromagnetic materials have drawn a great deal of attention due to the promising integration two-dimensional (2D) magnets into next-generation spintronic devices. The SrRuO3 is rare example stable 2D magnetism under ambient conditions, but only weak ferromagnetism antiferromagnetism has been found. bi-atomic layer as another environmentally inert magnetic system paid less heretofore. Here we study both and in (SrRuO3)n/(SrTiO3)m (n = 1, 2) superlattices which SrTiO3 serves non-magnetic insulating space layer. Although exhibits arguably ferromagnetism, find that exceedingly strong with Tc 125 K saturation magnetization 1.2 µB/Ru, demonstrated by superconducting quantum interference device (SQUID) magnetometry element-specific X-ray circular dichroism. Moreover, SrRuO3, demonstrate random fluctuations orbital reconstructions inevitably occurring limit are critical electrical transport, much ferromagnetism. Our demonstrates an oxide potentials for applications ultracompact