Appearance of Ferromagnetism in Pt(100) Ultrathin Films Originated from Quantum-well States

Ferromagnetism was observed in a Pt(100) ultrathin film deposited on a SrTiO3(100) substrate. The ferromagnetism, which appears in films with thicknesses of 2.2-4.4 nm, periodically changes with a period of approximately 1 nm (5-6 monolayers) depending on the film thickness. This is consistent with the period derived from the quantum-well states formed in the thin film. X-ray magnetic circular dichroism measurements show the evidence of appearance of intrinsic ferromagnetism in Pt(100) ultra-thin film. In addition, present results suggest a possibility that the orbital magnetic moment of pure Pt is much smaller than that of the Pt/ferromagnetic multilayer system.

Automated summary

Ferromagnetism was observed in an ultrathin Pt(100) film deposited on a SrTiO3(100) substrate. The ferromagnetism periodically changes with the film thickness, and the orbital magnetic moment of pure Pt is smaller than that of the Pt/ferromagnetic multilayer system.