Manipulating surface magnetic order in iron telluride

Abstract

Control of emergent magnetic orders in correlated electron materials promises new opportunities for applications in spintronics. For their technological exploitation, it is important to understand the role of surfaces and interfaces to other materials and their impact on the emergent magnetic orders. Here, we demonstrate for iron telluride, the nonsuperconducting parent compound of the iron chalcogenide superconductors, determination and manipulation of the surface magnetic structure by low-temperature spin-polarized scanning tunneling microscopy. Iron telluride exhibits a complex structural and magnetic phase diagram as a function of interstitial iron concentration. Several theories have been put forward to explain the different magnetic orders observed in the phase diagram, which ascribe a dominant role either to interactions mediated by itinerant electrons or to local moment interactions. Through the controlled removal of surface excess iron, we can separate the influence of the excess iron from that of the change in the lattice structure.

arXiv comment8 pages, 6 figures, published version

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• Oxygen adsorption induced superconductivity in ultrathin FeTe film on SrTiO3(001)
• Surface orbital order and chemical potential inhomogeneity of the iron-based superconductor FeTe0.55Se0.45 investigated with special STM tips
• Atomic-scale coexistence of short-range magnetic order and superconductivity in Fe${}_{1+y}$Se${}_{0.1}$Te${}_{0.9}$
• Acoustic lattice instabilities at the magneto-structural transition in Fe${}_{1.057(7)}$Te
• Magnetic skin effect in Pb(Fe${}_{1/2}$Nb${}_{1/2}$)O${}_3$