Rau, C.Schneider, C.Xing, G.Jamison, K.2015-04-242015-04-241986Rau, C., Schneider, C., Xing, G., et al.. "Ferromagnetic order at surfaces of ultrathin epitaxial fcc γ-Fe(111)p(11) films on Cu(111)." <i>Physical Review Letters,</i> 57, no. 25 (1986) American Physical Society: 3221. http://dx.doi.org/10.1103/PhysRevLett.57.3221.https://hdl.handle.net/1911/79654Electron-capture spectroscopy has been used to investigate long-ranged and short-ranged two-dimensional magnetic order at free (uncoated) surfaces of homogeneous (island-free), ultrathin fcc γ-Fe(111)(1×1) films pseudomorphically deposited on Cu(111) substrate crystals. At 298 K, the electron-spin polarization at the surface of a four-monolayer thin fcc Fe film amounts to +16%, directly revealing the existence of long-ranged ferromagnetic order. There is evidence that short-ranged ferromagnetic order still exists at 400 K at free surfaces of two and one-monolayer thin fcc Fe films.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.57.3221