Periodic lattice distortions in epitaxial films of Fe(110) on W(110)

Gradmann, U.; Waller, Gordon H.

doi:10.1016/0039-6028(82)90363-6

Cited by 223 publications

(87 citation statements)

References 11 publications

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“…1a). At higher coverages than those displayed in the figure, this additional structure transforms into one that matches the wellknown periodic dislocation network observed in Fe films of similar coverage on W(110) [11].…”

Section: Resultssupporting

confidence: 72%

Phase Coexistence in Two-Dimensional Fe0.70Ni0.30 Films on W(110)

Menteş

Sala

Locatelli

et al. 2015

e-J. Surf. Sci. Nanotech.

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Using low energy electron microscopy, diffraction and x-ray photoemission electron microscopy, we study the phase separation in an Fe-Ni alloy film on W(110) at around 30 at.%Ni and at monolayer thickness. At high temperature, the monolayer-thick alloy is shown to transform into a biphase with submicron regions of different surface density exhibiting (1 × 1) and (1 × 8) structures. The former is pseudomorphic to the bcc substrate, whereas the latter is a slightly-distorted hexagonal adlayer lattice reminiscent of an fcc(111) monolayer. The stoichiometries of the two monolayer phases are Fe0.85Ni0.15 and Fe0.58Ni0.42 in laterally resolved x-ray photoemission microscopy measurements, with the bcc phase rich in Fe compared to the fcc one. This heterogeneous surface can be viewed as the two-dimensional limit of the bcc-fcc phase separation observed in thick films and in bulk Fe-Ni near the same composition. The length scale associated with the lateral heterogeneity in the monolayer film is much larger than the one observed in bulk alloys, suggesting that surface transport is the key mechanism in the kinetics of the phase separation process.

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Section: Resultssupporting

confidence: 72%

Phase Coexistence in Two-Dimensional Fe0.70Ni0.30 Films on W(110)

Menteş

Sala

Locatelli

et al. 2015

e-J. Surf. Sci. Nanotech.

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show abstract

“…Note that no magnetic contrast is found in the voids (Fig. 7c), since only one atomic wetting layer, which is not ferromagnetic at room temperature, remains on the W surface [118]. However, a local in-plane canting of magnetization is observed in the regions adjacent to the voids (see black and white magnetic contrast around the voids in Fig.…”

Section: Self-organized Fe Wires On W(110)mentioning

confidence: 95%

Magnetic imaging with spin-polarized low-energy electron microscopy

Rougemaille

Schmid²

2010

Eur. Phys. J. Appl. Phys.

111

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Abstract. Spin-polarized low-energy electron microscopy (SPLEEM) is a technique for imaging magnetic microstructures at surfaces and in thin films. In this article, principles, advantages and limitations of SPLEEM are reviewed. Several recent studies illustrate how SPLEEM can be used to investigate spin reorientation transition phenomena, to determine magnetic domain configurations in low-dimensional structures, or to explore physics of magnetic couplings in layered systems. The work highlights the capability of the technique to reveal in situ and in real time quantitative information on micromagnetic configurations and structure-property relationships. In addition, spectroscopic reflectivity measurements with spin-polarized low-energy electron beams can be a useful tool to probe spin-dependent unoccupied band structure of magnetic materials and electronic properties of buried magnetic interfaces.

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“…Fe/W(110) films near 2 ML in thickness grow with good layer completion 22 , and have a strong in-plane magnetic anisotropy with an easy axis along the W[110] direction. This system is described by the 2D anisotropic Heisenberg model with nearest-neighbour exchange interaction J and magnetic anisotropy K. Without the anisotropy, the 2D Heisenberg model has no ferromagnetic ground state at finite temperature 23 , but in the presence of the anisotropy, the system crosses over to a 2D Ising model 24 as the correlation length ξ diverges near T c .…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Two-dimensional percolation transition at finite temperature: Phase boundary for in-plane magnetism in films with two atomic layers of Fe on W(110)

Belanger

Venus

2017

Phys. Rev. B

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A two dimensional (2D) percolation transition in Fe/W(110) ultrathin magnetic films occurs when islands in the second atomic layer percolate and resolve a frustrated magnetic state to produce longrange in-plane ferromagnetic order. Novel measurements of the magnetic susceptibility χ(θ) as the films are deposited at a constant temperature, allow the long-range percolation transition to be observed as a sharp peak consistent with a critical phase transition. The measurements are used to trace the paramagnetic-to-ferromagnetic phase boundary between the T = 0 percolation magnetic transition and the thermal Curie magnetic transition of the undiluted film. A quantitative comparison to critical scaling theory is made by fitting the functional form of the phase boundary. The fitted parameters are then used in theoretical expressions for χ(T ) in the critical region of the paramagnetic state to provide an excellent, independent representation of the experimental measurements.

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Periodic lattice distortions in epitaxial films of Fe(110) on W(110)

Cited by 223 publications

References 11 publications

Phase Coexistence in Two-Dimensional Fe<sub>0</sub><i><sub>.</sub></i><sub>70</sub>Ni<sub>0</sub><i><sub>.</sub></i><sub>30 </sub>Films on W(110)

Phase Coexistence in Two-Dimensional Fe<sub>0</sub><i><sub>.</sub></i><sub>70</sub>Ni<sub>0</sub><i><sub>.</sub></i><sub>30 </sub>Films on W(110)

Magnetic imaging with spin-polarized low-energy electron microscopy

Two-dimensional percolation transition at finite temperature: Phase boundary for in-plane magnetism in films with two atomic layers of Fe on W(110)

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