Magnetic moment of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>films with thicknesses near the unit-cell size

Gomes, G. F.; Bueno, T.E.P.; Parreiras, D. E.; Abreu, G. J. P.; Siervo, Abner de; Cezar, J. C.; Pfannes, H.‐D.; Paniago, R.

doi:10.1103/physrevb.90.134422

Cited by 17 publications

(12 citation statements)

References 25 publications

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“…For the former case, while there is a reported work with a measured electron mean free path of 4.5 nm [28], Goering has argued that a much lower value is appropriate, in the range of 0.8 nm. Such a number has been recently confirmed by experiments in ultrathin films where an estimate of 1.3 nm was measured [29]. In such case the spectra would not be expected to differ much for the two kinetic energies (mean free path of 0.5 and 0.8 nm, respectively), and thus both spectra would be expected to provide a high sensitivity to the near surface structure of the crystal.…”

supporting

confidence: 53%

Spin and orbital magnetic moment of reconstructed2×2R45∘magnetite(001)

et al. 2015

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The surface of a magnetite single crystal with (001) orientation has been prepared by sputtering/annealing cycles providing the √ 2 × √ 2R45• reconstruction. The distribution of magnetic domains on the surface has been imaged by x-ray magnetic dichroism in a photoemission microscope. The easy axes are along the surface in-plane 110 directions. The near-surface magnetic moment was determined by applying the sum rules to XMCD spectra obtained with different kinetic energies of the secondary electrons. A reduced total moment of 3.3 μ B and a ratio of about 0.10 between orbital and spin moment was found, which we attribute to the surface reconstruction.

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supporting

confidence: 53%

Spin and orbital magnetic moment of reconstructed2×2R45∘magnetite(001)

et al. 2015

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“…There are some reports concerning the possible existence of a magnetically dead layer at the interface [41][42][43], but others ascribe the decrease of the magnetization in the thin films to the presence of antiphase boundaries leading to superparamagnetic behavior of the domains [44][45][46]. Our findings may give credit to the proponents of the dead magnetic layer model.…”

supporting

confidence: 76%

Dynamic Atomic Reconstruction: HowFe3O4Thin Films Evade Polar Catastrophe for Epitaxy

Chang

Klein

et al. 2016

Phys. Rev. X

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Polar catastrophe at the interface of oxide materials with strongly correlated electrons has triggered a flurry of new research activities. The expectations are that the design of such advanced interfaces will become a powerful route to engineer devices with novel functionalities. Here, we investigate the initial stages of growth and the electronic structure of the spintronic Fe 3 O 4 =MgO ð001Þ interface. Using soft x-ray absorption spectroscopy, we have discovered that the so-called A-sites are completely missing in the first Fe 3 O 4 monolayer. This discovery allows us to develop an unexpected but elegant growth principle in which, during deposition, the Fe atoms are constantly on the move to solve the divergent electrostatic potential problem, thereby ensuring epitaxy and stoichiometry at the same time. This growth principle provides a new perspective for the design of interfaces.

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“…However, the latter is expected to be small for transition metal compounds at room temperature 49 . Self-absorption effects can also be neglected since we are measuring secondary electrons and the probing depth of the order of 1 nm 50 is well below the x-ray absorption length even for grazing incidence (10 and 20 nm at L 3 and L 2 edges, respectively). The moments obtained are m orb = 0.18 μ B and m spin = 0.94 μ B for Fe and m orb = 0.13 μ B and m spin = 1.13 μ B for Ni per cation, giving a total moment of 3.4 μ B per formula unit.…”

Section: Resultsmentioning

confidence: 99%

Structure and magnetism of ultrathin nickel-iron oxides grown on Ru(0001) by high-temperature oxygen-assisted molecular beam epitaxy

Mandziak

Figuera

Ruiz-Gómez

et al. 2018

Sci Rep

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We demonstrate the preparation of ultrathin Fe-rich nickel ferrite (NFO) islands on a metal substrate. Their nucleation and growth are followed in situ by low-energy electron microscopy (LEEM). A comprehensive characterization is performed combining LEEM for structural characterization and PEEM (PhotoEmission Electron Microscopy) with synchrotron radiation for chemical and magnetic analysis via X-ray Absorption Spectroscopy and X-ray Magnetic Circular Dichroism (XAS-PEEM and XMCD-PEEM, respectively). The growth by oxygen-assisted molecular beam epitaxy takes place in two stages. First, islands with the rocksalt structure nucleate and grow until they completely cover the substrate surface. Later three-dimensional islands of spinel phase grow on top of the wetting layer. Only the spinel islands show ferromagnetic contrast, with the same domains being observed in the Fe and Ni XMCD images. The estimated magnetic moments of Fe and Ni close to the islands surface indicate a possible role of the bi-phase reconstruction. A significant out-of-plane magnetization component was detected by means of XMCD-PEEM vector maps.

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Magnetic moment ofFe3O4films with thicknesses near the unit-cell size

Cited by 17 publications

References 25 publications

Spin and orbital magnetic moment of reconstructed2×2R45∘magnetite(001)

Spin and orbital magnetic moment of reconstructed2×2R45∘magnetite(001)

Dynamic Atomic Reconstruction: HowFe3O4Thin Films Evade Polar Catastrophe for Epitaxy

Structure and magnetism of ultrathin nickel-iron oxides grown on Ru(0001) by high-temperature oxygen-assisted molecular beam epitaxy

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