Spin-polarized scanning tunneling spectroscopy of dislocation lines in Fe films on W(1 1 0)

Bode, Matthias; Bergmann, Kirsten; Pietzsch, O.; Kubetzka, André; Wiesendanger, R.

doi:10.1016/j.jmmm.2006.02.098

Cited by 12 publications

(5 citation statements)

References 24 publications

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“…It was shown that, in the top-most layer of the large DL islands, the local magnetization direction is inhomogeneous, with a gradual canting of the magnetic moment from the perpendicular direction in the center of the island towards an in-plane direction at the edges. For the continuous DL prepared at elevated temperature and thus containing dislocation lines, the out-of-plane magnetized stripe domains were found at 15 K. 23 To summarize this section, we would like to emphasize certain experimental limitations when studying magnetic properties at the nanoscale level. The SP-STS technique has a defined depth resolution because the sensitivity of this technique is strictly confined to the surface.…”

Section: Introductionmentioning

confidence: 99%

Perpendicular magnetic anisotropy and noncollinear magnetic structure in ultrathin Fe films on W(110)

Ślęzak

Freindl

et al. 2013

Phys. Rev. B

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We used nuclear resonant scattering (NRS) of synchrotron radiation to investigate the details of the thicknessinduced spin reorientation transition (SRT) in ultrathin epitaxial iron films on W(110), where the thicknesses of the films ranged from 1-5 monolayers. During growth, the magnetization of the Fe film, which was probed by the hyperfine magnetic field, changes from a noncollinear configuration with an out-of-plane magnetic component to the homogeneously magnetized state with the in-plane [1-10] easy direction. The fast acquisition of the experimental NRS spectra combined with the high sensitivity of this technique to the orientation of the hyperfine magnetic fields allowed us to study the magnetic evolution during SRT in detail. Our results reveal the complex character of this transition, which has been intensively studied in the past. The noncollinear magnetic structure appears in the system of the mono-, double-, and trilayer areas that coexist due to deviation from the layer-by-layer growth of iron on W(110). We also report the observation of out-of-plane magnetic anisotropy in the double-layer areas at temperatures as high as 300 K. By comparing the experimental results with density functional theory calculations, we conclude that surface magnetic moments are enhanced by 25%.

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Section: Introductionmentioning

confidence: 99%

Perpendicular magnetic anisotropy and noncollinear magnetic structure in ultrathin Fe films on W(110)

Ślęzak

Freindl

et al. 2013

Phys. Rev. B

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“…During evaporation, the pressure did not exceed 2 × 10 −10 mbar. The cleaning of the W(110) substrates was performed by multiple alternations of (i) annealing at a temperature of 1500 K in an oxygen atmosphere under a pressure of 5 × 10 −7 mbar for 20 min to oxidize carbon and (ii) a flash at an elevated temperature of 2200 K to remove the tungsten oxide formed on the surface 5,6) (see also Ref. 7).…”

Section: Experimental Methodsmentioning

confidence: 99%

Morphological and magnetic analysis of Fe nanostructures on W(110) by using scanning tunneling microscopy and Lorentz microscopy

Schaefer

Чернов

Sapozhnik

et al. 2016

Jpn. J. Appl. Phys.

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We investigated morphological features and magnetic properties of epitaxial Fe nanostructures (films, stripes and nanoparticles) on a W(110) surface with monoatomic steps preferentially along the direction. The nanostructures were prepared in ultra-high vacuum by using electron-beam evaporation and subsequent annealing at different temperatures. Scanning tunneling microscopy measurements in-situ revealed elongated Fe nanostructures with aspect ratios of up to . The observable shape and orientation (along or perpendicular to the monoatomic steps of the substrate) of the nanostructures depended substantially on the preparation parameters. By capping the system with 7 monolayers of Pt, the magnetic properties of selected Fe nanostructures could be analyzed ex-situ using Lorentz microscopy revealing diversified results. Depending on the size and shape, different magnetization structures, such as single domain, two domains and vortex, were observed. A precise intensity profile analysis demonstrated that the magnetic field values of different magnetic structures are close to each other and equal 2.4 T.

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“…The growth of Fe on W(110) has been performed by many groups [10,[24][25][26]. From these studies it is clear that while the first layer is pseudomorphic when grown on the substrate at room temperature or hotter, three layers or thicker always present a misfit dislocation network to adapt the lattice mismatch between Fe and W. The transition regime from pseudomorphic to a relaxed film occurs through the nucleation and growth of misfit dislocations within a film thicknesses of 2 ML.…”

Section: Structure Determination a Leem And Leedmentioning

confidence: 99%

“…Both mentioned experiments were carried out at room temperature. Using a higher substrate temperature, several groups [24,26] obtained films of mostly pseudomorphic 2 ML with just a few isolated dislocation lines. It is clear from the published experiments that the bilayer is at the very limit of the pseudomorphic stability, and that particular details of a given sample and growth conditions can trigger the nucleation of the misfit dislocations at different 2 ML coverages: terrace size, impurities, temperature, etc.…”

Section: Structure Determination a Leem And Leedmentioning

confidence: 99%

Structure and stability of ultrathin Fe films on W(110)

et al. 2016

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The growth of one and two atomic layers of iron on a W(110) substrate was followed by low-energy electron microscopy. The near-surface structural properties of the perfectly flat pseudomorphic films were studied by quantitative low-energy electron diffraction analysis from areas of uniform thickness as well as by the density functional theory. A strong relaxation of the outermost atomic layers was found in Fe mono-and bi-layers on W(110). By calculating the phonon dispersion relations and phonon density of states, the stability of the pseudomorphic iron bi-layer on a tungsten substrate has been addressed. To complete the physical picture, an iron tri-layer has also been analysed in order to identify the source of instability for its pseudomorphic phase. Our results show that the surface instability originates from the softening of the in-plane surface modes along the [1-10] direction, although the soft modes were not observed. The enhanced magnetic moments calculated within the density functional theory are in good agreement with experimental findings reported for these systems.

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Spin-polarized scanning tunneling spectroscopy of dislocation lines in Fe films on W(1 1 0)

Cited by 12 publications

References 24 publications

Perpendicular magnetic anisotropy and noncollinear magnetic structure in ultrathin Fe films on W(110)

Perpendicular magnetic anisotropy and noncollinear magnetic structure in ultrathin Fe films on W(110)

Morphological and magnetic analysis of Fe nanostructures on W(110) by using scanning tunneling microscopy and Lorentz microscopy

Structure and stability of ultrathin Fe films on W(110)

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