Epitaxial strain and magnetic anisotropy in ultrathin Co films on W(110)

Fritzsche, H.; Kohlhepp, JT Jürgen; Gradmann, U.

doi:10.1103/physrevb.51.15933

Cited by 110 publications

(91 citation statements)

References 32 publications

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“…2d), which reflects the fact that the hexagonal base planes of Co(0001) are parallel to W(110). In agreement with previous findings 6,7,8,9 , the growth proceeds in the Nishiyama-Wasserman orientation, i.e., the close-packed Co rows along [1120] run parallel to W [001]. In this thickness range, the epitaxial strain amounts to a few percent 6 .…”

Section: Resultssupporting

confidence: 90%

Magnetism of orderedSm∕Co(0001)surface structures

et al. 2005

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The epitaxial system Sm/Co(0001) was studied for Sm coverages up to 1 monolayer (ML) on top of ultrathin Co/W(110) epitaxial films. Two ordered phases were found for 1/3 and 1 ML Sm, respectively. The valence state of Sm was determined by means of photoemission and magnetic properties were measured by magneto-optical Kerr effect. We find that 1 ML Sm causes a strong increase of the coercivity with respect to that of the underlying Co film. Element-specific hysteresis loops, measured by using resonant soft x-ray reflectivity, show the same magnetic behaviour for the two elements.

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Section: Resultssupporting

confidence: 90%

Magnetism of orderedSm∕Co(0001)surface structures

et al. 2005

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“…hcp structure, and Co films deposited on the W(110) surface with the same coverage range, but following a reconstructed hcp structure found experimentally [33][34][35][36][37] . The free-standing Co films are used to identify which characteristics of the spin-wave dispersion arise from the reduced dimensionality and which can be attributed to the W(110) substrate.…”

Section: Ground State Propertiesmentioning

confidence: 89%

First-principles investigation of spin-wave dispersions in surface-reconstructed Co thin films on W(110)

2017

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We computed spin-wave dispersions of surface-reconstructed Co films on the W(110) surface in the adiabatic approximation. The magnetic exchange interactions are obtained via first-principles electronic-structure calculations using the Korringa-Kohn-Rostoker Green-function method. We analyze the strength and oscillatory behavior of the intralayer and interlayer magnetic interactions and investigate the resulting spin-wave dispersions as a function of the thickness of Co films. In particular, we highlight and explain the strong impact of hybridization of the electronic states at the Co-W interface on the magnetic exchange interactions and on the spin-wave dispersions. We compare our results to recent measurements based on electron-energy-loss spectroscopy [E. Michel, H. Ibach, and C.M. Schneider, Phys. Rev. B 92, 024407 (2015)]. Good overall agreement with experimental findings can be obtained by considering the possible overestimation of the spin splitting, stemming from the local-spin-density approximation, and adopting an appropriate correction.

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“…51,52 The Curie temperature for Co/W͑110͒ exceeded 380 K for thickness above 1.9 cp ML. 52 For Co/W͑110͒, an extrapolation to zero magnetic moment at 0.9 ͑0001͒ cp ML at room temperature 53 and an extrapolation of the Curie temperature to 0 K at 1.1 ͑0001͒ cp ML have been reported. 52 If these extrapolations are valid, then they would indicate that the magnetic moments on the Co atoms in immediate contact with W are quenched.…”

Section: B Magnetismmentioning

confidence: 96%

Growth morphology, structure, and magnetism of ultrathin Co films on W(111)

et al. 2003

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The growth morphology, structure, and magnetism of ultrathin Co films on the W͑111͒ surface are studied with conventional and spin polarized low energy electron microscopy and diffraction and first principles total energy calculations. Pseudo-layer-by-layer growth of thick pseudomorphic ͑ps͒ Co films is observed at 380 K, while Stranski-Krastanov growth and transformation to a ͑6ϫ6͒ closed-packed structure are observed at higher temperatures. On the basis of the calculations, only one ps Co monolayer is expected to be thermodynamically stable against three-dimensional island formation. Calculations also indicate that the magnetic moment on Co atoms at the interface is reduced due to strong hybridization with the substrate, but remains non-zero even for the single ps monolayer. Metastable ps Co/W͑111͒ is found experimentally to be ferromagnetically ordered at 380 K when film thickness exceeds 7.6 ps ML. Although only in-plane magnetization is observed, substrate atomic steps have a strong influence on the magnetization easy axis and magnetic domain structure, which suggests that the in-plane magnetocrystalline anisotropy is weak.

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Epitaxial strain and magnetic anisotropy in ultrathin Co films on W(110)

Cited by 110 publications

References 32 publications

Magnetism of orderedSm∕Co(0001)surface structures

Magnetism of orderedSm∕Co(0001)surface structures

First-principles investigation of spin-wave dispersions in surface-reconstructed Co thin films on W(110)

Growth morphology, structure, and magnetism of ultrathin Co films on W(111)

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