Quantum well states with nonvanishing parallel momentum in Cu/Co/Cu(100)

Kloth, Philipp; Wenderoth, M.; Willke, Philip; Prüser, Henning; Ulbrich, R. G.

doi:10.1103/physrevb.89.125412

Cited by 2 publications

(3 citation statements)

References 40 publications

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“…2. The spectrum from a clean Cu surface [labeled (a)] is almost featureless, as expected for a Cu(001) surface [38]. The spectrum measured on the depressions [labeled (b)] is very similar to the spectrum from a clean Cu surface, with only a minor enhancement in the positive bias voltage region.…”

Section: Structures After Cobalt Deposition On a Hot Substratementioning

confidence: 75%

Direct epitaxial growth of subsurface Co nanoclusters

et al. 2014

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A new subsurface growth mode in the Co-Cu system is reported. This mode provides a direct subsurface growth of Co nanoclusters by depositing Co atoms on the Cu(001) surface in a single stage. The resulting subsurface Co nanoclusters are located 2 monolayers (ML) deep below the atomically flat surface of Cu(001). Although these hidden nanoclusters cannot be directly accessed by a scanning tunneling microscopy/spectroscopy (STM/STS) probe, their shape could be deduced using STM/STS via a careful analysis of the local deformation of the Cu(001) surface as well as local variations of surface electron density induced by the subsurface clusters. A strongly asymmetric shape of the nanoclusters is deduced: they are typically 5-10 nm in lateral size but only 2 to 3 ML in thickness. The thickness of the nanoclusters does not evolve significantly under a heat treatment. A simple model is implemented to describe the growth kinetics. The results in this study reveal that intense processes of diffusion, nucleation, and growth take place in a region 1 nm deep, thus defining the near-surface region.

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Section: Structures After Cobalt Deposition On a Hot Substratementioning

confidence: 75%

Direct epitaxial growth of subsurface Co nanoclusters

et al. 2014

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“…To gain a quantitative understanding, we fitted the QWS energy positions in the energy-thickness plane using the so-called phase accumulation model (PAM) 33,[37][38][39][40][41][42] , where electrons inside Pd are confined in a potential well of width N P d . This corresponds to the quantum mechanics example of a particle in a box.…”

Section: III Results and Discussionmentioning

confidence: 99%

“…To observe this effect two prerequisites need to be fulfilled: (a) in order to form distinct QWS, the Pd films should ideally be grown in a layer-by-layer manner, resulting in the most homogenous film thickness over the MOKE probing area (0.1 mm 2 ); (b) the interface between the FM Co film and Pd needs to be atomically sharp. In particular, interface roughness needs to be low to ensure pronounced QWS 33 . The Pd/Co/Cu(001) system (see inset of Figure 1a) fulfills both requirements.…”

Section: II Experimental Detailsmentioning

confidence: 99%

The role of electron confinement in Pd films for the oscillatory magnetic anisotropy in an adjacent Co layer

Manna

Przybylski

Sander

et al. 2016

J. Phys.: Condens. Matter

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We demonstrate the interplay between quantum well states in Pd and the magnetic anisotropy in Pd/Co/Cu(001) by combined scanning tunneling spectroscopy (STS) and magneto optical Kerr effect (MOKE) measurements. Low temperature scanning tunneling spectroscopy reveals occupied and unoccupied quantum well states (QWS) in atomically flat Pd films on Co/Cu(001). These states give rise to sharp peaks in the differential conductance spectra. A quantitative analysis of the spectra reveals the electronic dispersion of the Pd(001) d-band (∆5-type) along the Γ-X direction. In-situ MOKE experiments on Pd/Co/Cu(1, 1, 13) uncover a periodic variation of the in-plane uniaxial magnetic anisotropy as a function of Pd thickness with a period of 6 atomic layers Pd. STS shows that QWS in Pd cross the Fermi level with the same periodicity of 6 atomic layers. Backed by previous theoretical work we ascribe the variation of the magnetic anisotropy in Co to QWS in the Pd overlayer. Our results suggest a novel venue towards tailoring uniaxial magnetic anisotropy of ferromagnetic films by exploiting QWS in an adjacent material with large spin-orbit coupling.

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Quantum well states with nonvanishing parallel momentum in Cu/Co/Cu(100)

Cited by 2 publications

References 40 publications

Direct epitaxial growth of subsurface Co nanoclusters

Direct epitaxial growth of subsurface Co nanoclusters

The role of electron confinement in Pd films for the oscillatory magnetic anisotropy in an adjacent Co layer

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