Determination of spin-polarized quantum well states and spin-split energy dispersions of Co ultrathin films grown on Mo(110)

Park, J. S.; Quesada, A.; Meng, Yuanlin; Li, J.; Jin, Eric N.; Son, Ho Sung; Tan, Ai-Girl; Wu, J.; Hwang, Chanyong; Zhao, H. W.; Schmid, Andreas K.; Qiu, Z. Q.

doi:10.1103/physrevb.83.113405

Cited by 10 publications

(4 citation statements)

References 39 publications

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“…To ascertain their origin, we examined the electronic states of Co films on Mo(110), which are isostructural to Co films on W(110) and magnetized, likewise, along the Co [1100] surface direction [32,33]. Mo (Z = 42) is much lighter than W (Z = 74) and has largely reduced spin-orbit effects [20].…”

Section: Resultsmentioning

confidence: 99%

Magnetization-dependent Rashba splitting of quantum well states at the Co/W interface

et al. 2015

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Exchange and Rashba spin-orbit interactions are expected to couple at ferromagnetic-metal/heavy-metal interfaces and influence their electronic structure. We examine these largely unexplored effects in Co(0001) films on W(110) by angle-resolved photoemission spectroscopy. We find breaking of inversion symmetry in the band dispersion of magnetic quantum well states along structurally equivalent directions of the Co films. Ab initio calculations ascribe this unusual band behavior to the relative orientation of coexisting exchange and Rashba fields. These findings elucidate fundamental interface electronic effects, which are associated to spin-orbit phenomena at ferromagnetic-metal/heavy-metal junctions.

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Section: Resultsmentioning

confidence: 99%

Magnetization-dependent Rashba splitting of quantum well states at the Co/W interface

et al. 2015

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“…While one might argue that quantum confinement is mostly associated with quasi-free (s-, p-like) electrons while magnetic properties are mostly determined by localized d electrons, the existence of d-QWSs has also recently been revealed [132,133], along with their influence on MAE of layered systems. For instance, thickness-dependent spin-split dispersions for Co thin films on Mo (110) have been measured [134]. Further experimental studies on ferromagnetic Fe [135] and Co [136] films show an oscillatory uniaxial anisotropy having a period of a few monolayers.…”

Section: Tuning Magnetic Properties Of Thin Films With External Elect...mentioning

confidence: 98%

Controlling magnetism on metal surfaces with non-magnetic means: electric fields and surface charging

Brovko

Ruiz-Díaz

Dasa

et al. 2014

J. Phys.: Condens. Matter

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We review the state of the art of surface magnetic property control with non-magnetic means, concentrating on metallic surfaces and techniques such as charge-doping or external electric field (EEF) application. Magneto-electric coupling via EEF-based charge manipulation is discussed as a way to tailor single adatom spins, exchange interaction between adsorbates or anisotropies of layered systems. The mechanisms of paramagnetic and spin-dependent electric field screening and the effect thereof on surface magnetism are discussed in the framework of theoretical and experimental studies. The possibility to enhance the effect of EEF by immersing the target system into an electrolyte or ionic liquid is discussed by the example of substitutional impurities and metallic alloy multilayers. A similar physics is pointed out for the case of charge traps, metallic systems decoupled from a bulk electron bath. In that case the charging provides the charge carrier density changes necessary to affect the magnetic moments and anisotropies in the system. Finally, the option of using quasi-free electrons rather than localized atomic spins for surface magnetism control is discussed with the example of Shockley-type metallic surface states confined to magnetic nanoislands.

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“…It was shown that even for closely matched materials (Ag and Au), a reflectivity of few percent leads to observable effects of electron confinement. 3,4 Microscopic methods, such as scanning tunneling spectroscopy 5,6 and low-energy electron microscopy, 7 can reveal the presence of discrete QW states in films of reduced lateral dimensions (a few tens of nanometers) with limited momentum resolution. Complementarily, angle-resolved photoemission spectroscopy (ARPES) provides high energy and momentum resolutions at once, but averages over few to hundreds of micrometers (mainly depending on the optical focusing of the photon beam).…”

Section: ■ Introductionmentioning

confidence: 99%

Electron Confinement Effects in Silver Films Embedded between Graphene and Metallic Substrates

et al. 2019

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We examine the electronic structure of Ag deposits intercalated between graphene and Co(0001). Angle-resolved photoemission spectroscopy measurements reveal the formation of Ag sp-derived quantum well states due to finite electron reflectivity across the buried metal/metal interface. This observation provides evidence of flat Ag(111) film growth underneath graphene, in analogy with the layer-by-layer growth of Ag on the corresponding graphene-free surfaces. Band dispersion and spectral properties of the quantum well states reflect primarily the interaction with the supporting substrate. Signatures of the coupling between graphene and the underlying films are the shift of the Ag(111) surface state, the hybridization gap opening of the π state crossing the Ag 4d states, the downward shift of the Dirac point (n-type doping), and the gap between π and π* Dirac cones. Similar observations are reported for Ag(111) films intercalated between Gr and Pt(111). These systems can be considered as prototypes of graphene-protected thin metal films displaying electron confinement effects.

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Determination of spin-polarized quantum well states and spin-split energy dispersions of Co ultrathin films grown on Mo(110)

Cited by 10 publications

References 39 publications

Magnetization-dependent Rashba splitting of quantum well states at the Co/W interface

Magnetization-dependent Rashba splitting of quantum well states at the Co/W interface

Controlling magnetism on metal surfaces with non-magnetic means: electric fields and surface charging

Electron Confinement Effects in Silver Films Embedded between Graphene and Metallic Substrates

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