Influence of external magnetic fields on the growth of alloy nanoclusters

Einax, Mario; Heinrichs, Stefan; Maass, Philipp; Majhofer, A.; Dieterich, W.

doi:10.1088/0953-8984/19/8/086227

Cited by 11 publications

(4 citation statements)

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“…A uniaxial in-plane magnetocrystalline anisotropy is generated in these samples by applying inplane magnetic field during the growth. This is an established procedure to control magnetic anisotropies in transition metal structures and in Co/Pt systems has been ascribed to anisotropic bonding effects at the Co/Pt interface [21]. We can therefore expect that the induced inplane magnetic anisotropy will be reflected in the TAMR characteristics only for sample A in which the Pt/Co interface is in contact with the tunnel barrier.…”

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confidence: 99%

Tunneling Anisotropic Magnetoresistance in Multilayer-(Co/Pt)/AlOx/PtStructures

et al. 2008

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We report observations of tunneling anisotropic magnetoresitance (TAMR) in vertical tunnel devices with a ferromagnetic multilayer-(Co/Pt) electrode and a non-magnetic Pt counter-electrode separated by an AlOx barrier. In stacks with the ferromagnetic electrode terminated by a Co film the TAMR magnitude saturates at 0.15% beyond which it shows only weak dependence on the magnetic field strength, bias voltage, and temperature. For ferromagnetic electrodes terminated by two monolayers of Pt we observe order(s) of magnitude enhancement of the TAMR and a strong dependence on field, temperature and bias. Discussion of experiments is based on relativistic ab initio calculations of magnetization orientation dependent densities of states of Co and Co/Pt model systems.PACS numbers: 85.75. Mm,75.45.+j,75.50.Cc Anisotropic magnetoresistance (AMR) sensors replaced in the early 1990s classical magneto-inductive coils in hard-drive readheads launching the era of spintronics. Their utility has, however, remained limited partly because the response of these ferromagnetic resistors to changes in magnetization orientation originates from generically subtle spin-orbit (SO) interaction effects [1]. Currently widely used giant magnetoresistance [2] and tunneling magnetoresistance (TMR) [3] elements comprising (at least) two magnetically decoupled ferromagnetic layers provided a remarkably elegant way of tying the magnetoresistance response directly to the ferromagnetic exchange splitting of the carrier bands without involving SO-coupling. Large magnetoresistances in these devices are, nevertheless, obtained at the expense of a significantly increased structure complexity, necessary to guarantee independent and different magnetization switching characteristics and spin-coherence of transport between the ferromagnetic layers.Studies of AMR effects [4,5,6,7] in ferromagnetic semiconductor tunneling devices showed that AMR response can in principle be huge and richer than TMR, with the magnitude and sign of the magnetoresistance dependent on the magnetic field orientation and electric fields. Subsequent theoretical work predicted [8] that the tunneling AMR (TAMR) effect is generic in ferromagnets with SO-coupling, including the high Curie temperature transition metal systems. A detailed investigation of the TAMR is therefore motivated both by its intricate relativistic quantum transport nature and by its potential in more versatile alternatives to current TMR devices which will not require two independently controlled ferromagnetic electrodes and spin-coherent tunneling.Experimental demonstration of the TAMR in a tunnel junction with a ferromagnetic metal electrode has recently been reported [9] in an epitaxial Fe/GaAs/Au stack. The observed TAMR in this structure is relatively small, bellow 0.5%, consistent with the weak SO-coupling in Fe. In this paper we present a study of vertical tunnel devices in which the ferromagnetic electrode comprises alternating Co and Pt films. We build upon the extensive literature [10,11,12,13,14,15] o...

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confidence: 99%

Tunneling Anisotropic Magnetoresistance in Multilayer-(Co/Pt)/AlOx/PtStructures

et al. 2008

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“…Special attention has been devoted towards the structure of alloy clusters 26 as well as their growth. 27 Attempts to generate perpendicular magnetic anisotropy have been performed to check the shape anisotropy due to dipolar interactions, experimentally and theoretically. In addition, the use of a magnetic eld is of considerable interest in a number of practical applications due to the self-diffusion coefficient alteration under a magnetic eld.…”

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confidence: 99%

Magnetized property effect of a non-aqueous solvent upon complex formation between kryptofix 22DD with lanthanum(iii) cation: experimental aspects and molecular dynamics simulation

et al. 2016

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“…8 In the submonolayer growth regime one-monolayer islands can act as seeds for 3D structures that emerge in later stages of growth. [9][10][11][12] Island nucleation and submonolayer growth of binary systems, driven by co-deposition of two species A and B, has recently been investigated by using rate equations and kinetic Monte-Carlo (KMC) simulations. 13 Generalized relations were established that describe the scaling of stable island densities with the partial fluxes F α (α = A or B), adatom diffusion coefficients D α and mutual binding energies E αβ .…”

Section: Introductionmentioning

confidence: 99%

Self-consistent rate theory for submonolayer surface growth of multicomponent systems

2014

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The self-consistent rate theory for surface growth in the submonolayer regime is generalized from mono-to multi-component systems, which are formed by codeposition of different types of atoms or molecules. As a new feature, the theory requires the introduction of pair density distributions to enable a symmetric treatment of reactions among different species. The approach is explicitly developed for binary systems and tested against kinetic Monte Carlo simulations. Using a reduced set of rate equations, only a few differential equations need to be solved to obtain good quantitative predictions for island and adatom densities, as well as densities of unstable clusters.

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Influence of external magnetic fields on the growth of alloy nanoclusters

Cited by 11 publications

References 20 publications

Tunneling Anisotropic Magnetoresistance in Multilayer-(Co/Pt)/AlOx/PtStructures

Tunneling Anisotropic Magnetoresistance in Multilayer-(Co/Pt)/AlOx/PtStructures

Magnetized property effect of a non-aqueous solvent upon complex formation between kryptofix 22DD with lanthanum(iii) cation: experimental aspects and molecular dynamics simulation

Self-consistent rate theory for submonolayer surface growth of multicomponent systems

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