Complex magnetic structure of clusters and chains of Ni and Fe on Pt(111)

Bezerra-Neto, M. M.; Ribeiro, M. S.; Sanyal, Biplab; Bergman, Anders; Muniz, R. B.; Eriksson, Olle; Klautau, A. B.

doi:10.1038/srep03054

Cited by 35 publications

(21 citation statements)

References 48 publications

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“…The negative signal implies an antiparallel coupling between the magnetic moments of the Rh and Co atoms (compare to figure 4) and a parallel coupling between the magnetic moments of Rh and Ni. Assuming that the clusters prefer a certain structure on the surface, this points to a complex, non-collinear spin structure [40,41]. The evaluated small orbital and spin magnetic moments strengthen this interpretation.…”

Section: Samplementioning

confidence: 56%

Quantum size effects of small, size-selected and deposited CoRh clusters on Ni

et al. 2016

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The electronic, chemical and magnetic properties of in situ prepared, mass-selected and deposited Co x Rh y alloy clusters with up to five atoms per cluster have been studied by means of x-ray absorption and x-ray magnetic circular dichroism spectroscopy. The clusters were supported on a remanently magnetized Ni film. The cluster properties exhibit strong size and composition dependent effects. By alloying of pure Co 1,2 adatoms and dimers with Rh the chemical reactivity towards oxygen is significantly enhanced for specific compositions. The oxidation of the alloyed clusters strongly affects the magnetic properties which results in a reduction of the orbital and spin magnetic moments. The exchange coupling between the oxidized Co atoms and the Ni surface exhibits a size and a composition dependent oscillation between antiferromagnetic and ferromagnetic coupling.

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Section: Samplementioning

confidence: 56%

Quantum size effects of small, size-selected and deposited CoRh clusters on Ni

et al. 2016

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“…Spinorbit coupling (SOC) is responsible for a variety of fascinating phenomena in condensed matter physics. For example, the lack of inversion symmetry activates the Dzyaloshinskii-Moriya interaction which favors the occurrence of non collinear ground-state magnetic configurations [3][4][5]. Combined with time-reversal symmetry, it leads to protected conducting states in the so-called topological insulators [6], where spin injection and spin-tocharge conversion were recently demonstrated with the spin-pumping technique [7].…”

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confidence: 99%

Dynamical current-induced ferromagnetic and antiferromagnetic resonances

et al. 2015

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We demonstrate that ferromagnetic and antiferromagnetic excitations can be triggered by the dynamical spin accumulations induced by the bulk and surface contributions of the spin Hall effect. Due to the spin-orbit interaction, a time-dependent spin density is generated by an oscillatory electric field applied parallel to the atomic planes of Fe/W(110) multilayers. For symmetric trilayers of Fe/W/Fe in which the Fe layers are ferromagnetically coupled, we demonstrate that only the collective out-of-phase precession mode is excited, while the uniform (in-phase) mode remains silent. When they are antiferromagnetically coupled, the oscillatory electric field sets the Fe magnetizations into elliptical precession motions with opposite angular velocities. The manipulation of different collective spin-wave dynamical modes through the engineering of the multilayers and their thicknesses may be used to develop ultrafast spintronics devices. Our work provides a general framework that probes the realistic responses of materials in the time or frequency domain.The interplay between charge, spin and orbital angular momentum in nano-structured systems is significantly widening the prospects of future technologies [1,2]. Spinorbit coupling (SOC) is responsible for a variety of fascinating phenomena in condensed matter physics. For example, the lack of inversion symmetry activates the Dzyaloshinskii-Moriya interaction which favors the occurrence of non collinear ground-state magnetic configurations [3][4][5]. Combined with time-reversal symmetry, it leads to protected conducting states in the so-called topological insulators [6], where spin injection and spin-tocharge conversion were recently demonstrated with the spin-pumping technique [7]. In fact, the generation of spin currents and spin accumulations by an electric current, in particular, has been a subject of much interest and research recently [8][9][10][11][12][13][14][15][16]. Several groups showed that these non-equilibrium quantities can be used to set a magnetization into precessional motion in metallic systems [17][18][19], including antiferromagnets [20]. Two recent reviews of the major experimental and theoretical results concerning the charge-to-spin conversion are outlined in Refs. [21,22], for both metal and semiconductor devices.So far, theoretical approaches to current-induced spin currents, accumulations and torques in systems with more elaborate electronic structures are restricted to the case in which the applied electric field is static [23][24][25][26][27]. Here, we take it one step further, and investigate the dynamic magnetic response which is driven by a timedependent electric field, as realized in the original experiments reported in Refs. [17][18][19]28]. One advantage of such an electronic-structure-based method is that it naturally includes all surfaces, interfaces, and bulk contributions [10,29,30] to the spin Hall effect, including the coupling between local moments and the currentinduced spin accumulation of conduction electrons [31], the transp...

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“…Introduction -The ability to manipulate atoms adsorbed on a substrate, 1-3 the possibility to choose a suitable combination of substrate and adatoms, and the recent capacity to tailor microscopic interactions 4,5 permit to obtain nanosystems with specific magnetic properties. Adatoms may interact either ferromagnetically or antiferromagnetically; the coupling with a ferromagnetic substrate may mimic an external field and it also induces spin anisotropies via spin-orbit interaction.…”

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confidence: 99%

Reentrant spin-flop transition in nanomagnets

2014

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Antiferromagnetic chains with an odd number of spins are known to undergo a transition from an antiparallel to a spin-flop configuration when subjected to an increasing magnetic field. We show that in the presence of an anisotropy favoring alignment perpendicular to the field, the spin-flop state appears for both weak and strong field, the antiparallel state appearing for intermediate fields.Both transitions are second order, the configuration varying continuously with the field intensity. Such re-entrant transition is robust with respect to quantum fluctuations and it might be observed in different types of nanomagnets.

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Complex magnetic structure of clusters and chains of Ni and Fe on Pt(111)

Cited by 35 publications

References 48 publications

Quantum size effects of small, size-selected and deposited CoRh clusters on Ni

Quantum size effects of small, size-selected and deposited CoRh clusters on Ni

Dynamical current-induced ferromagnetic and antiferromagnetic resonances

Reentrant spin-flop transition in nanomagnets

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