From collinear to vortex magnetic structures in Mn corrals on Pt(111)

Ribeiro, M. S.; Corrêa, Gregório B.; Bergman, Anders; Nordström, Lars; Eriksson, Olle; Klautau, A. B.

doi:10.1103/physrevb.83.014406

Cited by 14 publications

(13 citation statements)

References 25 publications

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“…6(c) we show that J Mn−Mn , between Mn atoms separated by the same interatomic distance a, decreases very fast with N Mn . For freestanding 58,59 and supporting Mn nanostructures on nonmagnetic substrates, 43,58,60,61 a sensitive dependence of the exchange interaction in Mn nanostrucutures on their environment has also been verified. of Mn neighbors increases, the Mn-Mn coupling switches to AFM, and the Mn-Fe coupling between nearest neighbors changes to FM, with some competition between interactions with further neighbors taking place.…”

Section: B Mn Nanostructures On Fe(001)mentioning

confidence: 93%

First-principles studies of complex magnetism in Mn nanostructures on the Fe(001) surface

et al. 2012

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The magnetic properties of Mn nanostructures on the Fe(001) surface have been studied using the noncollinear first-principles real space-linear muffin-tin orbital-atomic sphere approximation method within density-functional theory. We have considered a variety of nanostructures such as adsorbed wires, pyramids, and flat and intermixed clusters of sizes varying from two to nine atoms. Our calculations of interatomic exchange interactions reveal the long-range nature of exchange interactions between Mn-Mn and Mn-Fe atoms. We have found that the strong dependence of these interactions on the local environment, the magnetic frustration, and the effect of spin-orbit coupling lead to the possibility of realizing complex noncollinear magnetic structures such as helical spin spiral and half-skyrmion.

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Section: B Mn Nanostructures On Fe(001)mentioning

confidence: 93%

First-principles studies of complex magnetism in Mn nanostructures on the Fe(001) surface

et al. 2012

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“…Very recently, it has been predicted based on DFT calculations that small Co clusters on W(110) possess antiferromagnetic or ferrimagnetic ground states [29] illustrating the key impact of the substrate. The antiferromagnetic coupling in Mn clusters leads to a complex trend of noncollinear or AFM states depending on the geometry [23,30]. Experimentally, the RKKY-like oscillation of the exchange interaction between 3d-TM adatoms on metal surfaces has been measured applying STM based on the Kondo effect [31] and single-atom magnetization curves [5,6].…”

Section: Introductionmentioning

confidence: 99%

Complex trend of magnetic order in Fe clusters on4dtransition-metal surfaces. II. First-principles calculations

2014

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We use first-principles calculations based on density functional theory to investigate the magnetic exchange interaction of Fe clusters on Rh(111) and Ru(0001). We consider dimers, trimers, tetramers, and pentamers of different shape in fcc and hcp stacking as well as infinite atomic and biatomic chains. From the dimer calculations, we extract the exchange interaction as a function of adatom distance by mapping total energies to a Heisenberg model. The nearest-neighbor (NN) exchange constant is about one order of magnitude smaller than reported for other substrates due to the strong hybridization between the Fe atoms and the partly filled 4d band of the surface. We also find a transition from a ferromagnetic NN exchange interaction for Fe dimers on Rh (111) to an antiferromagnetic one on Ru(0001). The distance-dependent exchange coupling displays a RKKY-like oscillatory behavior, which is nearly inverted for Fe dimers on the Rh(111) surface compared to those on Ru(0001). Unexpectedly, for Fe clusters beyond dimers, a complex trend of the magnetic ground state is observed which alternates between ferro-and antiferromagnetic configurations depending on cluster size and shape. In view of the exchange constants obtained for dimers, it is surprising that on both surfaces small compact clusters are ferromagnetic while open structures such as linear trimers or tetramers become antiferromagnetic. We demonstrate that both vertical and lateral structural relaxations of the clusters are crucial in order to understand this unexpected trend of magnetic order and connected to the competition of direct ferromagnetic exchange among Fe atoms in the cluster and the hybridization with the substrate.

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“…1-8 These entities can be fabricated directly on surfaces in a bottom-up fashion with scanning tunneling microscopy (STM), [9][10][11] and STM is also used to directly measure their magnetic properties. 12,13 The rich magnetic properties originate in the exchange couplings between the individual magnetic moments [14][15][16][17] and are of great interest for concepts like spin-transfer torque [18][19][20] and spin chirality 21 on the nanoscale, as well as for potential applications in quantum computing. [22][23][24] The STM measurements allow precise access to the properties of the individual magnetic moments, which when combined with tailored construction of the coupling between the spins provide systems where nanomagnets with desired properties can be synthesized.…”

Section: Introductionmentioning

confidence: 99%

Design of magnetic textures of nanocorrals with an extra adatom

Konstantinidis

Lounis

2013

Phys. Rev. B

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It is shown that in antiferromagnetic open or closed corrals of magnetic adatoms grown on surfaces, the attachment of a single extra adatom anywhere in the corral impacts on the geometrical topology of the nanosystem and generates complex magnetic structures when a magnetic field is applied or a magnetic coupling to a ferromagnetic substrate exists. The spin configuration of the corral can be tuned to a nonplanar state or a planar noncollinear or ferrimagnetic state by adjusting its number of sites, the location of the extra adatom, or the strength of the coupling to the ferromagnetic substrate. This shows the possibility to generate nontrivial magnetic textures with atom-by-atom engineering anywhere in the corral and not only at the edges.

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From collinear to vortex magnetic structures in Mn corrals on Pt(111)

Cited by 14 publications

References 25 publications

First-principles studies of complex magnetism in Mn nanostructures on the Fe(001) surface

First-principles studies of complex magnetism in Mn nanostructures on the Fe(001) surface

Complex trend of magnetic order in Fe clusters on4dtransition-metal surfaces. II. First-principles calculations

Design of magnetic textures of nanocorrals with an extra adatom

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