Structure and magnetism of atomically thin Fe layers on flat and vicinal Pt surfaces

Repetto, Diego; Lee, T. Y.; Rusponi, Stefano; Honolka, Jan; Kuhnke, Klaus; Sessi, Violetta; Starke, Ulrich; Brune, Harald; Gambardella, Pietro; Carbone, C.; Enders, Axel; Kern, Klaus

doi:10.1103/physrevb.74.054408

Cited by 58 publications

(49 citation statements)

References 43 publications

(44 reference statements)

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“…In case of an Fe ML on FCC Ir(001), the large layer relaxation leads to a spin spiral ground state [5,6]. An investigation of the magnetism of an Fe ML on Pt(111) and at a Pt step-edge also led to the conclusion that the crystallographic structure plays a significant role in the formation of the magnetic structure [7]. Another mechanism that can affect the magnetic ordering of a monolayer is the hybridization between the monolayer and the substrate.…”

Section: Introductionmentioning

confidence: 99%

Spin-correlations and magnetic structure in an Fe monolayer on 5dtransition metal surfaces

Simon¹,

Palotás²,

Újfalussy³

et al. 2014

J. Phys.: Condens. Matter

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Abstract. We present a detailed first principles study on the magnetic structure of an Fe monolayer on different surfaces of 5d transition metals. We use the spin-cluster expansion technique to obtain parameters of a spin model, and predict the possible magnetic ground state of the studied systems by employing the mean field approach and in certain cases by spin dynamics calculations. We point out that the number of shells considered for the isotropic exchange interactions plays a crucial role in the determination of the magnetic ground state. In the case of Ta substrate we demonstrate that the out-of-plane relaxation of the Fe monolayer causes a transition from ferromagnetic to antiferromagnetic ground state. We examine the relative magnitude of nearest neighbour Dzyaloshinskii-Moriya (D) and isotropic (J) exchange interactions in order to get insight into the nature of magnetic pattern formations. For the Fe/Os(0001) system we calculate a very large D/J ratio, correspondingly, a spin spiral ground state. We find that, mainly through the leading isotropic exchange and Dzyaloshinskii-Moriya interactions, the inward layer relaxation substantially influences the magnetic ordering of the Fe monolayer. For the Fe/Re(0001) system characterized by large antiferromagnetic interactions we also determine the chirality of the 120 • Néel-type ground state.PACS numbers: 75.10.Hk Spin-correlations and magnetic structure in an Fe monolayer on 5d transition metal surfaces2

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Section: Introductionmentioning

confidence: 99%

Spin-correlations and magnetic structure in an Fe monolayer on 5dtransition metal surfaces

Simon¹,

Palotás²,

Újfalussy³

et al. 2014

J. Phys.: Condens. Matter

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“…16 We show that the nearestneighbor exchange interaction, J 1 , in the Fe ML changes continuously from antiferromagnetic ͑AFM͒ to ferromagnetic ͑FM͒ with filling of the substrate d band. Due to topological frustration on a triangular lattice, AFM coupling for Fe on Re͑0001͒ and Ru͑0001͒ leads to a Néel ground state with angles of 120°between adjacent spins.…”

mentioning

confidence: 99%

“…11 Surfaces of 4d-and 5d-transition metals ͑TMs͒ such as W, Re, Ru, or Ir have been particularly attractive from an experimental point of view as ultrathin 3d-TM films can often be grown pseudomorphically and without intermixing. [12][13][14][15][16] However, there has been controversy in the past about reports concerning dead magnetic layers and absence of magnetic order in ultrathin films on these surfaces. 14,15 The fundamental key to many unresolved puzzles may be the itinerant character of TMs resulting in competing exchange interactions beyond nearest neighbors and higher-order spin interactions beyond the Heisenberg model.…”

mentioning

confidence: 99%

Complex magnetism of iron monolayers on hexagonal transition metal surfaces from first principles

Hardrat¹,

Al-Zubi

Ferriani³

et al. 2009

Phys. Rev. B

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Using first-principles calculations, we demonstrate that an Fe monolayer can assume very different magnetic phases on hcp ͑0001͒ and fcc ͑111͒ surfaces of 4d-and 5d-transition metals. Due to the substrates' d-band filling, the nearest-neighbor exchange coupling of Fe changes gradually from antiferromagnetic ͑AFM͒ for Fe films on Tc, Re, Ru, and Os to ferromagnetic on Rh, Ir, Pd, and Pt. In combination with the topological frustration on the triangular lattice of these surfaces the AFM coupling results in a 120°Néel structure for Fe on Re and Ru and an unexpected double-row-wise AFM structure on Rh, which is a superposition of left-and right-rotating 90°spin spirals. DOI: 10.1103/PhysRevB.79.094411 PACS number͑s͒: 75.70.Ak, 71.15.Mb Triggered by the discovery of the giant-magnetoresistance effect and the demand to realize spintronic device concepts, 1 magnetic nanostructures on surfaces have been a focus of experimental and theoretical research for more than 20 years now. In particular, there has been a tremendous effort to grow ultrathin transition-metal films on metal surfaces and to characterize and explain their magnetic properties. It is now generally believed that these structurally simple systems are well understood and more complex nanostructures such as atomic chains, clusters, or molecules on surfaces have moved into the spotlight of today's research. [2][3][4][5][6][7] Therefore, it came as a big surprise when it was experimentally shown that the prototypical ferromagnet Fe becomes a two-dimensional ͑2D͒ antiferromagnet on the W͑001͒ surface. 8 Combining spin-polarized scanning tunneling microscopy and first-principles calculations, it has been further demonstrated that complex magnetic order can be obtained even in single monolayer ͑ML͒ magnetic films on nonmagnetic substrates. For example, recently a spin-spiral state was discovered for a Mn ML on W͑110͒ ͑Ref. 9͒ and for a Mn ML on W͑001͒ ͑Ref. 10͒ and a nanoscale magnetic structure was found for an Fe ML on Ir͑111͒. 11 Surfaces of 4d-and 5d-transition metals ͑TMs͒ such as W, Re, Ru, or Ir have been particularly attractive from an experimental point of view as ultrathin 3d-TM films can often be grown pseudomorphically and without intermixing. 12-16 However, there has been controversy in the past about reports concerning dead magnetic layers and absence of magnetic order in ultrathin films on these surfaces. 14,15 The fundamental key to many unresolved puzzles may be the itinerant character of TMs resulting in competing exchange interactions beyond nearest neighbors and higher-order spin interactions beyond the Heisenberg model. The latter interactions have been proposed to play a role in transition metals; however, to our knowledge, no unambiguous proof of their importance has been given.Here, we use first-principles calculations to demonstrate that a hexagonal Fe ML can assume very different magnetic phases on a triangular lattice provided by hcp ͑0001͒ and fcc ͑111͒ surfaces of 4d-and 5d-transition metals, which are also experimentally accessib...

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“…Both the magnetization [27,30], and the nonlinear optical susceptibility [17], in the interfacial region are known to depend sensitively on the type and number of nearest neighbours.…”

Section: Hysteresis Loops and Curie Curves Frommentioning

confidence: 99%

Magnetic Second-Harmonic Generation From Interfaces and Nanostructures

McGilp¹

2012

Epioptics-11

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Magneto-optic techniques provide non-contact and non-destructive characterization of magnetic materials. This includes embedded magnetic nanostructures, which are accessible due to the large penetration depth of optical radiation. The linear magneto-optic Kerr effect is widely used in the growth and characterization of ultra-thin magnetic films and can show monolayer sensitivity. Nonlinear magnetic second-harmonic generation (MSHG) is a more difficult and expensive technique but, uniquely, can measure the surface and interface magnetism of centrosymmetric magnetic films with sub-monolayer sensitivity. MSHG is briefly reviewed and examples from high symmetry interfaces and nanostructures described. Low symmetry structures are more difficult to characterize, however, because of the large number of tensor components that may contribute to the signal. An important class of low symmetry systems exploits vicinal substrates to grow aligned magnetic nanostructures by self-organization. These structures have a high proportion of magnetic step or edge atoms relative to the terrace atoms, and the overall magnetic response is expected to contain significant contributions from these different magnetic regions. It is shown that contributions from these different regions can be identified using normal A c c e p t e d m a n u s c r i p t

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Structure and magnetism of atomically thin Fe layers on flat and vicinal Pt surfaces

Cited by 58 publications

References 43 publications

Spin-correlations and magnetic structure in an Fe monolayer on 5dtransition metal surfaces

Spin-correlations and magnetic structure in an Fe monolayer on 5dtransition metal surfaces

Complex magnetism of iron monolayers on hexagonal transition metal surfaces from first principles

Magnetic Second-Harmonic Generation From Interfaces and Nanostructures

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