Magnetic Anisotropy of One-Dimensional Nanostructures of Transition Metals

Dorantes-Dávila, J.; Pastor, G.

doi:10.1103/physrevlett.81.208

Cited by 158 publications

(140 citation statements)

References 19 publications

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“…It is known that spontaneous magnetic orderings in one-and two-dimensional spin lattice model are difficult to achieve at finite temperature 24 . Spin correlation lengths comparable to nanoscale systems, however, is possible in practice 25,26,27,28 . Here, we also expect that spin orderings are realizable because of the large anisotropic exchange interactions between the spins in ribbons with split-gate geometry on the substrate.…”

mentioning

confidence: 99%

Half-metallic graphene nanoribbons

Son

Cohen

Louie

2006

Nature

4,079

146

3,556

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Electrical current can be completely spin polarized in a class of materials known as half-metals, as a result of the coexistence of metallic nature for electrons with one spin orientation and insulating for electrons with the other. Such asymmetric electronic states for the different spins have been predicted for some ferromagnetic metals−for example, the Heusler compounds 1 −and were first observed in a manganese perovskite 2 . In view of the potential for use of this property in realizing spin-based electronics, substantial efforts have been made to search for half-metallic materials 3,4 . However, organic materials have hardly been investigated in this context even though carbonbased nanostructures hold significant promise for future electronic device 5 . Here we predict halfmetallicity in nanometre-scale graphene ribbons by using first-principles calculations. We show that this phenomenon is realizable if in-plane homogeneous electric fields are applied across the zigzag-shaped edges of the graphene nanoribbons, and that their magnetic property can be controlled by the external electric fields. The results are not only of scientific interests in the interplay between electric fields and electronic spin degree of freedom in solids 6,7 but may also open a new path to explore spintronics 3 at nanometre scale, based on graphene 8,9,10,11

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mentioning

confidence: 99%

Half-metallic graphene nanoribbons

Son

Cohen

Louie

2006

Nature

4,079

146

3,556

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“…For instance, in a Co atom, a large MCA of 9.3 meV/atom (about 200 times larger than that in bulk Co) was observed in Co adsorbates on a Pt substrate. 23 Theoretical studies predict that extremely low-dimensional 4d and 5d TM systems, such as atomic dimers 24,25 and atomic chains, 18,19 can have fairly large MCAs on the order of tens of meV/atom, which are enhanced even more as the interatomic distances increase. Moreover, the small MCAs of Co and Fe are enhanced when Co monolayers (ML) on Au(111) 26 and Fe MLs on Pt(001) surfaces 27 are capped by additional Au and Pt layers, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 The 4d and 5d TMs (Ru, Rh, and Pd [10][11][12][13] and Os, Ir, and Pt 14,15 ) isovalent to Fe, Co, and Ni exhibit ferromagnetic (FM) ground states at certain thicknesses. Numerous ab initio studies have shown that 4d and 5d atoms can possess induced magnetism in particular conditions, [16][17][18][19][20][21][22] which can be classified into two categories: (i) spontaneous magnetism from a structural change such as reduced dimension, 18,19 volume expansion, 20,21 or crystal structures that differ from naturally existing ones; 22 or (ii) induced magnetism from strong hybridization with magnetic metals. 16,17 The 4d and 5d magnetism can lead to a larger MCA than conventional 3d magnetism because of stronger SOC.…”

Section: Introductionmentioning

confidence: 99%

Extremely large perpendicular magnetic anisotropy of an Fe(001) surface capped by5dtransition metal monolayers: A density functional study

et al. 2013

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Significant enhancement of the magnetocrystalline anisotropy (MCA) of an Fe(001) surface capped by 4d and 5d transition metal monolayers is presented in this study using first principles density functional calculations. In particular, an extremely large perpendicular MCA of +10 meV/Ir was found in Ir-capped Fe(001), which originates not from the Fe but from the large spin-orbit coupling of the Ir atoms. From the spin-channel decomposition of the MCA matrix and electronic structure analyses, we find that strong 3d-5d band hybridization in the minority spin state is responsible for the sign changes of the MCA from parallel to perpendicular.

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“…These experimental observations were explained based on electronic structure calculations which emphasized the crucial role played by the substrate, reduced symmetry, and structural relaxations for the magnetocrystalline anisotropy. [12][13][14][15] The large magnetic anisotropies led to slow relaxation dynamics of the magnetization and the observation of magnetic hysteresis loops at low temperatures indicative of ferromagnetic coupling. In another experiment, Mn chains of up to 10 atoms were created by manipulation with a scanning tunneling microscopy tip on an insulating CuN layer grown on Cu͑001͒.…”

Section: Introductionmentioning

confidence: 99%

Structurally driven magnetic state transition of biatomic Fe chains on Ir(001)

2009

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Using first-principles calculations, we demonstrate that the magnetic exchange interaction and the magnetocrystalline anisotropy of biatomic Fe chains grown in the trenches of the ͑5 ϫ 1͒ reconstructed Ir͑001͒ surface depend sensitively on the atomic arrangement of the Fe atoms. Two structural configurations have been considered which are suggested from recent experiments. They differ by the local symmetry and the spacing between the two strands of the biatomic Fe chain. Since both configurations are very close in total energy they may coexist in experiment. We have investigated collinear ferro-and antiferromagnetic solutions as well as a collinear state with two moments in one direction and one in the opposite direction ͑↑↓↑-state͒. For the structure with a small interchain spacing, there is a strong exchange interaction between the strands and the ferromagnetic state is energetically favorable. In the structure with larger spacing, the two strands are magnetically nearly decoupled and exhibit antiferromagnetic order along the chain. In both cases, due to hybridization with the Ir substrate the exchange interaction along the chain axis is relatively small compared to free-standing biatomic iron chains. The easy magnetization axis of the Fe chains also switches with the structural configuration and is out-of-plane for the ferromagnetic chains with small spacing and along the chain axis for the antiferromagnetic chains with large spacing between the two strands. Calculated scanning tunneling microscopy images and spectra suggest the possibility to experimentally distinguish between the two structural and magnetic configurations.

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Magnetic Anisotropy of One-Dimensional Nanostructures of Transition Metals

Cited by 158 publications

References 19 publications

Half-metallic graphene nanoribbons

Half-metallic graphene nanoribbons

Extremely large perpendicular magnetic anisotropy of an Fe(001) surface capped by5dtransition metal monolayers: A density functional study

Structurally driven magnetic state transition of biatomic Fe chains on Ir(001)

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