Magnetic surface reconstruction in the van der Waals antiferromagnet 
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Trainer, Christopher; Songvilay, M.; Qureshi, N.; Stunault, A.; Yim, Chi Ming; Rodriguez, Efrain E.; Heil, Christoph; Tsurkan, V.; Green, M. A.; Loidl, A.; Wahl, Peter; Stock, Chris

doi:10.1103/physrevb.103.024406

Cited by 9 publications

(7 citation statements)

References 84 publications

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“…The reduction in J in the surface layer is consistent with the lower Curie temperature T C found in thin films and in the monolayer limit, where T C is suppressed significantly [4,5]. This system therefore confirms the previously observed trend that while the surface of a magnetic bulk material does not exhibit radically different magnetic properties, there are subtle differences [25].…”

Section: Discussionsupporting

confidence: 88%

Relating spin-polarized STM imaging and inelastic neutron scattering in the van-der-Waals ferromagnet Fe3GeTe2

Trainer,

Armitage,

Lane

et al. 2021

Preprint

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Van-der-Waals (vdW) ferromagnets have enabled the development of heterostructures assembled from exfoliated monolayers with spintronics functionalities, making it important to understand and ultimately tune their magnetic properties at the microscopic level. Information about the magnetic properties of these systems comes so far largely from macroscopic techniques, with little being known about the microscopic magnetic properties. Here, we combine spin-polarized scanning tunneling microscopy and quasi-particle interference imaging with neutron scattering to establish the magnetic and electronic properties of the metallic vdW ferromagnet Fe 3 GeTe 2 . By imaging domain walls at the atomic scale, we can relate the domain wall width to the exchange interaction and magnetic anisotropy extracted from the magnon dispersion as measured in inelastic neutron scattering, with excellent agreement between the two techniques. From comparison with Density Functional Theory calculations we can assign the quasi-particle interference to be dominated by spin-majority bands. We find a dimensional dichotomy of the bands at the Fermi energy: bands of minority character are predominantly two-dimensional in character, whereas the bands of majority character are three-dimensional. We expect that this will enable new design principles for spintronics devices.

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Section: Discussionsupporting

confidence: 88%

Relating spin-polarized STM imaging and inelastic neutron scattering in the van-der-Waals ferromagnet Fe3GeTe2

Trainer,

Armitage,

Lane

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The reduction in J in the surface layer is consistent with the lower Curie temperature T C found in thin films and in the monolayer limit, where T C is suppressed significantly [4,5]. This system therefore confirms the previously observed trend that, while the surface of a magnetic bulk material does not exhibit radically different magnetic properties, there are subtle differences [27].…”

Section: Discussionsupporting

confidence: 90%

Relating spin-polarized STM imaging and inelastic neutron scattering in the van der Waals ferromagnetFe3GeTe2

Trainer

Lane

et al. 2022

Phys. Rev. B

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Van der Waals (vdW) ferromagnets have enabled the development of heterostructures assembled from exfoliated monolayers with spintronics functionalities, making it important to understand and ultimately tune their magnetic properties at the microscopic level. Information about the magnetic properties of these systems comes, so far, largely from macroscopic techniques, with little being known about the microscopic magnetic properties. Here, we combine spin-polarized scanning tunneling microscopy and quasiparticle interference imaging with neutron scattering to establish the magnetic and electronic properties of the metallic vdW ferromagnet Fe 3 GeTe 2 . By imaging domain walls at the atomic scale, we can relate the domain wall width to the exchange interaction and magnetic anisotropy extracted from the magnon dispersion as measured in inelastic neutron scattering, with excellent agreement between the two techniques. From comparison with density functional theory calculations we can assign the quasiparticle interference to be dominated by spin-majority bands. We find a dimensional dichotomy of the bands at the Fermi energy: bands of minority character are predominantly two-dimensional in character, whereas the bands of majority character are three-dimensional. We expect that this will enable new design principles for spintronics devices.

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“…Previous measurements on the unstrained Fe 1+x Te sample have reported magnetic surface reconstruction, where spins tilt out of the surface and acquire a finite angle with the b direction. 21 We therefore expect that strain can have a different impact on the bulk and surface magnetic structure, and any change in the bulk only follows at higher levels of strain. This raises the exciting possibility that the surface layer responds more sensitively to uniaxial strain than the bulk of the material.…”

Section: ■ Resultsmentioning

confidence: 99%

Strain-Stabilized (π, π) Order at the Surface of Fe_1+xTe

et al. 2021

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A key property of many quantum materials is that their ground state depends sensitively on small changes of an external tuning parameter, e.g., doping, magnetic field, or pressure, creating opportunities for potential technological applications. Here, we explore tuning of the ground state of the nonsuperconducting parent compound, Fe 1+ x Te, of the iron chalcogenides by uniaxial strain. Iron telluride exhibits a peculiar (π, 0) antiferromagnetic order unlike the (π, π) order observed in the Fe-pnictide superconductors. The (π, 0) order is accompanied by a significant monoclinic distortion. We explore tuning of the ground state by uniaxial strain combined with low-temperature scanning tunneling microscopy. We demonstrate that, indeed under strain, the surface of Fe 1.1 Te undergoes a transition to a (π, π)-charge-ordered state. Comparison with transport experiments on uniaxially strained samples shows that this is a surface phase, demonstrating the opportunities afforded by 2D correlated phases stabilized near surfaces and interfaces.

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Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe

Cited by 9 publications

References 84 publications

Relating spin-polarized STM imaging and inelastic neutron scattering in the van-der-Waals ferromagnet Fe3GeTe2

Relating spin-polarized STM imaging and inelastic neutron scattering in the van-der-Waals ferromagnet Fe3GeTe2

Relating spin-polarized STM imaging and inelastic neutron scattering in the van der Waals ferromagnetFe3GeTe2

Strain-Stabilized (π, π) Order at the Surface of Fe_1+xTe

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Magnetic surface reconstruction in the van der Waals antiferromagnet Fe1+xTe

Cited by 9 publications

References 84 publications

Relating spin-polarized STM imaging and inelastic neutron scattering in the van-der-Waals ferromagnet Fe3GeTe2

Relating spin-polarized STM imaging and inelastic neutron scattering in the van-der-Waals ferromagnet Fe3GeTe2

Relating spin-polarized STM imaging and inelastic neutron scattering in the van der Waals ferromagnetFe3GeTe2

Strain-Stabilized (π, π) Order at the Surface of Fe1+xTe

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Strain-Stabilized (π, π) Order at the Surface of Fe_1+xTe