Magnetic Contrast at Spin-Flip Excitations: An Advanced X-Ray Spectroscopy Tool to Study Magnetic-Ordering

Elnaggar, Hebatalla; Wang, Ru‐Pan; Lafuerza, Sara; Paris, E.; Tseng, Yi; McNally, Daniel; Komarek, A. C.; Haverkort, M. W.; Sikora, Marcin; Schmitt, Thorsten; Groot, Frank M. F. de

doi:10.1021/acsami.9b10196

Cited by 18 publications

(9 citation statements)

References 55 publications

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“…The experimental XMCD signal of Fe 3 O 4 is shown in Figure 2a. The spectral shape is consistent with previously reported measurements [37][38][39][40][41] . A detailed comparison between XMCD measurements of the thin-film and bulk Fe 3 O 4 is presented in Figure S9.…”

Section: A Limitations Of Xmcd In Mixed Valence Systemssupporting

confidence: 92%

Probing the local distortion of Fe sites in Fe3O4 thin films using enhanced symmetry selection in XMLD

Elnaggar¹,

Wang²,

Ghiasi³

et al. 2020

Phys. Rev. Materials

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Magnetite (Fe3O4) thin-films are among the most stimulating systems for electronic applications, in particular given that their electric and magnetic properties can be controlled by substrate strain.Here we investigate the electronic structure of a 38 nm Fe3O4/SrTiO3 (001) thin-film by a unique set of X-ray magnetic linear dichroism (XMLD) measurements. We show that it is only possible to uncover the orbital character of the Fe sites in Fe3O4 by a systematic analysis of the XMLD angular distribution. The local symmetry of the Fe 2+ B site in the thin-film is found to be trigonally distorted. Our results highlight that the combination of state-of-the-art XMLD measurements and theoretical simulations is indispensable for investigating the electronic structure of oxide thin-films and heterostructures.

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Section: A Limitations Of Xmcd In Mixed Valence Systemssupporting

confidence: 92%

Probing the local distortion of Fe sites in Fe3O4 thin films using enhanced symmetry selection in XMLD

Elnaggar¹,

Wang²,

Ghiasi³

et al. 2020

Phys. Rev. Materials

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“…RIXS is furthermore helpful when there is need to study the valence electronic structure as it probes the charge-neutral, dipole-forbidden, dd -excitations of a system, enabling to reconstruct its ground-state energy levels [26][27][28][29][30][31] . In particular, for 3d elements, such excitations can be accessed using the L 3 edge resonance in the soft x-ray range, promoting electrons from the 2p 3/2 core states to the 3d valence states.…”

Section: Resultsmentioning

confidence: 99%

Site-specific electronic and magnetic excitations of the skyrmion material Cu$_2$OSeO$_3$

Gu,

Wang,

Lin

et al. 2022

Preprint

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The manifestation of skyrmions in the Mott-insulator Cu 2 OSeO 3 originates from a delicate balance between magnetic and electronic energy scales. As a result of these intertwined couplings, the two symmetry-inequivalent magnetic ions, Cu-I and Cu-II, bond into a spin S=1 entangled tetrahedron. However, conceptualizing the unconventional properties of this material and the energy of the competing interactions is a challenging task due the complexity of this system. Here we combine X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering to uncover the electronic and magnetic excitations of Cu 2 OSeO 3 with site-specificity. We quantify the energies of the 3d crystal-field splitting for both Cu-I and Cu-II, fundamental to optimize model Hamiltonians. Additionally, we unveil a site-specific magnetic mode, indicating that individual spin character is preserved within the entangled-tetrahedron picture.Our results thus provide experimental constraint for validating theories that describe the interactions of Cu 2 OSeO 3 , highlighting the site-selective capabilities of resonant spectroscopies.

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“…Hence, CD in RIXS (CD-RIXS) provides an unprecedented probe for the chirality of the electronic wavefunction and the breaking of time-reversal symmetry. While CD-RIXS has been used to study magnetic materials [28][29][30][31][32] or spin-flip processes [33] in the spirit of X-ray magnetic CD, the link between the local OAM texture and CD-RIXS has not been explored.…”

Section: Introductionmentioning

confidence: 99%

Probing magnetic orbitals and Berry curvature with circular dichroism in resonant inelastic X-ray scattering

Schüler¹,

Schmitt²,

Werner³

2022

Preprint

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Resonant inelastic X-ray scattering (RIXS) can probe localized excitations at selected atoms in materials, including particle-hole transitions from valence to the conduction bands. These transitions are governed by fundamental properties of the corresponding Bloch wave-functions, including orbital and magnetic degrees of freedom, and quantum geometric properties such as the Berry curvature. In particular, orbital angular momentum (OAM), which is closely linked to the Berry curvature, can exhibit a nontrivial momentum dependence. We demonstrate how information on such OAM textures can be extracted from the circular dichroism in RIXS. Based on accurate modeling with first-principles treatment of the key ingredient -the light-matter interaction -we simulate dichroic RIXS spectra for the prototypical transition metal dichalcogenide MoSe 2 and the twodimensional topological insulator 1T ′ -MoS 2 . Guided by an intuitive picture for the optical selection rules, we discuss how the momentum-dependent OAM manifests itself in the dichroic RIXS signal if one controls the momentum transfer. Our calculations are performed for typical experimental geometries and parameter regimes, and demonstrate the possibility of observing the predicted circular dichroism in forthcoming experiments.

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Magnetic Contrast at Spin-Flip Excitations: An Advanced X-Ray Spectroscopy Tool to Study Magnetic-Ordering

Cited by 18 publications

References 55 publications

Probing the local distortion of Fe sites in Fe3O4 thin films using enhanced symmetry selection in XMLD

Probing the local distortion of Fe sites in Fe3O4 thin films using enhanced symmetry selection in XMLD

Site-specific electronic and magnetic excitations of the skyrmion material Cu$_2$OSeO$_3$

Probing magnetic orbitals and Berry curvature with circular dichroism in resonant inelastic X-ray scattering

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