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  1. AU="Dupé, Bertrand"
  2. AU="Morello, Rémy"
  3. AU="Payrastre, Laurence"
  4. AU="Pereira, Duane G"
  5. AU="Cristofaro, Rosa Carmela"
  6. AU="Wan, Xiaolin"
  7. AU="Renfu, Chen"
  8. AU="Pisani, Antonio Rosario"
  9. AU=Zhang Yue-Miao AU=Zhang Yue-Miao
  10. AU="Chen, Z P"
  11. AU="Pinzón-Navarro, Beatriz Adriana"
  12. AU="Dong, Chuan-Ding"
  13. AU="Gomes, Rafael"
  14. AU="Goncin, Una"
  15. AU="Chen, Yan-Nan"
  16. AU="Revuelta, Belen"
  17. AU="Parmar, Dharati"
  18. AU="Herrera-Mateo, Sergio"
  19. AU="Fejes, I"
  20. AU="Zhang, Zhuhua"
  21. AU="Taillé, C"
  22. AU="San Martín, Juan Víctor"
  23. AU=Sun Yi AU=Sun Yi
  24. AU="Wu, Changping"
  25. AU="Polette, Myriam"
  26. AU="Ian D. Hickson"
  27. AU="Raasch, Siegfried"
  28. AU="Liu, Miao-Miao"
  29. AU="Beschastnov, V V"
  30. AU="Mehdi Benamar"
  31. AU="Manzoor, Jaida"

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Suchoptionen

  1. Buch ; Online: Unravelling the role of Sm 4f electrons in the magnetism of SmFeO$_3$

    Amoroso, Danila / Dupe, Bertrand / Verstraete, Matthieu J.

    2022  

    Abstract: Magnetic rare-earth orthoferrites $R$FeO$_3$ host a variety of functional properties from multiferroicity and strong magnetostriction, to spin-reorientation transitions and ultrafast light-driven manipulation of magnetism, which can be exploited in ... ...

    Abstract Magnetic rare-earth orthoferrites $R$FeO$_3$ host a variety of functional properties from multiferroicity and strong magnetostriction, to spin-reorientation transitions and ultrafast light-driven manipulation of magnetism, which can be exploited in spintronics and next-generation devices. Among these systems, SmFeO$_3$ is attracting a particular interest for its rich phase diagram and the high temperature Fe-spin magnetic transitions, which combines with a very low temperature and as yet unclear Sm-spin ordering. Various experiments suggest that the interaction between the Sm and Fe magnetic moments (further supported by the magnetic anisotropy), is at the origin of the complex cascade of transitions, but a conclusive and clear picture has not yet been reached. In this work, by means of comprehensive first-principles calculations, we unravel the role of the magnetic Sm ions in the Fe-spin reorientation transition and in the detected anomalies in the lattice vibrational spectrum, which are a signature of a relevant spin-phonon coupling. By including both Sm-$f$ electrons and non-collinear magnetism, we find frustrated and anisotropic Sm interactions, and a large magnetocrystalline anisotropy mediated by the SOC of the Sm-$4f$ electrons, which drive the complex magnetic properties and phase diagram of SmFeO$_3$.
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2022-11-24
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  2. Buch ; Online: Spin-current driven Dzyaloshinskii-Moriya interaction in the multiferroic BiFeO3 from first-principles

    Meyer, Sebastian / Xu, Bin / Verstraete, Matthieu / Bellaiche, Laurent / Dupé, Bertrand

    2022  

    Abstract: The electrical control of magnons opens up new ways to transport and process information for logic devices. In magnetoelectrical multiferroics, the Dzyaloshinskii-Moriya (DM) interaction directly allow for such a control and, hence, is of major ... ...

    Abstract The electrical control of magnons opens up new ways to transport and process information for logic devices. In magnetoelectrical multiferroics, the Dzyaloshinskii-Moriya (DM) interaction directly allow for such a control and, hence, is of major importance. We determine the origin and the strength of the (converse) spin current DM interaction in the R3c bulk phase of the multiferroic BiFeO3 based on density functional theory. Our data supports only the existence of one DM interaction contribution originating from the spin current model. By exploring then magnon dispersion in the full Brillouin Zone, we show that the exchange is isotropic, but the DM interaction and anisotropy prefer any propagation and any magnetization direction within the full (111) plane. Our work emphasizes the significance of the asymmetric potential induced by the spin current over the structural asymmetry induced by the anionic octahedron in multiferroics such as BiFeO3.
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Other Condensed Matter
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2022-10-27
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  3. Buch ; Online: Observation of the sliding phason mode of the incommensurate magnetic texture in Fe/Ir(111)

    Yang, Hung-Hsiang / Desplat, Louise / Kravchuk, Volodymyr P. / Hervé, Marie / Balashov, Timofey / Gerber, Simon / Garst, Markus / Dupé, Bertrand / Wulfhekel, Wulf

    2023  

    Abstract: The nanoscopic magnetic texture forming in a monolayer of iron on the (111) surface of iridium, Fe/Ir(111), is spatially modulated and uniaxially incommensurate with respect to the crystallographic periodicities. As a consequence, a low-energy magnetic ... ...

    Abstract The nanoscopic magnetic texture forming in a monolayer of iron on the (111) surface of iridium, Fe/Ir(111), is spatially modulated and uniaxially incommensurate with respect to the crystallographic periodicities. As a consequence, a low-energy magnetic excitation is expected that corresponds to the sliding of the texture along the incommensurate direction, i.e., a phason mode, which we explicitly confirm with atomistic spin simulations. Using scanning tunneling microscopy (STM), we succeed to observe this phason mode experimentally. It can be excited by the STM tip, which leads to a random telegraph noise in the tunneling current that we attribute to the presence of two minima in the phason potential due to the presence of disorder in our sample. This provides the prospect of a floating phase in cleaner samples and, potentially, a commensurate-incommensurate transition as a function of external control parameters.

    Comment: 6 Figures
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Mesoscale and Nanoscale Physics
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2023-10-30
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    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Buch ; Online: Impact of Spin-Orbit Coupling on Quantum Transport in Magnetic Tunnel Junction with an anti-ferromagnetic Capping Layer

    Koli, Shradha Chandrashekhar / Zhou, Hangyu / Zhou, Jiaqi / Dupé, Bertrand / Zhao, Weisheng

    2021  

    Abstract: Using first-principles calculations, we explore the role of an anti-ferromagnetic heavy-metal, L1$_0$-IrMn, as a capping layer in a perpendicular magnetic tunnel junction (\emph{p}-MTJ). A comparative study is conducted by employing conventional non- ... ...

    Abstract Using first-principles calculations, we explore the role of an anti-ferromagnetic heavy-metal, L1$_0$-IrMn, as a capping layer in a perpendicular magnetic tunnel junction (\emph{p}-MTJ). A comparative study is conducted by employing conventional non-magnetic heavy-metals (Ta, W or Mo) capping layers along with an anti-ferromagnetic IrMn in a symmetric-MTJ X/FeCo/MgO/FeCo/X, where X=Ta, W, Mo or IrMn. Firstly, the calculations without including spin-orbit coupling (SOC) are presented where the highest TMR is achieved in IrMn-IrMn MTJ compared to that of Ta-Ta, W-W and Mo-Mo MTJs. The origin of this large TMR is attributed to, both, the large spin-polarization due to reduced lattice-mismatch and the non-identical signatures of both the anti-parallel conduction-channels caused by the anti-ferromagnetic ordering of IrMn that reflects the spins at IrMn/FeCo interface. Moreover, when SOC is switched-on, the increase of TMR is observed in all the MTJs with a particularly giant enhancement in IrMn-IrMn MTJ. This SOC-induced increase in TMR is ascribed to the mixed contribution of $\Delta_1$ and $\Delta_5$ states and the additional increase in the band levels of the out-of-plane orbitals, \emph{p}$_z$, \emph{d}$_{z}^2$ and \emph{d}$_{xz}$ due to the lifting of degeneracy. Furthermore, it was also observed that the lattice-mismatch-induced strain might create an orbital reconstruction within the capping layer, probably, due to the crystallographic deformation and, in turn, in the adjacent FeCo-electrode. This microscopic mechanism also plays an additional decisive role in enhancing the TMR. Finally, our results indicate that IrMn can offer giant TMR in future spin-orbit toque (SOT) based MRAM devices with a straightforward design strategy.
    Schlagwörter Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2021-09-28
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    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Buch ; Online: The role of band matching in the proximity effect between a superconductor and a normal metal

    Mougel, Loic / Buhl, Patrick M. / Li, Qili / Müller, Anika / Yang, Hung-Hsiang / Verstraete, Matthieu / Simon, Pascal / Dupé, Bertrand / Wulfhekel, Wulf

    2022  

    Abstract: We combine density functional theory and scanning tunneling microscopy to study the proximity effects between a bulk Ru(0001) superconductor and an atomically thin overlayer of Co. We have identified that the Co monolayer can grow in two different ... ...

    Abstract We combine density functional theory and scanning tunneling microscopy to study the proximity effects between a bulk Ru(0001) superconductor and an atomically thin overlayer of Co. We have identified that the Co monolayer can grow in two different stackings: the hcp and a reconstructed \textepsilon-like stacking. We analyze their electronic structure from both experiments and density functional theory. While the magnetic hcp stacking shows a weak proximity effect in combination with Shiba states and with almost no suppression of superconductivity of the substrate, the more complex \textepsilon-like stacking becomes almost fully superconducting and displays an edge state at the island rim. We identify this edge state as a trivial state caused by a local hcp rim around the \textepsilon-core. We explain the weak proximity effect between Ru and the magnetic hcp islands by a low transparency of the interface, while the large chemical unit cell of the non-magnetic \textepsilon-like stacking lifts the momentum conservation at the interface making it transparent and causing a clear proximity effect.
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Superconductivity
    Erscheinungsdatum 2022-03-02
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  6. Buch ; Online: Asymmetric skyrmion-antiskyrmion production in ultrathin ferromagnetic films

    Ritzmann, Ulrike / Desplat, Louise / Dupé, Bertrand / Camley, Robert E. / Kim, Joo-Von

    2020  

    Abstract: Ultrathin ferromagnets with frustrated exchange and the Dzyaloshinskii-Moriya interaction can support topological solitons such as skyrmions and antiskyrmions, which are metastable and can be considered particle-antiparticle counterparts. When spin-orbit ...

    Abstract Ultrathin ferromagnets with frustrated exchange and the Dzyaloshinskii-Moriya interaction can support topological solitons such as skyrmions and antiskyrmions, which are metastable and can be considered particle-antiparticle counterparts. When spin-orbit torques are applied, the motion of an isolated antiskyrmion driven beyond its Walker limit can generate skyrmion-antiskyrmion pairs. Here, we use atomistic spin dynamics simulations to shed light on the scattering processes involved in this pair generation. Under certain conditions a proliferation of these particles and antiparticles can appear with a growth rate and production asymmetry that depend on the strength of the chiral interactions and the dissipative component of the spin-orbit torques. These features are largely determined by scattering processes between antiskyrmions, which can be elastic or result in bound states or annihilation.

    Comment: 7 pages, 6 figures
    Schlagwörter Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2020-07-21
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  7. Buch ; Online: Effects of Pressure on the Electronic and Magnetic Properties of Bulk NiI$_{2}$

    Kapeghian, Jesse / Amoroso, Danila / Occhialini, Connor A. / Martins, Luiz G. P. / Song, Qian / Smith, Jesse S. / Sanchez, Joshua J. / Kong, Jing / Comin, Riccardo / Barone, Paolo / Dupé, Bertrand / Verstraete, Matthieu J. / Botana, Antia S.

    2023  

    Abstract: Transition metal dihalides have recently garnered interest in the context of two-dimensional van der Waals magnets as their underlying geometrically frustrated triangular lattice leads to interesting competing exchange interactions. In particular, NiI$_{ ... ...

    Abstract Transition metal dihalides have recently garnered interest in the context of two-dimensional van der Waals magnets as their underlying geometrically frustrated triangular lattice leads to interesting competing exchange interactions. In particular, NiI$_{2}$ is a magnetic semiconductor that has been long known for its exotic helimagnetism in the bulk. Recent experiments have shown that the helimagnetic state survives down to the monolayer limit with a layer-dependent magnetic transition temperature that suggests a relevant role of the interlayer coupling. Here, we explore the effects of hydrostatic pressure as a means to enhance this interlayer exchange and ultimately tune the electronic and magnetic response of NiI$_{2}$. We study first the evolution of the structural parameters as a function of external pressure using first-principles calculations combined with x-ray diffraction measurements. We then examine the evolution of the electronic structure and magnetic exchange interactions via first-principles calculations and Monte Carlo simulations. We find that the leading interlayer coupling is an antiferromagnetic second-nearest neighbor interaction that increases monotonically with pressure. The ratio between isotropic third- and first-nearest neighbor intralayer exchanges, which controls the magnetic frustration and determines the magnetic propagation vector $\mathbf{q}$ of the helimagnetic ground state, is also enhanced by pressure. As a consequence, our Monte Carlo simulations show a monotonic increase in the magnetic transition temperature, indicating that pressure is an effective means to tune the magnetic response of NiI$_{2}$.
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2023-06-07
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    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Buch ; Online: Signatures of pressure-enhanced helimagnetic order in van der Waals multiferroic NiI$_2$

    Occhialini, Connor A. / Martins, Luiz G. P. / Song, Qian / Smith, Jesse S. / Kapeghian, Jesse / Amoroso, Danila / Sanchez, Joshua J. / Barone, Paolo / Dupé, Bertrand / Verstraete, Matthieu j. / Kong, Jing / Botana, Antia S. / Comin, Riccardo

    2023  

    Abstract: The van der Waals (vdW) type-II multiferroic NiI$_2$ has emerged as a candidate for exploring non-collinear magnetism and magnetoelectric effects in the 2D limit. Frustrated intralayer exchange interactions on a triangular lattice result in a ... ...

    Abstract The van der Waals (vdW) type-II multiferroic NiI$_2$ has emerged as a candidate for exploring non-collinear magnetism and magnetoelectric effects in the 2D limit. Frustrated intralayer exchange interactions on a triangular lattice result in a helimagnetic ground state, with spin-induced improper ferroelectricity stabilized by the interlayer interactions. Here we investigate the magnetic and structural phase transitions in bulk NiI$_2$, using high-pressure Raman spectroscopy, optical linear dichroism, and x-ray diffraction. We obtain evidence for a significant pressure enhancement of the antiferromagnetic and helimagnetic transition temperatures, at rates of $\sim15.3/14.4$ K/GPa, respectively. These enhancements are attributed to a cooperative effect of pressure-enhanced interlayer and third-nearest-neighbor intralayer exchange. These results reveal a general path for obtaining high-temperature type-II multiferroicity via high pressures in vdW materials.
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2023-06-20
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    Dokumenttyp Buch ; Online
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  9. Artikel ; Online: Tailoring magnetic skyrmions in ultra-thin transition metal films.

    Dupé, Bertrand / Hoffmann, Markus / Paillard, Charles / Heinze, Stefan

    Nature communications

    2014  Band 5, Seite(n) 4030

    Abstract: Skyrmions in magnetic materials offer attractive perspectives for future spintronic applications since they are topologically stabilized spin structures on the nanometre scale, which can be manipulated with electric current densities that are by orders ... ...

    Abstract Skyrmions in magnetic materials offer attractive perspectives for future spintronic applications since they are topologically stabilized spin structures on the nanometre scale, which can be manipulated with electric current densities that are by orders of magnitude lower than those required for moving domain walls. So far, they were restricted to bulk magnets with a particular chiral crystal symmetry greatly limiting the number of available systems and the adjustability of their properties. Recently, it has been experimentally discovered that magnetic skyrmion phases can also occur in ultra-thin transition metal films at surfaces. Here we present an understanding of skyrmions in such systems based on first-principles electronic structure theory. We demonstrate that the properties of magnetic skyrmions at transition metal interfaces such as their diameter and their stability can be tuned by the structure and composition of the interface and that a description beyond a micromagnetic model is required in such systems.
    Sprache Englisch
    Erscheinungsdatum 2014-06-04
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms5030
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Buch ; Online: Engineering the dynamics of topological spin textures by anisotropic spin-orbit torques

    Hanke, Jan-Philipp / Freimuth, Frank / Dupé, Bertrand / Sinova, Jairo / Kläui, Mathias / Mokrousov, Yuriy

    2019  

    Abstract: Integrating topologically stabilized magnetic textures such as skyrmions as nanoscale information carriers into future technologies requires the reliable control by electric currents. Here, we uncover that the relevant skyrmion Hall effect, which ... ...

    Abstract Integrating topologically stabilized magnetic textures such as skyrmions as nanoscale information carriers into future technologies requires the reliable control by electric currents. Here, we uncover that the relevant skyrmion Hall effect, which describes the deflection of moving skyrmions from the current flow direction, acquires important corrections owing to anisotropic spin-orbit torques that alter the dynamics of topological spin structures. Thereby, we propose a viable means for manipulating the current-induced motion of skyrmions and antiskyrmions. Based on these insights, we demonstrate by first-principles calculations and symmetry arguments that the motion of spin textures can be tailored by materials design in magnetic multilayers of Ir/Co/Pt and Au/Co/Pt. Our work advances the understanding of the current-induced dynamics of these magnetic textures, which underlies a plethora of memory and logic applications.

    Comment: 8 pages, 5 figures
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Mesoscale and Nanoscale Physics
    Thema/Rubrik (Code) 629
    Erscheinungsdatum 2019-11-05
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    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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