A5079990712- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Graphene research and applications
- 2D Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Surface and Thin Film Phenomena
- Magnetic Properties and Applications
- Molecular Junctions and Nanostructures
- Magneto-Optical Properties and Applications
- Multiferroics and related materials
- Magnetic Field Sensors Techniques
- ZnO doping and properties
- Quantum many-body systems
- Advanced Memory and Neural Computing
- Magnetism in coordination complexes
- Advanced Chemical Physics Studies
- Heusler alloys: electronic and magnetic properties
- Electron and X-Ray Spectroscopy Techniques
- Theoretical and Computational Physics
- Quantum optics and atomic interactions
- Inorganic Fluorides and Related Compounds
Forschungszentrum Jülich
2016-2025
Johannes Gutenberg University Mainz
2018-2025
Czech Academy of Sciences, Institute of Physics
2025
Max Planck Graduate Center
2025
University of Applied Sciences Mainz
2018-2021
Savitribai Phule Pune University
2014
Max Planck Institute for Solid State Research
2014
Jülich Aachen Research Alliance
2011-2013
Kiel University
2012
Universität Hamburg
2006-2009
Manipulating a stubborn magnet Spintronics is an alternative to conventional electronics, based on using the electron's spin rather than its charge. Spintronic devices, such as magnetic memory, have traditionally used ferromagnetic materials encode 1's and 0's of binary code. A weakness this approach—that strong fields can erase encoded information—could be avoided by antiferromagnets instead ferromagnets. But manipulating ordering tricky. Now, Wadley et al. found way (see Perspective...
Abstract W annier90 is an open-source computer program for calculating maximally-localised Wannier functions (MLWFs) from a set of Bloch states. It interfaced to many widely used electronic-structure codes thanks its independence the basis sets representing these In past few years development has transitioned community-driven model; this resulted in number new developments that have been recently released v3.0. article we describe functionalities, include implementation features...
We investigate four CuAu-I-type metallic antiferromagnets for their potential as spin current detectors using pumping and inverse Hall effect. Nontrivial effects were observed FeMn, PdMn, IrMn while a much higher effect was obtained PtMn. Using thickness-dependent measurements, we determined the diffusion lengths of these materials to be short, on order 1 nm. The estimated angles follow relationship PtMn>IrMn>PdMn>FeMn, highlighting correlation between spin-orbit coupling nonmagnetic species...
Based on first-principles calculations, we predict that $5d$ transition metals graphene present a unique class of hybrid systems exhibiting topological transport effects can be manipulated effectively by external electric fields. The origin this phenomenon lies in the exceptional magnetic properties and large spin-orbit interaction leading to significant moments accompanied with colossal magnetocrystalline anisotropy energies. A strong magnetoelectric response is predicted offers possibility...
Current-induced spin-orbit torques (SOTs) allow for the efficient electrical manipulation of magnetism in spintronic devices. Engineering SOT efficiency is a key goal that pursued by maximizing active interfacial spin accumulation or modulating nonequilibrium density builds up through Hall and inverse galvanic effects. Regardless origin, fundamental requirement generation current-induced net accumulation. We report on large enhancement thulium iron garnet (TmIG)/Pt capping with...
Spin Hall effect, an electric generation of spin current, allows for efficient control magnetization. Recent theory revealed that orbital effect creates which can be much larger than Hall-induced current. However, current cannot directly exert a torque on ferromagnet, requiring conversion process from to Here, we report two effective methods the through spin-orbit coupling engineering, us unambiguously demonstrate orbital-current-induced torque, or torque. We find is greatly enhanced by...
We report the observation of magnetoresistance (MR) that could originate from orbital angular momentum (OAM) transport in a permalloy (Py)/oxidized Cu (Cu^{*}) heterostructure: Rashba-Edelstein magnetoresistance. The dependence MR depends on relative angle between induced OAM and magnetization similar fashion as spin Hall Despite absence elements with large spin-orbit coupling, we find sizable ratio, which is contrast to conventional requires heavy elements. Through Py thickness-dependence...
Abstract Modern spintronics relies on the generation of spin currents through spin-orbit coupling. The spin-current has been believed to be triggered by current-induced orbital dynamics, which governs angular momentum transfer from lattice electrons in solids. fundamental role response dynamics suggests importance counterpart currents: currents. However, evidence for its existence elusive. Here, we demonstrate giant and uncover features response. We experimentally theoretically show that...
We demonstrate the emergence of a pronounced thermal transport in recently discovered class magnetic materials—altermagnets. From symmetry arguments and first-principles calculations performed for showcase altermagnet, RuO2, we uncover that crystal Nernst Hall effects this material are very large strongly anisotropic with respect to Néel vector. find originate from three sources Berry's curvature momentum space: Weyl fermions due crossings between well-separated bands, strong spin-flip...
Abstract The emerging field of orbitronics exploits the electron orbital momentum L . Compared to spin-polarized electrons, may allow transfer magnetic information with considerably higher density over longer distances in more materials. However, direct experimental observation currents, their extended propagation lengths and conversion into charge currents has remained challenging. Here, we optically trigger ultrafast angular-momentum transport Ni|W|SiO 2 thin-film stacks. resulting...
We report and quantify a large orbital-Hall torque generated by Nb Ru, which we identify from strong dependence of torques on the ferromagnets. This is manifested as sign reversal enhancement in damping-like measured (or Ru)/Ni bilayers compared to Ru)/FeCoB bilayers. The long-range nature orbital transport ferromagnet revealed thickness dependences Ni are markedly different regular spin absorption that takes place within few angstroms thus it uniquely distinguishes Hall torque.
While it is often assumed that the orbital response suppressed and short ranged due to strong crystal field potential quenching, we show can be remarkably long in ferromagnets. In a bilayer consisting of nonmagnet ferromagnet, spin injection from interface results accumulation torque which rapidly oscillate decay by dephasing. contrast, even when an external electric applied only on nonmagnet, find substantially long-ranged induced angular momentum go far beyond dephasing length. This...
Abstract Recent developments have introduced a groundbreaking form of collinear magnetism known as “altermagnetism”. This emerging magnetic phase is characterized by robust time‐reversal symmetry breaking, antiparallel order, and alternating spin‐splitting band structures, yet it exhibits vanishing net magnetization constrained symmetry. Altermagnetism uniquely integrates traits previously considered mutually exclusive to conventional ferromagnetism antiferromagnetism, thereby facilitating...
An applied electric current through a space-inversion asymmetric magnet induces spin-orbit torques (SOTs) on the magnetic moments, which holds much promise for future memory devices. We discuss general Green's function expressions suitable to compute linear-response SOT in disordered ferromagnets. The can be decomposed into an even and odd component with respect magnetization reversal, where limit of vanishing disorder is given by constant Berry curvature occupied states, while part exhibits...
Vector spin chirality is one of the fundamental characteristics complex magnets. For a one-dimensional spin-spiral state it can be interpreted as handedness, or rotational sense spiral. Here, using spin-polarized scanning tunneling microscopy, we demonstrate occurrence an atomic-scale spiral in finite individual bi-atomic Fe chains on (5×1)-Ir(001) surface. We show that broken inversion symmetry at surface promotes direction vector chirality, leading to unique all chains. Correspondingly,...
We report on the implementation of Wannier Functions (WFs) formalism within full-potential linearized augmented plane-wave method (FLAPW), suitable for bulk, film, and one-dimensional geometries. The details implementation, as well results metallic ${\text{SrVO}}_{3}$, ferroelectric ${\text{BaTiO}}_{3}$ grown ${\text{SrTiO}}_{3}$, covalently bonded graphene a Pt chain are given. discuss effect spin-orbit coupling cases ${\text{SrVO}}_{3}$ platinum. dependency WFs choice localized trial...
One of the main obstacles that prevents practical applications antiferromagnets is difficulty manipulating magnetic order parameter. Recently, following theoretical prediction [J. \ifmmode \check{Z}\else \v{Z}\fi{}elezn\'y et al., Phys. Rev. Lett. 113, 157201 (2014)], electrical switching moments in an antiferromagnet was demonstrated [P. Wadley Science 351, 587 (2016)]. The due to so-called spin-orbit torque, which has been extensively studied ferromagnets. In this phenomena a...
Motivated by the importance of understanding competing mechanisms to current-induced spin-orbit torque in complex magnets, we develop a unified theory spin-orbital coupled dynamics. The describes angular momentum transfer between different degrees freedom solids, e.g., electron orbital and spin, crystal lattice, magnetic order parameter. Based on continuity equations for spin momenta, derive motion that relate current fluxes torques describing freedom. We then propose classification scheme...
Abstract Two hundred years ago, Ampère discovered that electric loops in which currents of electrons are generated by a penetrating magnetic field can mutually interact. Here we show Ampère’s observation be transferred to the quantum realm interactions between triangular plaquettes spins on lattice, where electrical at atomic scale associated with orbital motion response non-coplanarity neighbouring playing role field. The resulting topological moment underlies relation dynamics topology...