Martin Magnuson's webpage

Associate Professor/Biträdande Professor
Thin Film Physics Group, Department of Physics, Chemistry and Biology (IFM), Linköping - Sweden.

 

Resonant Inelastic X-ray Scattering (RIXS) and X-ray Fluorescence using Synchrotron Radiation

IFM webpage LiU web Publications at Diva LiU publications Publications in Mendeley Full text in arXiv Full text in Academia Kudos publ. Publons MS2E Post publ. Homepage at LiU Publications at CERN DS Albert Ask a Researcher at LiU Synchrotron Radiation Course Surface Physics, TFYA20 MAX IV Infrastructure Link to Science photos Link to s/y Gentiana Link to Art work Link to Photo page Google Scholar Citations Martin Magnuson

Martin Magnuson performing RIXS measurements at the ADRESS beamline at the Swiss Light Source (SLS), Villigen in 2015.The aim of this research area is to perform detailed investigations of the electronic structure and chemical bonding of specific materials. The studies are part of the generally application-inspired fundamental research at the Department of Physics, Chemistry and Biology (IFM) with processes, materials and phenomena that are also relevant to industry. Experimental work using advanced x-ray spectroscopies with synchrotron radiation is combined with integrated computational materials engineering. Materials of current interest are:

Research Tools

Experimental techniques

X-ray spectroscopy: soft x-ray absorption spectroscopy (XAS or SXA), X-ray Raman scattering or Soft x-ray emission spectroscopy (XES or SXE), Resonant inelastic x-ray scattering (RIXS), Extended X-ray Fine Structure Spectroscopy (EXAFS), X-ray Magnetic Circular Dichroism (XMCD). Most of the spectroscopic research is based on measurements at synchrotron radiation facilities.

Calculational methods

Density functional theory (Wien2k, Exciting, FEFF, CASTEP in Materials Modelling), Crystal-field, ligand-field and charge-transfer multiplet calculations in SIAM.

Funding

The Swedish Energy Agency (Energimyndigheten) and The Carl Tryggers Foundation (CTS).

Materials Science Research by Investigation of Electronic Structure and Chemical Bonding

MAX-phases and MXenes

A prominent example of interesting nanolaminates are the so-called MAX-phases, which are either hexagonal ternary carbides or nitrides. The MAX-phases are known to exhibit a remarkable combination of chemical, physical and mechanical properties including e.g., high electrical and thermal conductivity, high strength, high dissociation temperature, corrosion resistance, low friction, resistance to thermal shock and easy machinability. Another objective is to investigate the anisotropy characteristics in the electronic structure of so-called MXenes, a new family of 2D ceramic crystals related to MAX-phases.

Amorphous carbides

The objective of this work is to investigate the electronic structure in amorphous nanocomposite carbides and metallic glasses. A differentiation between the largely unknown electronic occupation of orbitals and bond strengths in octahedral and prismatic coordination in the interior of amorphous nanocomposites in comparison to single crystal materials using bulk-sensitive and element-selective x-ray spectroscopies are made. The knowledge aims to facilitate synthesis of novel amorphous materials and metallic glasses for hard coatings and electrical contacts on the atomic scale, and also serve as important tests of stochastic quenching density functional theory (SQ-DFT) and molecular dynamics (MD) simulations, enabling development of improved theoretical methods.

Wide band-gap nitrides and strongly correlated materials

This research aims to explore the development of the width of the band-gap and anisotropy in the electronic structure of wide band-gap nitrides by investigating the hybridization and orbital overlap of the containing elements. The investigations have impact on future studies on other complex doped, ordered, and alloyed systems, e.g., temperature-dependent low-energy excitations and charge-transfer mechanisms and related inherently nano-laminated materials with temperature-dependent orbital occupations. Another objective is to explore low-energy excitations and charge-transfer processes in strongly correlated systems such as H-Tc superconductors and Colossal Magnetoresistance materials. The temperature-induced metal-insulator phase transitions and changes in the electronic structures at phase transitions are studied. The studies have impact on the fundamental understanding of electron correlations in relation to crystallographic direction-dependent physical properties such as conductivity.

Recent publications

  1. Reactive magnetron sputtering of tungsten target in krypton/trimethylboron atmosphere
    Martin Magnuson, Lina Tengdelius, Fredrik Eriksson, Mattias Samuelsson, Esteban Broitman, Grzegorz Greczynski, Lars Hultman, and Hans Högberg;
    Thin Solid Films
    686, Accepted, in press (2019). DOI: 10.1016/j.tsf.2019.06.034
    Full text in TSF
  2. Vibrational Effects in X-ray Absorption Spectra of 2D Layered Materials
    Weine Olovsson, Teruyasu Mizoguchi, Martin Magnuson, Stefan Kontur, Olle Hellman, Isao Tanaka, and Claudia Draxl;
    J. Phys. Chem. C
    123, 9688-96 (2019). DOI: 10.1021/acs.jpcc.9b00179
    Full text in DiVA Full text in JPCC Full text in ArXiV Kudos
  3. Compositional dependence of epitaxial Tin+1SiCn MAX-phase thin films grown from a Ti3SiC2 compound target
    Martin Magnuson, Lina Tengdelius, Grzegorz Greczynski, Fredrik Eriksson, Jens Jensen, Jun Lu, Mattias Samuelsson, Per Eklund, Lars Hultman, Hans Högberg;
    J. Vac. Sci. Technol. A.
    37, 021506 (2019). DOI: https://doi.org/10.1116/1.5065468
    Full text in DiVA Full text in JVSTA Full text in ArXiV Researchgate Mendeley Post Publ. Kudos
  4. Electronic Structure of β-Ta Films from X-ray Photoelectron Spectroscopy and First-principles Calculations
    Martin Magnuson, Grzegorz Greczynski, Fredrik Eriksson, Lars Hultman, and Hans Högberg;
    Applied Surface Science
    470, 607-612 (2019). DOI: https://doi.org/10.1016/j.apsusc.2018.11.096
    Full text in DiVA Full text in ASS Full text in ArXiV Researchgate Mendeley Post Publ. Kudos
  5. Chemical Bonding in Carbide MXene Nanosheets
    Martin Magnuson, Joseph Halim and Lars-Åke Näslund;
    J. Elec. Spec.
    224, 27-32 (2018). DOI: https://doi.org/10.1016/j.elspec.2017.09.006
    Full text in DiVA Full text in JES Full text in ArXiV Researchgate Mendeley Post Publ. Kudos
  6. Polarization-Dependent Resonant Inelastic X-ray Scattering Study at the Cu L and O K-Edges of YBa2Cu3O7-x
    Martin Magnuson, Thorsten Schmitt and Laurent C. Duda;
    J. Elec. Spec.
    224, 38-44 (2018). DOI:https://doi.org/10.1016/j.elspec.2017.07.005
    Full text in DiVA LiU Full text in DiVA UU Full text in JES Full text in ArXiV Researchgate Mendeley Post Publ.