Visualization of magnetism in the band structure
Magnetization direction M acts as an additionl degree of freedom that can influence topological properties of magnetic materials. Rotating M typically controls opening and closing numerous gaps due to spin-orbit coupling, and these gaps control the intrinsic contribution of the magnetotransport. Our experiments image spin-polarized band structure at high resolution, visualize such M-dependent gaps.
We focus primarily on properties of Fe(001) thin films, which are a model system for studying interplay between the band structure and magnetotransport. We establish high quality Fe/Au(001) epitaxial system. We demonstrate M direction-dependent gaps in this system, using high-resolution spin-polarized ARPES.
We also studied temperature dependence of the spin-polarized spectra of EuO thin films, where we demonstrated the spin-polarization in the O 2p levels (induced by the Eu 4f local moments) and its decay when approaching the Curie temperature.
Publications
E. Młyńczak, I. Aguilera, P. Gospodarič, T. Heider, M. Jugovac, G. Zamborlini, J.-P. Hanke, C. Friedrich, Y. Mokrousov, C. Tusche, S. Suga, V. Feyer, S. Blügel, L. Plucinski, and C. M. Schneider, “Fe(001) angle-resolved photoemission and intrinsic anomalous Hall conductivity in Fe seen by different ab initio approaches: LDA and GGA versus GW”, Phys. Rev. B 105, 115135 (2022), https://doi.org/10.1103/PhysRevB.105.115135
Tristan Heider, Timm Gerber, Okan Köksal, Markus Eschbach, Ewa Młyńczak, Patrick Lömker, Pika Gospodaric, Mathias Gehlmann, Moritz Plötzing, Rossitza Pentcheva, Lukasz Plucinski, Claus M. Schneider, and Martina Müller, “Temperature-dependent spin-resolved electronic structure of EuO thin films”, Phys. Rev. B 106, 054424 (2022), https://doi.org/10.1103/PhysRevB.106.054424
E. Młyńczak, I. Aguilera, P. Gospodarič, T. Heider, M. Jugovac, G. Zamborlini, C. Tusche, S. Suga, V. Feyer, S. Blügel, L. Plucinski, and C. M. Schneider, “Spin-polarized quantized electronic structure of Fe(001) with symmetry breaking due to the magnetization direction”, Phys. Rev. B 103, 035134 (2021), https://doi.org/10.1103/PhysRevB.103.035134
P. Gospodarič, E. Młyńczak, I. Soldatov, A. Kákay, D. E. Bürgler, L. Plucinski, R. Schäfer, J. Fassbender, and C. M. Schneider, “Multistate current-induced magnetization switching in Au/Fe/MgO(001) epitaxial heterostructures”, Phys. Rev. Research 3, 023089 (2021), https://doi.org/10.1103/PhysRevResearch.3.023089
E. Młyńczak, M. C. T. D. Müller, P. Gospodarič, T. Heider, I. Aguilera, G. Bihlmayer, M. Gehlmann, M. Jugovac, G. Zamborlini, C. Tusche, S. Suga, V. Feyer, L. Plucinski, C. Friedrich, S Blügel, and C. M. Schneider, “Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe”, Nature Comm. 10, 505 (2019), https://doi.org/10.1038/s41467-019-08445-1
P. Gospodaric, E. Mlynczak, M. Eschbach, M. Gehlmann, G. Zamborlini, V. Feyer, L. Plucinski, and C. M. Schneider, "Localized segregation of Au in ultra-thin Fe films on Au(001)", Phys. Rev. B 97, 085409 (2018), doi: https://doi.org/10.1103/PhysRevB.97.085409
E. Młyńczak, M. Eschbach, S. Borek, J. Minár, J. Braun, I. Aguilera, G. Bihlmayer, S. Döring, M. Gehlmann, P. Gospodarič, S. Suga, L. Plucinski, S. Blügel, H. Ebert, and C. M. Schneider, "Fermi surface manipulation by external magnetic field demonstrated for a prototypical ferromagnet" Phys. Rev. X 6, 041048 (2016), https://doi.org/10.1103/PhysRevX.6.041048
L. Plucinski, Yuan Zhao, C.M. Schneider, B. Sinkovic, and E.Vescovo, “Surface electronic structure of ferromagnetic Fe(001)”, Phys. Rev. B 80, 184430 (2009), https://doi.org/10.1103/PhysRevB.80.184430