A5101531622- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Photonic Crystals and Applications
- Advanced Condensed Matter Physics
- Magneto-Optical Properties and Applications
University of Kaiserslautern
2019-2023
University of Applied Sciences Mainz
2021-2023
Daimler (Germany)
2022
Spin waves in yttrium iron garnet (YIG) nano-structures attract increasing attention from the perspective of novel magnon-based data processing applications. For short wavelengths needed small-scale devices, group velocity is directly proportional to spin-wave exchange stiffness constant $\lambda_\mathrm{ex}$. Using wave vector resolved Brillouin Light Scattering (BLS) spectroscopy, we measure $\lambda_\mathrm{ex}$ Ga-substituted YIG thin films and show that it about three times larger than...
We present results of the analysis Brillouin light-scattering (BLS) measurements spin waves performed on ultrathin single and multirepeat CoFeB layers with adjacent heavy metal layers. From a detailed study spin-wave dispersion relation, we independently extract Heisenberg exchange interaction (also referred to as symmetric interaction), Dzyaloshinskii–Moriya (DMI, also antisymmetric anisotropy field. find large DMI in thin films Pt layer nearly vanishing for W layer. Furthermore, influence...
The symmetric (Heisenberg) exchange interaction is fundamental to magnetism and assumes critical importance in designing magnetic materials for novel emergent phenomena device applications. However, quantifying extremely challenging ultrathin films, as techniques approximations reliably used bulk are largely inapplicable the two-dimensional limit. Here we present contrast measurement of stiffness $A$ by several methods on a series five Co/Pt-based ($1--2$ nm) films. We compare results from...
We experimentally demonstrate the formation of room-temperature skyrmions with radii about 25\,nm in easy-plane anisotropy multilayers interfacial Dzyaloshinskii-Moriya interaction (DMI). detect individual magnetic by force microscopy and find that are stable out-of-plane fields up to 200 mT. determine interlayer exchange coupling as well strength DMI. Additionally, we investigate dynamic microwave spin excitations broadband resonance spectroscopy. From uniform Kittel mode low damping...
The interfacial Dzyaloshinskii-Moriya Interaction (iDMI) is an antisymmetric exchange interaction that induced by the broken inversion symmetry at interface of, e.g., a ferromagnet/heavy metal. Thus, presence of iDMI not expected in symmetrical multilayer stacks such structures. Here, we use thermal annealing to induce [Py/Pt]
Abstract The interfacial Dzyaloshinskii-Moriya Interaction (iDMI) is an antisymmetric exchange interaction that induced by the broken inversion symmetry at interface of, e.g., a ferromagnet/heavy metal. Thus, presence of iDMI not expected in symmetrical multilayer stacks such structures. Here, we use thermal annealing to induce [Py/Pt] ×10 stack. Brillouin light scattering spectroscopy used directly evidence induction annealed sample. Structural characterizations highlight modified...