A5030953444- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Microbial Fuel Cells and Bioremediation
- ZnO doping and properties
- Bacterial Genetics and Biotechnology
- Microbial Community Ecology and Physiology
Johannes Gutenberg University Mainz
1995-2023
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...
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...
The interfacial Dzyaloshinskii-Moriya interaction (DMI) in multilayers of heavy metal and ferromagnetic metals enables the stabilization novel chiral spin structures such as skyrmions. Magnetic insulators, on other hand can exhibit enhanced dynamics properties lower magnetic damping therefore it is interest to combine enabled by DMI with insulating systems. Here, we demonstrate presence heterostructures that include layers. We use a bilayer perpendicularly magnetized thulium iron garnet...
In antiferromagnets, the efficient propagation of spin-waves has until now only been observed in insulating antiferromagnet hematite, where circularly (or a superposition pairs linearly) polarized propagate over long distances. Here, we report long-distance spin-transport antiferromagnetic orthoferrite YFeO$_3$, different transport mechanism is enabled by combined presence Dzyaloshinskii-Moriya interaction and externally applied fields. The magnon decay length shown to exceed hundreds...
The compensated magnetic order and characteristic terahertz frequencies of antiferromagnetic materials make them promising candidates to develop a new class robust, ultrafast spintronic devices. manipulation spin-waves in thin films is anticipated lead exotic phenomena such as spin-superfluidity, requiring an efficient propagation films. However, the reported decay length has so far been limited few nanometers. In this work, we achieve spin-wave over micrometer distances insulating...
Spin transport is crucial for future spintronic devices operating at bandwidths up to the terahertz (THz) range. In F|N thin-film stacks made of a ferro/ferrimagnetic layer F and normal-metal N, spin mediated by (1) spin-polarized conduction electrons and/or (2) torque between electron spins. To identify cross-over from (2), we study laser-driven currents in F|Pt where consists model materials with different degrees electrical conductivity. For magnetic insulators YIG, GIG maghemite,...
In this letter, we study the origin of anomalous Hall effect (AHE) in ferrimagnetic insulator ${\mathrm{Tm}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (TmIG)/Pt heterostructures. A monotonic decrease resistivity ($\mathrm{\ensuremath{\Delta}}{\ensuremath{\rho}}_{\mathrm{AHE}}$) with decreasing temperature is observed for TmIG/Pt, and a sign reversal $\mathrm{\ensuremath{\Delta}}{\ensuremath{\rho}}_{\mathrm{AHE}}$ occurs at around 80 K. With addition Cu interlayer, similarly decreases as...
Electrical manipulation of magnetism via spin-orbit torques (SOTs) promises efficient spintronic devices. In systems comprising magnetic insulators and heavy metals, SOTs have started to be investigated only recently, especially in with interfacial Dzyaloshinskii-Moriya interaction (iDMI). Here, we quantitatively study the SOT efficiency iDMI a series gadolinium gallium garnet (GGG)/thulium iron (TmIG)/platinum (Pt) heterostructures varying TmIG Pt thicknesses. We find that nonmonotonic as...
Ferrimagnetic ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (YIG) is the prototypical material for studying magnonic properties due to its exceptionally low damping. By substituting yttrium with rare earth elements that have a net magnetic moment, we can introduce an additional spin degree of freedom. Here, study coupling in epitaxial ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$/${\mathrm{Gd}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (YIG/GIG) heterostructures grown by pulsed...
TmFeO$_3$ (TFO) is a canted antiferromagnet that undergoes spin reorientation transition (SRT) with temperature between 82 K and 94 in single crystals. In this region, the N\'eel vector continuously rotates from crystallographic $c$-axis (below K) to $a$-axis (above K). The SRT allows for control of distinct antiferromagnetic states without need magnetic field, making it apt applications working at THz frequencies. For device applications, thin films TFO are required as well an electrical...
Emission 57Fe Mössbauer spectroscopy (eMS), following the implantation of radioactive 57Mn+ ions, has been used to study temperature dependence hyperfine magnetic field at Fe sites in Ba-doped BiFeO3 (BFO) thin films. 57Mn β decays (t1/2 = 90 s) 14.4 keV state 57Fe, thus allowing online eMS measurements a selection sample temperatures during Mn implantation. The were performed on two film BFO samples, 88 nm and 300 thick, doped 15% with Ba ions. samples prepared by pulsed laser deposition...