Moritz Geilen
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View article: Parametric Excitation and Instabilities of Spin Waves Driven by Surface Acoustic Waves
Parametric Excitation and Instabilities of Spin Waves Driven by Surface Acoustic Waves Open
The parametric excitation of spin waves by coherent surface acoustic waves in metallic magnetic thin film structures is demonstrated experimentally using Brillouin light scattering spectroscopy. Complementary micromagnetic simulations and …
View article: Coherent surface acoustic wave–spin wave interactions detected by micro-focused Brillouin light scattering spectroscopy
Coherent surface acoustic wave–spin wave interactions detected by micro-focused Brillouin light scattering spectroscopy Open
We investigated the interaction of surface acoustic waves and spin waves with spatial resolution by micro-focused Brillouin light scattering spectroscopy in a Co40Fe40B20(10 nm) ferromagnetic layer on a LiNbO3-piezoelectric substrate. We e…
View article: Coherent phonon-magnon interactions detected by micro-focused Brillouin light scattering spectroscopy
Coherent phonon-magnon interactions detected by micro-focused Brillouin light scattering spectroscopy Open
We investigated the interaction of surface acoustic waves and spin waves with spatial resolution by micro-focused Brillouin light scattering spectroscopy in a Co$_{40}$Fe$_{40}$B$_{20}$ ferromagnetic layer on a LiNbO$_{3}$-piezoelectric su…
View article: Fully resonant magneto-elastic spin-wave excitation by surface acoustic waves under conservation of energy and linear momentum
Fully resonant magneto-elastic spin-wave excitation by surface acoustic waves under conservation of energy and linear momentum Open
We report on the resonant excitation of spin waves in micro-structured magnetic thin films by short-wavelength surface acoustic waves (SAWs). The spin waves as well as the acoustic waves are studied by micro-focused Brillouin light scatter…
View article: A GHz operating ScAlN based SAW resonator used for Surface Acoustic Waves/Spin Waves Coupling
A GHz operating ScAlN based SAW resonator used for Surface Acoustic Waves/Spin Waves Coupling Open
A thin ScAlN layer was deposited on high resistivity (111) oriented silicon and two port surface acoustic wave (SAW) devices were manufactured, using advanced nanolithographic techniques, on this material. The Surface Acoustic Wave and Spi…
View article: A GHz operating ScAlN based SAW resonator used for Surface Acoustic Waves/Spin Waves Coupling
A GHz operating ScAlN based SAW resonator used for Surface Acoustic Waves/Spin Waves Coupling Open
A thin ScAlN layer was deposited on high resistivity (111) oriented silicon and two port surface acoustic wave (SAW) devices were manufactured, using advanced nanolithographic techniques, on this material. The Surface Acoustic Wave and Spi…
View article: Higgs and Goldstone spin-wave modes in striped magnetic texture
Higgs and Goldstone spin-wave modes in striped magnetic texture Open
Spontaneous symmetry breaking is ubiquitous in physics. Its spectroscopic\nsignature consists in the softening of a specific mode upon approaching the\ntransition from the high symmetry side and its subsequent splitting into a\nzero-freque…
View article: Parametric Excitation and Instabilities of Spin Waves driven by Surface Acoustic Waves
Parametric Excitation and Instabilities of Spin Waves driven by Surface Acoustic Waves Open
The parametric excitation of spin waves by coherent surface acoustic waves is demonstrated experimentally in metallic magnetic thin film structures. The involved magnon modes are analyzed with micro-focused Brillouin light scattering spect…
View article: Interference of co-propagating Rayleigh and Sezawa waves observed with micro-focused Brillouin light scattering spectroscopy
Interference of co-propagating Rayleigh and Sezawa waves observed with micro-focused Brillouin light scattering spectroscopy Open
We use micro-focused Brillouin light scattering spectroscopy (BLS) to investigate surface acoustic waves (SAWs) in a GaN layer on a Si substrate at GHz frequencies. Furthermore, we discuss the concept of BLS for SAWs and show that the cruc…
View article: Optical determination of the exchange stiffness constant in an iron garnet
Optical determination of the exchange stiffness constant in an iron garnet Open
Brillouin light scattering measurements were performed in the backscattering geometry on a Bi-substituted rare earth iron garnet. We observed two different peaks: One is attributed to a surface spin wave in the dipole-exchange regime while…
View article: Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments
Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments Open
We report on the determination of the spin Hall angle and the identification\nof the role of the interface roughness for the inverse spin Hall effect (ISHE)\nin ultra-clean, defect-reduced epitaxial Pt films. By applying vector network\nan…
View article: Phase-to-intensity conversion of magnonic spin currents and application to the design of a majority gate
Phase-to-intensity conversion of magnonic spin currents and application to the design of a majority gate Open
Magnonic spin currents in the form of spin waves and their quanta, magnons, are a promising candidate for a new generation of wave-based logic devices beyond CMOS, where information is encoded in the phase of travelling spin-wave packets. …