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Dirk Grundler

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Related publications (87)

Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Jean-Philippe Ansermet, Haiming Yu, Peng Gao, Dirk Grundler, Jilei Chen, Mohammad Hamdi, Jianyu Zhang, Yu Zhang

Magnons can transfer information in metals and insulators without Joule heating, and therefore are promising for low-power computation. The on-chip magnonics however suffers from high losses due to limited magnon decay length. In metallic thin films, it is ...

Nature Research2021

Direct Observation of Worm‐Like Nanochannels and Emergent Magnon Motifs in Artificial Ferromagnetic Quasicrystals

Dirk Grundler, Vinayak Shantaram Bhat, Sho Watanabe

Quasicrystalline structures and aperiodic metamaterials find applications ranging from established consumer gadgets to potential high‐tech photonic components owing to both complex arrangements of constituents and exotic rotational symmetries. Magnonics is ...

2020

Magnon Modes of Microstates and Microwave-Induced Avalanche in Kagome Artificial Spin Ice with Topological Defects

Dirk Grundler, Vinayak Shantaram Bhat

We investigate spin dynamics of microstates in artificial spin ice (ASI) in Ni81Fe19 nanomagnets arranged in an interconnected kagome lattice using microfocus Brillouin light scattering, broadband ferromagnetic resonance, magnetic force microscopy, x-ray p ...

2020

Efficient wavelength conversion of exchange magnons below 100 nm by magnetic coplanar waveguides

Dirk Grundler, Ping Che, Anna Kúkol'ová

Exchange magnons are essential for unprecedented miniaturization of GHz electronics and magnon-based logic. However, their efficient excitation via microwave fields is still a challenge. Current methods including nanocontacts and grating couplers require a ...

Nature Research2020

Nanoimaging of Ultrashort Magnon Emission by Ferromagnetic Grating Couplers at GHz Frequencies

Dirk Grundler, Ping Che, Korbinian Baumgärtl, Andrea Mucchietto

On-chip signal processing at microwave frequencies is key for modern mobile communication. When one aims at small footprints, low power consumption, reprogrammable filters, and delay lines, magnons in low-damping ferrimagnets offer great promise. Ferromagn ...

American Chemical Society (ACS)2020

Plasma-enhanced atomic layer deposition of nickel nanotubes with low resistivity and coherent magnetization dynamics for 3D spintronics

Anna Fontcuberta i Morral, Dirk Grundler, Maria Carmen Giordano, Julien Gay, Simon Robert Escobar Steinvall

We report plasma-enhanced atomic layer deposition (ALD) to prepare conformal nickel thin films and nanotubes by using nickelocene as a precursor, water as the oxidant agent and an in-cycle plasma enhanced reduction step with hydrogen. The optimized ALD pul ...

2020

Chiral Spin-Wave Velocities Induced by All-Garnet Interfacial Dzyaloshinskii-Moriya Interaction in Ultrathin Yttrium Iron Garnet Films

Haiming Yu, Song Liu, Peng Gao, Dirk Grundler, Ping Che, Yuehui Li, Sa Tu, Jilei Chen, Jianyu Zhang, Tao Liu

Spin waves can probe the Dzyaloshinskii-Moriya interaction (DMI), which gives rise to topological spin textures, such as skyrmions. However, the DMI has not yet been reported in yttrium iron garnet (YIG) with arguably the lowest damping for spin waves. In ...

2020

Nonreciprocal surface acoustic wave propagation via magneto-rotation coupling

Dirk Grundler, Mingran Xu

A fundamental form of magnon-phonon interaction is an intrinsic property of magnetic materials, the “magnetoelastic coupling.” This form of interaction has been the basis for describing magnetostrictive materials and their applications, where strain induce ...

2020

Single shot acquisition of spatially resolved spin wave dispersion relations using X-ray microscopy

Dirk Grundler

For understanding magnonic materials the fundamental characterization of their frequency response is essential. However, determining full dispersion relations and real space wavelength measurements are challenging and time-consuming tasks. We present an ap ...

Nature Research2020

Optimization of Spin-Wave Propagation with Enhanced Group Velocities by Exchange-Coupled Ferrimagnet-Ferromagnet Bilayers

Dirk Grundler, Vinayak Shantaram Bhat, Kyongmo An

We report broadband spectroscopy and numerical analysis by which we explore propagating spin waves in a magnetic bilayer consisting of a 23-nm thick permalloy film deposited on 130-nm thick Y_3Fe_5O_12. In the bilayer, we observe a characteristic mode that ...

American Physical Society (APS)2019

Weak Crystallization of Fluctuating Skyrmion Textures in MnSi

Dirk Grundler

We report an experimental study of the emergence of nontrivial topological winding and long-range order across the paramagnetic-to-skyrmion lattice transition in the transition metal helimagnet MnSi. Combining measurements of the susceptibility with small- ...

American Physical Society2019

Nonuniform Spin-Wave Softening in Two-Dimensional Magnonic Crystals as a Tool for Opening Omnidirectional Magnonic Band Gaps

Dirk Grundler

By means of the plane-wave method we study spin-wave dynamics in two-dimensional bicomponent magnonic crystals based on a squeezed hexagonal lattice and consist of a permalloy thin film with cobalt inclusions. We explore the dependence of a spin-wave frequ ...

American Physical Society (APS)2019

Phase control of spin waves based on a magnetic defect in a one-dimensional magnonic crystal

Dirk Grundler, Sho Watanabe

Magnonic crystals are interesting for spin-wave based data processing. We investigate one-dimensional magnonic crystals (1D MCs) consisting of bistable Co20Fe60B20 nanostripes separated by 75 nm wide air gaps. By adjusting the magnetic history, we program ...

AIP American Institute of Physics2018

Multi-directional emission and detection of spin waves propagating in yttrium iron garnet with wavelengths down to about 100 nm

Dirk Grundler

We performed broadband spin-wave spectroscopy on 200 nm thick yttrium iron garnet containing arrays of partially embedded magnetic nanodisks. Using integrated coplanar waveguides (CPWs), we studied the excitation and transmission of spin waves depending on ...

AIP American Institute of Physics2018

Angle-dependent magnetization dynamics with mirror-symmetric excitations in artificial quasicrystalline nanomagnet lattices

Dirk Grundler, Vinayak Shantaram Bhat

We report angle-dependent spin-wave spectroscopy on aperiodic quasicrystalline magnetic lattices, i.e., Ammann, Penrose P2 and P3 lattices made of large arrays of interconnected Ni80Fe20 nanobars. Spin-wave spectra obtained in the nearly saturated state co ...

2018

Observation of end-vortex nucleation in individual ferromagnetic nanotubes

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Dirk Grundler

2018

Imaging Stray Magnetic Field of Individual Ferromagnetic Nanotubes

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Jean-Baptiste Leran, Lucas Güniat, Dirk Grundler, Reza Zamani, Jelena Vukajlovic Plestina, Martin George Friedl, Heidi Andrea Potts, Luca Francaviglia, Nicola Rossi, Wonjong Kim, Vladimir Dubrovskii

American Chemical Society (ACS)2018

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Dirk Grundler

We report on the generation and confinement of short-wavelength spin waves in a continuous film with periodically modulated magnetic anisotropy. The concept, which is demonstrated for strain-coupled Co40Fe40B20/BaTiO3 heterostructures, relies on abrupt rot ...

American Physical Society (APS)2017

Experimental determination of Rashba and Dresselhaus parameters and g*- factor anisotropy via Shubnikov-de Haas oscillations

Florian Herzog, Dirk Grundler

The spin splitting of conduction band electrons in inversion-asymmetric InGaAs/InP quantum wells (QWs) is studied by Shubnikov-de Haas measurements combining the analysis of beating patterns and coincidence measurements in doubly tilted magnetic fields. Th ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2017

Room-temperature helimagnetism in FeGe thin films

Dirk Grundler

Chiral magnets are promising materials for the realisation of high-density and low-power spintronic memory devices. For these future applications, a key requirement is the synthesis of appropriate materials in the form of thin films ordering well above roo ...

Nature Research2017

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