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Dirk Grundler

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Related publications (87)

Page 4 of 5

Reversal Mechanism of an Individual Ni Nanotube Simultaneously Studied by Torque and SQUID Magnetometry

Anna Fontcuberta i Morral, Dirk Grundler, Eleonora Russo

Using an optimally coupled nanometer-scale SQUID, we measure the magnetic flux originating from an individual ferromagnetic Ni nanotube attached to a Si cantilever. At the same time, we detect the nanotube's volume magnetization using torque magnetometry. ...

American Physical Society2013

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

Bistable nanomagnet as programmable phase inverter for spin waves

Dirk Grundler, Korbinian Baumgärtl

To realize spin wave logic gates, programmable phase inverters are essential. We image using phase-resolved Brillouin light scattering microscopy propagating spin waves in a one-dimensional magnonic crystal consisting of dipolarly coupled magnetic nanostri ...

AIP American Institute of Physics2021

Magnetization reversal of an individual exchange-biased permalloy nanotube

Anna Fontcuberta i Morral, Dirk Grundler, Gözde Tütüncüoglu, Federico Matteini

We investigate the magnetization reversal mechanism in an individual permalloy (Py) nanotube (NT) using a hybrid magnetometer consisting of a nanometer-scale SQUID (nanoSQUID) and a cantilever torque sensor. The Py NT is affixed to the tip of a Si cantilev ...

American Physical Society2015

Reversal of nanomagnets by propagating magnons in ferrimagnetic yttrium iron garnet enabling nonvolatile magnon memory

Dirk Grundler, Korbinian Baumgärtl

Despite the unprecedented downscaling of CMOS integrated circuits, memory-intensive machine learning and artificial intelligence applications are limited by data conversion between memory and processor. There is a challenging quest for novel approaches to ...

Nature Research2023

Imaging Stray Magnetic Field of Individual Ferromagnetic Nanotubes

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

American Chemical Society (ACS)2018

Periodic Phase Slips and Frequency Comb Generation at Tunable Microwave Frequencies in Superconducting Diabolo Structures

Dirk Grundler

Superconductors are characterized by macroscopic phase coherence and have enabled cryogenic electronics and quantum technologies. Recent advances in 3D nanofabrication now offer possibilities for tuning functional properties relevant for on-chip 3D integra ...

American Chemical Society (ACS)2025

Observation of end-vortex nucleation in individual ferromagnetic nanotubes

Anna Fontcuberta i Morral, Dirk Grundler, Gözde Tütüncüoglu

2018

Nanoscale multifunctional sensor formed by a Ni nanotube and a scanning Nb nanoSQUID

Anna Fontcuberta i Morral, Dirk Grundler, Eleonora Russo, Daniel Rüffer

Nanoscale magnets might form the building blocks of next generation memories. To explore their functionality, magnetic sensing at the nanoscale is key. We present a multifunctional combination of a nanometer-sized superconducting quantum interference devic ...

American Physical Society2013

Anisotropic magnetoresistance of individual CoFeB and Ni nanotubes with values of up to 1.4% at room temperature

Anna Fontcuberta i Morral, Dirk Grundler, Gözde Tütüncüoglu, Eleonora Russo, Federico Matteini, Reza Zamani

Magnetic nanotubes (NTs) are interesting for magnetic memory and magnonic applications. We report magnetotransport experiments on individual 10 to 20 mu m long Ni and CoFeB NTs with outer diameters ranging from 160 to 390 nm and film thicknesses of 20 to 4 ...

Amer Inst Physics2014

Dynamic cantilever magnetometry of individual CoFeB nanotubes

Anna Fontcuberta i Morral, Dirk Grundler

We investigate single CoFeB nanotubes with hexagonal cross section using dynamic cantilever magnetometry (DCM). We develop both an analytical model based on the Stoner-Wohlfarth approximation and a broadly applicable numerical framework for analyzing DCM m ...

2016

Top-down design of magnonic crystals from bottom-up magnetic nanoparticles through protein arrays

Dirk Grundler

We show that chemical fixation enables top-down micro-machining of large periodic 3D arrays of protein-encapsulated magnetic nanoparticles (NPs) without loss of order. We machined 3D micro-cubes containing a superlattice of NPs by means of focused ion beam ...

Institute of Physics2017

Short-wave magnons with multipole spin precession detected in the topological bands of a skyrmion lattice

Henrik Moodysson Rønnow, Arnaud Magrez, Dirk Grundler, Ping Che, Priya Ranjan Baral, Thomas Schönenberger

Topological magnon bands enable uni-directional edge transport without backscattering, enhancing the robustness of magnonic circuits and providing a novel platform for exploring quantum transport phenomena. Magnetic skyrmion lattices, in particular, host a ...

Springer Science and Business Media LLC2025

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

Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets

Dirk Grundler

Magnetic materials hosting correlated electrons play an important role for information technology and signal processing. The currently used ferro-, ferri- and antiferromagnetic materials provide microscopic moments (spins) that are mainly collinear. Recent ...

Iop Publishing Ltd2017

Orientation-dependent two-dimensional magnonic crystal modes in an ultralow-damping ferrimagnetic waveguide containing repositioned hexagonal lattices of Cu disks

Dirk Grundler

Two-dimensional (2D) hexagonal lattices of Cu disks are shown to induce orientation-dependent magnonic crystal (MC) modes for propagating forward volume spin waves in a single-crystal yttrium iron garnet (YIG) film. The width and depth of the magnonic band ...

American Physical Society (APS)2024

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

Spin waves with large decay length and few 100 nm wavelengths in thin yttrium iron garnet grown at the wafer scale

Dirk Grundler

Using conventional coplanar waveguides (CPWs), we excited spin waves with a wavelength λ down to 310 nm in a 200 nm thin yttrium iron garnet film grown by liquid phase epitaxy. Spin-wave transmission was detected between CPWs that we separated by up to 2 m ...

American Institute of Physics2017

Imaging magnetic vortex configurations in ferromagnetic nanotubes

Anna Fontcuberta i Morral, Dirk Grundler, Gözde Tütüncüoglu

We image the remnant magnetization configurations of CoFeB and permalloy nanotubes (NTs) using x-ray magnetic circular dichroism photoemission electron microscopy. The images provide direct evidence for flux-closure configurations, including a global vorte ...

American Physical Society2017

Spin dynamics, loop formation and cooperative reversal in artificial quasicrystals with tailored exchange coupling

Dirk Grundler, Sho Watanabe, Vinayak Shantaram Bhat

Aperiodicity and un-conventional rotational symmetries allow quasicrystalline structures to exhibit unusual physical and functional properties. In magnetism, artificial ferromagnetic quasicrystals exhibited knee anomalies suggesting reprogrammable magnetic ...

2023