Axel Hoffmann
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View article: Magnetostriction and Temperature Dependent Gilbert Damping in Boron Doped Fe$_{80}$Ga$_{20}$ Thin Films
Magnetostriction and Temperature Dependent Gilbert Damping in Boron Doped Fe$_{80}$Ga$_{20}$ Thin Films Open
Magnetic thin films with strong magnetoelastic coupling and low Gilbert damping are key materials for many magnetoelectric devices. Here, we investigated the effects of boron doping concentration on magnetostriction and temperature depende…
Spin-Torque-Driven Non-uniform Dynamics of an Antivortex Core in Truncated Astroid Shaped Nanomagnets Open
Spin textures that are not readily available in the domain structures of continuous magnetic thin films can be stabilized when patterned to micro/nano scales due to the dominant effect of dipolar magnetic interactions. Fabrication of such …
Single-shot electrical detection of short-wavelength magnon pulse transmission in a magnonic thin-film waveguide Open
The advance of magnon spintronics requires understanding of time-domain magnon pulse transmission in order to develop high-speed information processing protocols. In this work, we demonstrate single-shot electrical detection of narrow-band…
View article: High dynamic-range quantum sensing of magnons and their dynamics using a superconducting qubit
High dynamic-range quantum sensing of magnons and their dynamics using a superconducting qubit Open
Magnons can endow quantum devices with new functionalities. Assessing their potential requires precise characterization of magnon properties. Here, we use a superconducting qubit to probe magnons in a ferrimagnet over a range of about 2000…
Spin-Polarized Antiferromagnetic Metals Open
Spin-polarized antiferromagnets have recently gained significant interest because they combine the advantages of both ferromagnets (spin polarization) and antiferromagnets (absence of net magnetization) for spintronics applications. In par…
View article: Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface
Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface Open
We investigate the structural and electronic origin of antiferromagnetic (AFM) coupling in the yttrium iron garnet (YIG) and permalloy (Ni80Fe20, Py) bilayer system at the atomic level. Ferromagnetic resonance (FMR) spectra reveal unique …
Numerical simulation projects in micromagnetics with Jupyter Open
We report a case study where an existing materials science course was modified to include numerical simulation projects on the micromagnetic behavior of materials. The Ubermag micromagnetic simulation software package is used in order to s…
Spin-polarized antiferromagnetic metals Open
Spin-polarized antiferromagnets have recently gained significant interest because they combine the advantages of both ferromagnets (spin polarization) and antiferromagnets (absence of net magnetization) for spintronics applications. In par…
Thermal contribution to current-driven antiferromagnetic-order switching Open
In information technology devices, current-driven state switching is crucial in various disciplines including spintronics, where the contribution of heating to the switching mechanism plays an inevitable role. Recently, current-driven anti…
View article: Unconventional Spin-Orbit Torques from Sputtered MoTe2 Films
Unconventional Spin-Orbit Torques from Sputtered MoTe2 Films Open
Materials with strong spin-orbit coupling and low crystalline symmetry are promising for generating large unconventional spin-orbit torques (SOTs), such as in-plane field-like (FL) torques and out-of-plane damping-like (DL) torques, which …
Unconventional Field-Like Spin-Torques in CrPt$_3$ Open
The topological semimetal CrPt$_3$ has potential for generating unconventional spin torques due to its ferrimagnetic ordering, topological band structure, and high anomalous Hall effect. CrPt$_3$ exhibits ferrimagnetic behavior only in its…
Enhanced spin pumping in heterostructures of coupled ferrimagnetic garnets Open
Spin pumping has significant implications for spintronics, providing a mechanism to manipulate and transport spins for information processing. Understanding and harnessing spin currents through spin pumping is critical for the development …
Influence of temperature, doping, and amorphization on the electronic structure and magnetic damping of iron Open
Hybrid magnonic quantum systems have drawn increased attention in recent years for coherent quantum information processing, but too large magnetic damping is a persistent concern when metallic magnets are used. Their intrinsic damping is l…
Thermal contribution to current-driven antiferromagnetic-order switching Open
In information technology devices, current-driven state switching is crucial in various disciplines including spintronics, where the contribution of heating to the switching mechanism plays an inevitable role. Recently, current-driven anti…
View article: Colossal anisotropic absorption of spin currents induced by chirality
Colossal anisotropic absorption of spin currents induced by chirality Open
The chiral induced spin selectivity (CISS) effect, in which the structural chirality of a material determines the preference for the transmission of electrons with one spin orientation over that of the other, is emerging as a design princi…
Ultrafast THz emission spectroscopy of spin currents in the metamagnet FeRh Open
Heterostructures of ferromagnetic (FM) and noble metal (NM) thin films have recently attracted considerable interest as viable platforms for the ultrafast generation, control, and transduction of light-induced spin currents. In such system…
Emerging materials in antiferromagnetic spintronics Open
International audience
Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface Open
We investigate the structural and electronic origin of antiferromagnetic (AFM) coupling in the Yttrium iron garnet (YIG) and permalloy (Py) bilayer system at the atomic level. Ferromagnetic Resonance (FMR) reveal unique hybrid modes in sam…
Magnon mediated spin pumping by coupled ferrimagnetic garnets heterostructure Open
Spin pumping has significant implications for spintronics, providing a mechanism to manipulate and transport spins for information processing. Understanding and harnessing spin currents through spin pumping is critical for the development …
Epitaxial growth and magnetic properties of kagome metal FeSn/elemental ferromagnet heterostructures Open
Binary kagome compounds TmXn (T = Mn, Fe, Co; X = Sn, Ge; m:n = 3:1, 3:2, 1:1) have garnered recent interest owing to the presence of both topological band crossings and flat bands arising from the geometry of the metal-site kagome lattice…
Influence of temperature, doping, and amorphization on the electronic structure and magnetic damping of iron Open
Hybrid magnonic quantum systems have drawn increased attention in recent years for coherent quantum information processing, but too large magnetic damping is a persistent concern when metallic magnets are used. Their intrinsic damping is l…
View article: Probing intrinsic magnon bandgap in a layered hybrid perovskite antiferromagnet by a superconducting resonator
Probing intrinsic magnon bandgap in a layered hybrid perovskite antiferromagnet by a superconducting resonator Open
Coherent interactions between different magnetic excitations can lead to formation of magnon band gaps and hybrid magnon modes, which can find their applications in magnonic devices and coherent information processing. In this work, we pro…
View article: Integrating magnons for quantum information
Integrating magnons for quantum information Open
Magnons, the quanta of collective spin excitations in magnetically ordered materials, have distinct properties that make them uniquely appealing for quantum information applications. They can have ultra-small wavelengths down to the nanome…
Programmable Real-Time Magnon Interference in Two Remotely Coupled Magnonic Resonators Open
Magnon interference is a signature of coherent magnon interactions for coherent information processing. In this work, we demonstrate programmable real-time magnon interference, with examples of nearly perfect constructive and destructive i…
Evidence of pseudogravitational distortions of the Fermi surface geometry in the antiferromagnetic metal FeRh Open
The confluence between high-energy physics and condensed matter has produced groundbreaking results via unexpected connections between the two traditionally disparate areas. In this work, we elucidate additional connectivity between high-e…
Evidence of Pseudogravitational Distortions of the Fermi Surface Geometry in the Antiferromagnetic Metal FeRh Open
The confluence between high-energy physics and condensed matter has produced groundbreaking results via unexpected connections between the two traditionally disparate areas. In this work, we elucidate additional connectivity between high-e…