Michael Farle
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View article: Identifying grain boundary and intragranular pinning centres in Sm2(Co,Fe,Cu,Zr)17 permanent magnets to guide performance optimisation
Identifying grain boundary and intragranular pinning centres in Sm2(Co,Fe,Cu,Zr)17 permanent magnets to guide performance optimisation Open
Permanent magnets draw their properties from a complex interplay of chemical composition and phase, each with their associated intrinsic magnetic properties. Gaining an understanding of these interactions is the key to deciphering the orig…
View article: Tunable Magnetic Remanence of Antiferromagnetically Coupled Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Nanoparticles for In Vivo Biomedical Applications
Tunable Magnetic Remanence of Antiferromagnetically Coupled Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Nanoparticles for In Vivo Biomedical Applications Open
Magnetic nanoparticles with zero magnetic remanence, which can be noninvasively switched to a high magnetization state, represent a promising route for biomedical applications. Here, we report on nanoparticles consisting of ferrimagnetic F…
View article: High-frequency susceptibility tensor in the inertial regime: Prediction for subterahertz magnonics in ferromagnets
High-frequency susceptibility tensor in the inertial regime: Prediction for subterahertz magnonics in ferromagnets Open
Inertial spin dynamics alters the resonant spin wave excitation resulting in the modification of the resonance field and relaxation in microwave spectroscopy of ferromagnets described by the conventional Landau-Lifshitz-Gilbert (LLG) equat…
View article: Spinel-Structured High Entropy Oxides: Low Temperature Synthesis, Characterization, and Potential Applications
Spinel-Structured High Entropy Oxides: Low Temperature Synthesis, Characterization, and Potential Applications Open
High entropy oxides (HEOs) have recently attracted increasing attention due to their remarkable properties and relatively low cost. Herein we report a simple, highly scalable, and low temperature method for synthesizing spinel (FeNiCoCuZn)…
View article: Nanocrystalline CoMnFeNiGa high entropy alloys: room temperature ferromagnetism bridging the gap from bulk to nano
Nanocrystalline CoMnFeNiGa high entropy alloys: room temperature ferromagnetism bridging the gap from bulk to nano Open
This study provides a new pathway to engineer nanocrystalline soft ferromagnetic CoMnFeNiGa HEAs with tailored properties across different length scales by controlling phase composition and nanoscale structure through synthesis and heat tr…
View article: Amorphization of laser-fabricated ignoble high-entropy alloy nanoparticles and its impact on surface composition and electrochemistry
Amorphization of laser-fabricated ignoble high-entropy alloy nanoparticles and its impact on surface composition and electrochemistry Open
STEM-EDX, HRTEM, SAED, XRD show CrFeCoNi Cu phase structure tunable by pulse duration: ns-LAL yields amorphous, ps-LAL crystalline HEA NPs. XPS, CV reveal surface composition changes; material effects govern scalable LFL amorphization.
View article: Synthesis and magnetic transitions of rare-earth-free Fe–Mn–Ni–Si-based compositionally complex alloys at bulk and nanoscale
Synthesis and magnetic transitions of rare-earth-free Fe–Mn–Ni–Si-based compositionally complex alloys at bulk and nanoscale Open
Magnetic phase transitions at the Curie temperature are essential for applications like magnetocaloric refrigeration, magnetic sensors, and actuators, but the reliance on costly, scarce rare-earth materials limits sustainability. Developin…
View article: Bottom‐Up Synthesis of Metallic CoNi Nanoplatelets with Magnetic Vortex‐Like Spin Configurations
Bottom‐Up Synthesis of Metallic CoNi Nanoplatelets with Magnetic Vortex‐Like Spin Configurations Open
Magnetic nanoplatelets hold significant potential for various technical applications due to their ability to switch between a fully magnetized state with high magnetization and a vortex‐like configuration that eliminates stray fields in th…
View article: Strategic Assembly of La0.8Sr0.2CoO3 Nanoparticles into Supraparticles for Enhanced Oxygen Evolution in Alkaline Electrolysis
Strategic Assembly of La0.8Sr0.2CoO3 Nanoparticles into Supraparticles for Enhanced Oxygen Evolution in Alkaline Electrolysis Open
Developing effective non-noble metal electrocatalysts for the oxygen evolution reaction (OER) remains challenging due to limited active sites and poor electronic conductivity in mixed oxide catalysts. To address these limitations, a one-st…
View article: Genetically Controlled Iron Oxide Biomineralization in Encapsulin Nanocompartments for Magnetic Manipulation of a Mammalian Cell Line
Genetically Controlled Iron Oxide Biomineralization in Encapsulin Nanocompartments for Magnetic Manipulation of a Mammalian Cell Line Open
Magnetic nanoparticles have proven invaluable for biomechanical investigations due to their ability to exert localized forces. However, cellular delivery of exogenous magnetic agents often results in endosomal entrapment, thereby limiting …
View article: Hard magnetic SmCo5-Sn nanocomposites produced by high-pressure torsion
Hard magnetic SmCo5-Sn nanocomposites produced by high-pressure torsion Open
High-pressure torsion of powder blends is used as an unconventional process route for the production of textured magnetic SmCo5-20 wt% Sn nanocomposites. The use of powders as precursors which get consolidated by the process, enables to ov…
View article: Effect of high energy ball milling, heat treatment and spark plasma sintering on structure, composition, thermal stability and magnetism in CoCrFeNiGax (x = 0.5; 1) high entropy alloys
Effect of high energy ball milling, heat treatment and spark plasma sintering on structure, composition, thermal stability and magnetism in CoCrFeNiGax (x = 0.5; 1) high entropy alloys Open
Nanocrystalline (similar to 10 nm) singe-fcc CoCrFeNiGax (x = 0.5, 1.0) high entropy alloy (HEA) particles with excellent structural and compositional homogeneity were prepared from elemental powders using single-step, short-term (190 min)…
View article: An Ultrasensitive Molecular Detector for Direct Sensing of Spin Currents at Room Temperature
An Ultrasensitive Molecular Detector for Direct Sensing of Spin Currents at Room Temperature Open
The experimental analysis of pure spin currents at interfaces is one major goal in the field of magnonics and spintronics. Complementary to the established Spin-Hall effect using the spin-to-charge conversion in heavy metals for informatio…
View article: Epitaxial Fe/Rh bilayers for efficient spin-to-charge conversion
Epitaxial Fe/Rh bilayers for efficient spin-to-charge conversion Open
To address the spin pumping in the conventional ferromagnetic/“normal” metal systems, we fabricated 6 nm Fe/1–15 nm Rh epitaxial bilayers and determined the g-factor, magnetic anisotropy, and magnetization damping by combining both 0–40 GH…
View article: Synthesis of High Entropy Alloy Nanoparticles by Pulsed Laser Ablation in Liquids: Influence of Target Preparation on Stoichiometry and Productivity
Synthesis of High Entropy Alloy Nanoparticles by Pulsed Laser Ablation in Liquids: Influence of Target Preparation on Stoichiometry and Productivity Open
High entropy alloys (HEAs) have a wide range of applications across various fields, including structural engineering, biomedical science, catalysis, magnetism, and nuclear technology. Nanoscale HEA particles show promising catalytic proper…
View article: Reciprocity relations in a biologically inspired nanomagnonic system with dipolar coupling
Reciprocity relations in a biologically inspired nanomagnonic system with dipolar coupling Open
Magnetosome chains in magnetotactic bacteria present ideal nanomagnonic model systems for studying collective resonance modes of dipolar-coupled single domain particles in relation to their spatial arrangement. Using microresonator-based f…
View article: Semisynthetic ferritin-based nanoparticles with high magnetic anisotropy for spatial magnetic manipulation and inductive heating
Semisynthetic ferritin-based nanoparticles with high magnetic anisotropy for spatial magnetic manipulation and inductive heating Open
The core of the semi-synthetic magnetic nanoparticle magnetoferritin was doped with cobalt or zinc in order to evaluate its applicability as a nanoagent for intracellular target redistribution or localised heat dissipation via magnetic hyp…
View article: Location and morphology of ferromagnetic precipitates in Ni-Mn-Sn
Location and morphology of ferromagnetic precipitates in Ni-Mn-Sn Open
${\mathrm{Ni}}_{50}{\mathrm{Mn}}_{45}{\mathrm{Sn}}_{05}$ heated above 600 K decomposes into ferromagnetic ${\mathrm{Ni}}_{2}\mathrm{MnSn}$ precipitates in an antiferromagnetic NiMn matrix. If an external magnetic field is applied during an…
View article: Influence of Colloidal Additivation with Surfactant‐Free Laser‐Generated Metal Nanoparticles on the Microstructure of Suction‐Cast Nd–Fe–B Alloy
Influence of Colloidal Additivation with Surfactant‐Free Laser‐Generated Metal Nanoparticles on the Microstructure of Suction‐Cast Nd–Fe–B Alloy Open
Development of new powder feedstocks using nanoparticles (NPs) has the potential to influence the microstructure of as‐built parts and overcome the limitations of current powder‐based additive manufacturing (AM) techniques. The focus of th…
View article: 4D printing of magneto-responsive polymer structures by masked stereolithography for miniaturised actuators
4D printing of magneto-responsive polymer structures by masked stereolithography for miniaturised actuators Open
Masked stereolithography printing can be used to produce functionalised magneto-responsive polymer structures. Magnetic filler additivation of the photopolymer enables the production of powerful and fast soft robotics. However, current app…
View article: Annealing time, temperature, and field dependence of pinned magnetic moments in the collinear antiferromagnet PdMn
Annealing time, temperature, and field dependence of pinned magnetic moments in the collinear antiferromagnet PdMn Open
Annealing the collinear antiferromagnet PdMn with excess Pd in a magnetic field produces strongly pinned magnetic moments in the annealing field direction. This behavior can be understood with the help of the magnetic-field-biased diffusio…
View article: Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films
Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films Open
In this study, we present a novel investigation into the magnetic and morphological properties of equiatomic B2-ordered FeRh thin films irradiated with single high-intensity ultrashort laser pulses. The goal is to elucidate the effect of f…
View article: Comparative insights into microstructure and magnetism of Ni-Mn-Sn Heusler alloys manufactured by electron beam and laser beam powder bed fusion
Comparative insights into microstructure and magnetism of Ni-Mn-Sn Heusler alloys manufactured by electron beam and laser beam powder bed fusion Open
Powder bed fusion (PBF) is a promising but challenging method for additive manufacturing of magnetocaloric Ni-Mn-Sn Heusler alloys, due to the material's inherent brittleness. To produce crack-free near-net-shape parts from prealloyed gas …
View article: Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films
Femtosecond Laser Ablation-Induced Magnetic Phase Transformations in FeRh Thin Films Open
Magnetic and morphological properties of equiatomic B2-ordered FeRh thin films irradiated with single high-intensity ultrashort laser pulses are investigated. The goal is to elucidate the effect of femtosecond laser ablation on the magneti…
View article: Towards engineering the perfect defect in high-performing permanent magnets
Towards engineering the perfect defect in high-performing permanent magnets Open
Permanent magnets draw their properties from a complex interplay, across multiple length scales, of the composition and distribution of their constituting phases, that act as building blocks, each with their associated intrinsic properties…
View article: Influence of colloidal surface-additivation with surfactant-free laser-generated metal nanoparticles on Nd-Fe-B permanent magnets produced by suction casting
Influence of colloidal surface-additivation with surfactant-free laser-generated metal nanoparticles on Nd-Fe-B permanent magnets produced by suction casting Open
The development of new powder feedstocks using nanoparticles (NPs) has the potential to enhance the functionality of as-built parts and overcome the limitations of current additive manufacturing (AM) techniques. This study investigated the…
View article: Influence of amorphous phase on coercivity in SmCo5-Cu nanocomposites
Influence of amorphous phase on coercivity in SmCo5-Cu nanocomposites Open
Severe plastic deformation of powder blends consisting of SmCo5-Cu results in magnetically hardened nanocomposite bulk materials. The microstructure is continuously refined with increasing torsional deformation, yet, coercivity saturates a…