Matthias Opel
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View article: Structural Evolution of Printed Ternary Magnetic Hybrid Thin Films Containing Soft and Hard Magnetic Nanoparticles for Coupled Composites
Structural Evolution of Printed Ternary Magnetic Hybrid Thin Films Containing Soft and Hard Magnetic Nanoparticles for Coupled Composites Open
Diblock copolymer thin films templating two types of magnetic nanoparticles are ternary nanocomposites that can show tunable magnetic behavior depending on the size and magnetic properties of the nanoparticles. In the case of utilizing bot…
View article: Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface
Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface Open
The resistance of a heavy metal can be modulated by an adjacent magnetic material through the combined effects of the spin Hall effect, inverse spin Hall effect, and dissipation of the spin accumulation at the interface. This phenomenon is…
View article: Printed Thin Magnetic Films via Ternary Hybrid Diblock Copolymer Films Containing Magnetic Iron Oxide and Nickel Nanoparticles
Printed Thin Magnetic Films via Ternary Hybrid Diblock Copolymer Films Containing Magnetic Iron Oxide and Nickel Nanoparticles Open
Ternary hybrid thin films composed of a diblock copolymer templating two types of nanoparticles (NPs) expand the functionality of binary systems, which renders them interesting for magnetic sensing or magnetic data storage applications. He…
View article: Chiral phonons and phononic birefringence in ferromagnetic metal–bulk acoustic resonator hybrids
Chiral phonons and phononic birefringence in ferromagnetic metal–bulk acoustic resonator hybrids Open
The magnetoelastic coupling of magnetic and elastic excitations enables the generation of elastic waves carrying angular momentum. In a quantum picture, this corresponds to a resonant conversion of magnons to chiral phonons and vice versa.…
View article: Impact of growth conditions on magnetic anisotropy and magnon Hanle effect in <i>α</i>-Fe2O3
Impact of growth conditions on magnetic anisotropy and magnon Hanle effect in <i>α</i>-Fe2O3 Open
The antiferromagnetic insulator α-Fe2O3 (hematite), widely used in spintronics and magnonics, features a spin-reorientation transition (Morin transition) at 263 K. Thin films, however, often lack this Morin transition, limiting their poten…
View article: Impact of magnetic anisotropy on the magnon Hanle effect in $α$-Fe$_2$O$_3$
Impact of magnetic anisotropy on the magnon Hanle effect in $α$-Fe$_2$O$_3$ Open
In easy-plane antiferromagnets, the nature of the elementary excitations of the spin system is captured by the precession of the magnon pseudospin around its equilibrium pseudofield, manifesting itself in the magnon Hanle effect. Here, we …
View article: Carboxymethyl-Dextran-Coated Superparamagnetic Iron Oxide Nanoparticles for Drug Delivery: Influence of the Coating Thickness on the Particle Properties
Carboxymethyl-Dextran-Coated Superparamagnetic Iron Oxide Nanoparticles for Drug Delivery: Influence of the Coating Thickness on the Particle Properties Open
Carboxymethyl-dextran (CMD)-coated iron oxide nanoparticles (IONs) are of great interest in nanomedicine, especially for applications in drug delivery. To develop a magnetically controlled drug delivery system, many factors must be conside…
View article: Observation of nonreciprocal magnon Hanle effect
Observation of nonreciprocal magnon Hanle effect Open
The precession of magnon pseudospin about the equilibrium pseudofield, the latter capturing the nature of magnonic eigen-excitations in an antiferromagnet, gives rise to the magnon Hanle effect. Its realization via electrically injected an…
View article: Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets
Influence of low-energy magnons on magnon Hanle experiments in easy-plane antiferromagnets Open
Antiferromagnetic materials host pairs of spin-up and spin-down magnons which can be described in terms of a magnonic pseudospin. The close analogy between this magnonic pseudospin systems and that of electronic charge carriers led to the …
View article: Low-temperature suppression of the spin Nernst angle in Pt
Low-temperature suppression of the spin Nernst angle in Pt Open
We demonstrate the low temperature suppression of the platinum (Pt) spin Nernst angle in bilayers consisting of the antiferromagnetic insulator hematite ($α$-Fe$_2$O$_3$) and Pt upon measuring the transverse spin Nernst magnetothermopower …
View article: In Situ Study of FePt Nanoparticles‐Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films
In Situ Study of FePt Nanoparticles‐Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films Open
The development of magnetic hybrid films containing diblock copolymers (DBCs) and magnetic nanoparticles (NPs) by printing is a highly promising method for scalable and low‐cost fabrication. During printing, the drying and arrangement kine…
View article: Static magnetic proximity effects and spin Hall magnetoresistance in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Pt</mml:mi><mml:mo>/</mml:mo><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math> and inverted <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>12</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi>Pt</mml:mi></mml:mrow></mml:math> bilayers
Static magnetic proximity effects and spin Hall magnetoresistance in and inverted bilayers Open
The magnetic state of heavy metal Pt thin films in proximity to the\nferrimagnetic insulator Y$_{3}$Fe$_{5}$O$_{12}$ has been investigated\nsystematically by means of x-ray magnetic circular dichroism and x-ray resonant\nmagnetic reflectiv…
View article: Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle Effect
Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle Effect Open
We report on experiments demonstrating coherent control of magnon spin transport and pseudospin dynamics in a thin film of the antiferromagnetic insulator hematite utilizing two Pt strips for all-electrical magnon injection and detection. …
View article: Precise control of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>J</mml:mi><mml:mi>eff</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math> magnetic properties in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> epitaxial thin films by variation of strain and thin film thickness
Precise control of magnetic properties in epitaxial thin films by variation of strain and thin film thickness Open
We report on a comprehensive investigation of the effects of strain and film\nthickness on the structural and magnetic properties of epitaxial thin films of\nthe prototypal $J_\\mathrm{eff}=1/2$ compound Sr$_2$IrO$_4$ by advanced X-ray\nsc…
View article: Direct evidence for anisotropic three-dimensional magnetic excitations in a hole-doped antiferromagnet
Direct evidence for anisotropic three-dimensional magnetic excitations in a hole-doped antiferromagnet Open
Funder: \n RWTH Aachen University\n http://dx.doi.org/10.13039/501100007210
View article: Coherent Control of Magnonic Spin Transport in an Antiferromagnetic Insulator
Coherent Control of Magnonic Spin Transport in an Antiferromagnetic Insulator Open
The spin-1/2 of an electron makes it an archetypal two-level system and inspires the description of other two-level systems using an analogous pseudospin. The quantized spin excitations of an ordered antiferromagnet are such pairs of spin-…
View article: Effect of interfacial oxidation layer in spin pumping experiments on Ni$_{80}$Fe$_{20}$/SrIrO$_3$ heterostructures
Effect of interfacial oxidation layer in spin pumping experiments on Ni$_{80}$Fe$_{20}$/SrIrO$_3$ heterostructures Open
SrIrO$_3$ with its large spin-orbit coupling and low charge conductivity has emerged as a potential candidate for efficient spin-orbit torque magnetization control in spintronic devices. We here report on the influence of an interfacial ox…
View article: Surface distortion of Fe dot-decorated TiO2 nanotubular templates using time-of-flight grazing incidence small angle scattering
Surface distortion of Fe dot-decorated TiO2 nanotubular templates using time-of-flight grazing incidence small angle scattering Open
Physical properties of nanoclusters, nanostructures and self-assembled nanodots, which in turn are concomitantly dependent upon the morphological properties, can be modulated for functional purposes. Here, in this article, magnetic nanodot…
View article: PO-1004 Simulation of tissue dependent magnetic field susceptibility effects in MRI guided radiotherapy
PO-1004 Simulation of tissue dependent magnetic field susceptibility effects in MRI guided radiotherapy Open
View article: Structural and magnetic properties of cobalt iron disulfide (CoxFe1−xS2) nanocrystals
Structural and magnetic properties of cobalt iron disulfide (CoxFe1−xS2) nanocrystals Open
View article: Phonon anomalies in FeS
Phonon anomalies in FeS Open
Here, we present results from light scattering experiments on tetragonal FeS with the focus placed on lattice dynamics. We identify the Raman active A1g and B1g phonon modes, a second order scattering process involvin…
View article: Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures
Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures Open
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View article: Magnetic excitations and amplitude fluctuations in insulating cuprates
Magnetic excitations and amplitude fluctuations in insulating cuprates Open
We present results from light scattering experiments on three insulating antiferromagnetic cuprates, YBa$_2$Cu$_3$O$_{6.05}$, Bi$_2$Sr$_2$YCu$_2$O$_{8+\delta}$, and La$_2$CuO$_4$ as a function of polarization and excitation energy {using s…
View article: Spin Hall magnetoresistance in a canted ferrimagnet
Spin Hall magnetoresistance in a canted ferrimagnet Open
We study the spin Hall magnetoresistance effect in ferrimagnet/normal metal bilayers, comparing the response in collinear and canted magnetic phases. In the collinear magnetic phase, in which the sublattice magnetic moments are all aligned…
View article: Untangling the contributions of cerium and iron to the magnetism of Ce-doped yttrium iron garnet
Untangling the contributions of cerium and iron to the magnetism of Ce-doped yttrium iron garnet Open
The remarkable magnetic properties of yttrium iron garnets (YIGs) underpin the use of these materials in a broad scope of spintronic and photonic applications. In particular, the addition of rare earth metals in the structure enhances to a…
View article: Arrangement of Maghemite Nanoparticles via Wet Chemical Self-Assembly in PS-<i>b</i>-PNIPAM Diblock Copolymer Films
Arrangement of Maghemite Nanoparticles via Wet Chemical Self-Assembly in PS-<i>b</i>-PNIPAM Diblock Copolymer Films Open
The structure and magnetic behavior of hybrid films composed of maghemite (γ-Fe2O3) nanoparticles (NPs) and an asymmetric diblock copolymer (DBC) polystyrene61-block-polyN-isopropylacrylamide115 are investigated. The NPs are coated with PS…
View article: Anomalous Hall effect in YIG|Pt bilayers
Anomalous Hall effect in YIG|Pt bilayers Open
We measure the ordinary and the anomalous Hall effect in a set of yttrium iron garnet|platinum (YIG|Pt) bilayers via magnetization orientation dependent magnetoresistance experiments. Our data show that the presence of the ferrimagnetic in…