Wonbae Bang
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View article: Spin dynamics in permalloy nano-ellipses for honeycomb and square lattices
Spin dynamics in permalloy nano-ellipses for honeycomb and square lattices Open
We report experimental and theoretical studies of spin dynamics in lattice structures of permalloy (Ni80Fe20) nano-ellipses, with four different types of networks including honeycomb and square lattices. The lattices are patterned at the c…
View article: Ferromagnetic resonance in single vertices and 2D lattices macro-dipoles of elongated nanoelements: measurements and simulations
Ferromagnetic resonance in single vertices and 2D lattices macro-dipoles of elongated nanoelements: measurements and simulations Open
We report broadband ferromagnetic resonance measurements of the in-plane magnetic field response of three- and four-fold symmetric vertices formed by non-contacting permalloy nano-ellipses together with extended lattices constructed from t…
View article: Influence of the Vertex Region on Spin Dynamics in Artificial Kagome Spin Ice
Influence of the Vertex Region on Spin Dynamics in Artificial Kagome Spin Ice Open
We present experimental and theoretical studies of spin-wave mode dynamics in artificial kagome spin ice vertices made of three identical 15-nm thick elongated Ni80Fe20 nano-islands (macrospins). We consider several possible configurations…
View article: Control of spin dynamics in artificial honeycomb spin-ice-based nanodisks
Control of spin dynamics in artificial honeycomb spin-ice-based nanodisks Open
In this paper, we report the experimental and theoretical characterization of the angular-dependent spin dynamics in arrays of ferromagnetic nanodisks arranged on a honeycomb lattice. The magnetic field and microwave frequency dependence, …
View article: Magnetostatic spin-waves in an yttrium iron garnet thin film: Comparison between theory and experiment for arbitrary field directions
Magnetostatic spin-waves in an yttrium iron garnet thin film: Comparison between theory and experiment for arbitrary field directions Open
Using a multielement antenna, we have performed measurements of the angular dependence of propagating magnetostatic spin waves in a thin yttrium iron garnet film, both in-plane and out-of-plane, and compared the measurements with existing …
View article: Ferromagnetic resonance spectra of permalloy nano-ellipses as building blocks for complex magnonic lattices
Ferromagnetic resonance spectra of permalloy nano-ellipses as building blocks for complex magnonic lattices Open
We report the experimental and theoretical characterization of the angular dependent magnetic field and microwave frequency response of isolated mesoscopic permalloy nanoellipses for geometries in which the static magnetic field is either …
View article: Direct Detection of Multiple Backward Volume Modes in Yttrium Iron Garnet at Micron Scale Wavelengths
Direct Detection of Multiple Backward Volume Modes in Yttrium Iron Garnet at Micron Scale Wavelengths Open
Spinwave propagation in yttrium iron garnet (YIG) films has a long history [1] but has recently [...]
View article: Phase detection of spin waves in yttrium iron garnet and metal induced nonreciprocity
Phase detection of spin waves in yttrium iron garnet and metal induced nonreciprocity Open
We report experiments which characterize spin wave propagation in a thin (111) yttrium iron garnet film for arbitrary angles between the in-plane magnetic field and the mode wavevectors. By measuring the magnetic field evolution of the pha…
View article: Direct detection of multiple backward volume modes in yttrium iron garnet at micron scale wavelengths
Direct detection of multiple backward volume modes in yttrium iron garnet at micron scale wavelengths Open
Using a set of wave-vector-specific multielement antennas, we have characterized the dispersion of spin waves in an yttrium iron garnet film at submicron lengths and resolved the dispersion relations of multiple backward volume modes, part…
View article: Angular-dependent spin dynamics of a triad of permalloy macrospins
Angular-dependent spin dynamics of a triad of permalloy macrospins Open
We experimentally and theoretically characterize the angular-dependent microwave response of three-macrospin-vertex structures that can serve as a node in various spin ice lattices. The macrospins consist of patterned permalloy thin films …
View article: Thickness dependence of spin wave dynamics in three-fold nano-ellipse clusters
Thickness dependence of spin wave dynamics in three-fold nano-ellipse clusters Open
We present the results of an experimental and theoretical study of spin wave dynamics in three-fold vertices made of permalloy nano-ellipses, with thicknesses ranging from 7.5 nm to 40 nm. For the most symmetric modes, a non-trivial variat…
View article: Study of Surface Character of Micrometer-Scale Dipole-Exchange Spin Waves in an Yttrium Iron Garnet Film
Study of Surface Character of Micrometer-Scale Dipole-Exchange Spin Waves in an Yttrium Iron Garnet Film Open
We demonstrate that micrometer scale spin waves can be excited in a thin film of the ferrimagnetic material Yttrium Iron Garnet (YIG) using patterned, multi-element, antennas. The magnitude of dynamic magnetic field generated by such anten…
View article: Measurements of long-wavelength spin waves for the magnetic field in the Damon-Eshbach, backward-volume and forward-volume geometries of an yttrium iron garnet film
Measurements of long-wavelength spin waves for the magnetic field in the Damon-Eshbach, backward-volume and forward-volume geometries of an yttrium iron garnet film Open
We report systematic measurements of the dispersion of long wavelength spin waves for a wide range of wave vectors for the magnetic field along the three principal directions defining the forward volume, backward volume and Damon-Eshbach m…
View article: Mutual influence between macrospin reversal order and spin-wave dynamics in isolated artificial spin-ice vertices
Mutual influence between macrospin reversal order and spin-wave dynamics in isolated artificial spin-ice vertices Open
We theoretically and experimentally investigate magnetization reversal and associated spin-wave dynamics of isolated threefold vertices that constitute a Kagome lattice. The three permalloy macrospins making up the vertex have an elliptica…
View article: Effects of an adjacent metal surface on spin wave propagation
Effects of an adjacent metal surface on spin wave propagation Open
We experimentally investigate and model the effects of a copper surface adjacent to a surface on which spin waves propagate in a thin film of yttrium iron garnet (YIG). Investigation was performed using a phase detection method, which can …
View article: Coupled macrospins: Mode dynamics in symmetric and asymmetric vertices
Coupled macrospins: Mode dynamics in symmetric and asymmetric vertices Open
We report the microwave response of symmetric and asymmetric threefold clusters with nearly contacting segments that can serve as the node in a Kagome artificial spin ice lattice. The structures are patterned on a coplanar waveguide and co…
View article: Forward volume and surface magnetostatic modes in an yttrium iron garnet film for out-of-plane magnetic fields: Theory and experiment
Forward volume and surface magnetostatic modes in an yttrium iron garnet film for out-of-plane magnetic fields: Theory and experiment Open
We present experimental and theoretical results on the propagation of magnetostatic spin waves in a film of yttrium iron garnet (YIG) for out-of-plane magnetic fields for which propagation in opposite directions is nonreciprocal in the pre…
View article: Excitation of the three principal spin waves in yttrium iron garnet using a wavelength-specific multi-element antenna
Excitation of the three principal spin waves in yttrium iron garnet using a wavelength-specific multi-element antenna Open
We report systematic measurements of the dispersion of long wavelength spin waves for the magnetic field along the three principal directions (supporting the forward volume, backward volume and Damon-Eshbach modes) of a 3.05 μm thick yttri…
View article: Fabrication and Characterization of Nanoscale Periodic Ferromagnetic Structures on Superconducting Thin Films
Fabrication and Characterization of Nanoscale Periodic Ferromagnetic Structures on Superconducting Thin Films Open
This research investigates the transport properties of ferromagnetic nanostructures made by nickel or cobalt on superconducting thin films. The superconducting thin films were covered by an insulating layer, and the periodic ferromagnetic …
View article: Introduction of Routable Molded Lead Frame and its Application
Introduction of Routable Molded Lead Frame and its Application Open
리드프레임의 우수한 열적/전기적 특성을 유지하면서 많은 I/O수를 수용할 수 있는 구조, 그리고 라미네이트의 디자인 팬인(Fan-in) 및 팬아웃(Fan-out) 설계 유연성을 유지하면서 가격경쟁력을 향상 시킬 수 있는 몰딩기판(Molded substrate)을 기반으로 한 RtMLF(Routable Molded Lead Frame) 패키지를 개발하였다. 개발된 패키지의 구조적 특징을 이용하여, 열적 전기적 성능의 우수성을 …