Article
Physics, Applied
Nikolai Kuznetsov, Huajun Qin, Lukas Flajsman, Sebastiaan van Dijken
Summary: This study reports experimental results on spin-wave propagation, transmission gap tuning, and mode conversion in straight, curved, and Y-shaped yttrium iron garnet waveguides with submicrometer-wide airgrooves. The study observes forbidden frequency gaps in straight waveguides and narrowing of the gaps in curved and Y-shaped waveguides. The findings show that the spin-wave transmission signal is strongly suppressed inside the gaps and remains high at allowed frequencies for all waveguide types.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Igor Turcan, Lukas Flajsman, Ondrej Wojewoda, Vaclav Roucka, Ondrej Man, Michal Urbanek
Summary: Curvature-induced effects can tailor the response of a magnetic system, allowing spin-wave propagation in the optimal direction through modification of energy contributions by waveguide curvature.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
S. R. Lake, B. Divinskiy, G. Schmidt, S. O. Demokritov, V. E. Demidov
Summary: The study investigates the propagation of spin waves in YIG waveguides with a decreasing width and varying length transition region, leading to wavelength downconversion and almost-dispersionless propagation of spin-wave pulses. The concentration of energy in these waveguides overcomes damping effects, resulting in an overall increase in spin-wave intensity during propagation. These findings have implications for improving the efficiency and functionality of magnonic devices using spin waves as an information carrier.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Giacomo Talmelli, Daniele Narducci, Frederic Vanderveken, Marc Heyns, Fernanda Irrera, Inge Asselberghs, Iuliana P. Radu, Christoph Adelmann, Florin Ciubotaru
Summary: Spin wave modes in magnetic waveguides with width down to 320nm were studied using electrical propagating spin-wave spectroscopy and micromagnetic simulations under both longitudinal and transverse magnetic bias fields. The results showed a 1.3GHz wide spin-wave band for longitudinal bias fields, while transverse bias fields led to several distinct bands corresponding to different quantized width modes. Micromagnetic simulations revealed nonuniform and tilted magnetization in this geometry, resulting in spin wave dispersion relations in good agreement with experimental observations.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Marek Vanatka, Krzysztof Szulc, Ondrej Wojewoda, Carsten Dubs, Andrii Chumak, Maciej Krawczyk, Oleksandr Dobrovolskiy, Jaroslaw W. Klos, Michal Urbanek
Summary: The development of the variable-gap-propagating-spin-wave-spectroscopy method provides a new approach for deducing the dispersion relation of spin waves in a wide frequency and wave-number range. This method enables the analysis of spin-wave transmission between antennas with variable spacing, in conjunction with theoretical data treatment, to extract material and spin-wave parameters and validate the compatibility of microwaves with low temperatures for cryogenic magnonics at the nanoscale.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Jean-Baptiste Touchais, Pascal Simon, Andrej Mesaros
Summary: In this study, the theoretical investigation of domain walls in spin-orbit coupling in graphene is conducted, aiming to find robust one-dimensional propagating electronic states. Surprisingly, it is found that a sign-changing domain wall in valley-Zeeman spin-orbit coupling binds two robust Kramers pairs.
Article
Materials Science, Characterization & Testing
Chaolong Xue, Jiaqi Wang, Zhiyuan Zhang, Yunfei Zhang, Sijia Zuo, Bing Li
Summary: This paper investigates the propagation of guided waves, particularly Lamb waves, in plate-like structures with variable thicknesses. The characteristics of Lamb modes and SH0 mode in variable thickness plates are compared, and the non-dispersive property of the SH0 mode is demonstrated. Experimental results validate the effectiveness of the SH0 mode for defect localization in such structures.
NDT & E INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
H. Merbouche, B. Divinskiy, K. O. Nikolaev, C. Kaspar, W. H. P. Pernice, D. Gouere, R. Lebrun, V Cros, J. Ben Youssef, P. Bortolotti, A. Anane, S. O. Demokritov, V. E. Demidov
Summary: This study demonstrates the complexity of nonlinear wave processes in microscopic magnetic structures and emphasizes the importance of understanding them for technical applications of spin waves in integrated devices.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
L. C. Garcia de Andrade
Summary: This study focuses on spin-1 and spin-0 torsion wave modes in linearized teleparallelism, revealing scalar torsion waves and gravitational waves generated by contortion tensors. A thought experiment involving a gravitational-torsion wave hitting a ring of spinless particles is proposed, showing agreement with strain estimates from a real-world LIGO experiment. The model also investigates the physical implications of contortion through analysis of GW energy pseudo-tensors and axial torsion vectors.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Applied
Danilo Braghini, Luis G. G. Villani, Matheus I. N. Rosa, Jose R. de F. Arruda
Summary: This work investigates non-Hermitian elastic waveguides with periodically applied proportional feedback efforts, showing non-reciprocal frequency components in dispersion diagrams and the effects of feedback sign and locality on wave propagation. The results contribute to designing metamaterials with novel properties and potential technological applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Chendong Jin, Shuang Li, Hu Zhang, Ruining Wang, Jianglong Wang, Ruqian Lian, Penglai Gong, Xingqiang Shi
Summary: We report on the resonance excitations and spin-wave modes of a single bimeron in a confined nanodot through micromagnetic simulations. Our results show that the spin-wave modes of bimerons rotate in-plane and can be influenced by the angle of the applied microwave magnetic field. We also find that bimerons exhibit various spin-wave modes, which may have important implications for spintronics and magnonics applications.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
Felix Gross, Mateusz Zelent, Ajay Gangwar, Slawomir Mamica, Pawel Gruszecki, Matthias Werner, Gisela Schuetz, Markus Weigand, Eberhard J. Goering, Christian H. Back, Maciej Krawczyk, Joachim Graefe
Summary: Experimental imaging of edge-localized spin wave modes in antidot lattices and the formation of spin wave dragonfly patterns at higher frequencies have been demonstrated. The dragonfly modes require the propagating mode as an energy mediator, and additional dispersion branches exist for a tilted external field geometry.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Chendong Jin, Shuang Li, Hu Zhang, Ruining Wang, Jianglong Wang, Ruqian Lian, Penglai Gong, Xingqiang Shi
Summary: In this study, the ground state and spin-wave modes of a single elliptical skyrmion in a confined nanodot were investigated using micromagnetic simulations. The shape of the skyrmion was found to vary depending on the strength of the anisotropic Dzyaloshinskii-Moriya interaction (DMI). Exciting the elliptical skyrmions with in-plane or out-of-plane ac magnetic fields resulted in different spin-wave modes, including rotation and breathing modes.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Applied
Rhodri Mansell, Taddaus Schaffers, Rasmus B. Hollander, Huajun Qin, Sebastiaan van Dijken
Summary: This paper uses micromagnetic simulations to study the interaction between spin waves and skyrmions. By altering the size of the skyrmion, the emitted spin wave profile can be controlled.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Julia Kharlan, Vladyslav Borynskyi, Sergey A. Bunyaev, Pavlo Bondarenko, Olga Salyuk, Vladimir Golub, Alexander A. Serga, Oleksandr Dobrovolskiy, Andrii Chumak, Roman Verba, Gleb N. Kakazei
Summary: In this study, the unconventional single-frequency resonance response of flat circular Permalloy nanodots under a certain critical angle of magnetic field is observed. This phenomenon can be explained by micromagnetic simulations and analytical theory, and provides a way to create spin-wave systems with spectrally narrow magnetic noise.
Article
Physics, Condensed Matter
Denis Dyck, Andreas Becker, Jungwoo Koo, Tristan Matalla-Wagner, Jan Krieft, Guenter Reiss
Summary: The investigation on sputter-deposited ferromagnetic Weyl semimetal (WSM) and full-Heusler compound Co2TiGe shows formation of L2(1) crystal structure, close agreement of magnetization measurements with calculated values, a Curie temperature of 378.5 K, and domination of Coulomb interaction in resistance above 60 K. The Hall measurements indicate positive ordinary Hall and anomalous Hall constants, as well as a positive dependence on temperature. Skew scattering and intrinsic mechanisms contribute to the anomalous Hall resistivity, reflecting a higher than usual intrinsic contribution expected for WSMs. However, the expected relation between the longitudinal and the anomalous Hall conductivity is not met.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Review
Physics, Condensed Matter
Anjan Barman, Gianluca Gubbiotti, S. Ladak, A. O. Adeyeye, M. Krawczyk, J. Grafe, C. Adelmann, S. Cotofana, A. Naeemi, V. Vasyuchka, B. Hillebrands, S. A. Nikitov, H. Yu, D. Grundler, A. Sadovnikov, A. A. Grachev, S. E. Sheshukova, J-Y Duquesne, M. Marangolo, G. Csaba, W. Porod, V. E. Demidov, S. Urazhdin, S. O. Demokritov, E. Albisetti, D. Petti, R. Bertacco, H. Schultheiss, V. V. Kruglyak, V. D. Poimanov, S. Sahoo, J. Sinha, H. Yang, M. Munzenburg, T. Moriyama, S. Mizukami, P. Landeros, R. A. Gallardo, G. Carlotti, J- Kim, R. L. Stamps, R. E. Camley, B. Rana, Y. Otani, W. Yu, T. Yu, G. E. W. Bauer, C. Back, G. S. Uhrig, O. Dobrovolskiy, B. Budinska, H. Qin, S. van Dijken, A. Chumak, A. Khitun, D. E. Nikonov, I. A. Young, B. W. Zingsem, M. Winklhofer
Summary: Magnonics is a burgeoning research field that focuses on utilizing spin waves to transmit, store, and process information, showing significant progress in the past decade. The key challenges include excitation of sub-100 nm wavelength magnons, manipulation on the nanoscale, and creation of sub-micrometre devices using low-Gilbert damping magnetic materials. Magnonics offers advantages such as lower energy consumption, easier integrability, compatibility with CMOS structure, reprogrammability, shorter wavelength, smaller device features, anisotropic properties, negative group velocity, non-reciprocity, and efficient tunability by various external stimuli.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Review
Physics, Applied
Amir Elzwawy, Hasan Piskin, Numan Akdogan, Marius Volmer, Gunter Reiss, Luca Marnitz, Anastasiia Moskaltsova, Ogan Gurel, Jan-Michael Schmalhorst
Summary: This review discusses the advantages of planar Hall effect sensors and their role in various advanced applications, as well as key parameters affecting sensor performance and structural evolution. Research contributions to the development of sensors are highlighted, with an emphasis on the importance of microfluidics and flexible sensor technology.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
B. Divinskiy, H. Merbouche, K. O. Nikolaev, S. Michaelis de Vasconcellos, R. Bratschitsch, D. Gouere, R. Lebrun, V. Cros, J. Ben Youssef, P. Bortolotti, A. Anane, S. O. Demokritov, V. E. Demidov
Summary: The study investigates the propagation of nanosecond spin-wave pulses in microscopic waveguides made of nanometer-thick yttrium iron garnet films. It shows that dispersion leads to broadening of the pulse for most spin-wave frequencies, but can be suppressed leading to dispersionless pulse propagation in certain frequency intervals. This phenomenon is caused by competing effects of dipolar and exchange interactions, which can be controlled by varying the waveguide geometry.
PHYSICAL REVIEW APPLIED
(2021)
Article
Nanoscience & Nanotechnology
Yubo Qi, Michael Westphal, Neita Khayya, Inga Ennen, Tobias Peters, Julian Cremer, Dario Anselmetti, Guenter Reiss, Andreas Huetten, Armin Goelzhaeuser, Petr Dementyev
Summary: Despite the challenges of synthesizing large-scale intrinsically porous planar nanomaterials, this study presents a facile method for fabricating continuous water-selective carbon nanomembranes of variable thickness from polycyclic aromatic hydrocarbons. The membranes exhibit high porosity and their performance is strongly influenced by thickness, as evidenced by permeation measurements and modeling.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
S. R. Lake, B. Divinskiy, G. Schmidt, S. O. Demokritov, V. E. Demidov
Summary: The study investigates the propagation of spin waves in YIG waveguides with a decreasing width and varying length transition region, leading to wavelength downconversion and almost-dispersionless propagation of spin-wave pulses. The concentration of energy in these waveguides overcomes damping effects, resulting in an overall increase in spin-wave intensity during propagation. These findings have implications for improving the efficiency and functionality of magnonic devices using spin waves as an information carrier.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Analytical
Martin Wortmann, Waldemar Keil, Bennet Brockhagen, Jan Biedinger, Michael Westphal, Christian Weinberger, Elise Diestelhorst, Wiebke Hachmann, Yanjing Zhao, Michael Tiemann, Guenter Reiss, Bruno Huesgen, Claudia Schmidt, Klaus Sattler, Natalie Frese
Summary: The study investigated the effects of temperature changes during pyrolysis on the chemical composition, morphology, and crystallinity of hydrochar, revealing the formation of oxygen-rich nanoclusters below 700 degrees Celsius which decompose below 750 degrees Celsius, leaving behind uniformly sized pores that result in a surface area of up to 480 m2/g.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Physics, Applied
Samer Kurdi, Yuya Sakuraba, Keisuke Masuda, Hiroo Tajiri, Bhaskaran Nair, Guillaume F. Nataf, Mary E. Vickers, Guenter Reiss, Markus Meinert, Sarnjeet S. Dhesi, Massimo Ghidini, Zoe H. Barber
Summary: In this study, the effect of anti-site disorder on the half-metallic properties of a Mn2FeAl Heusler alloy thin film was investigated. The film was grown on TiN-buffered MgO 001 substrates via magnetron sputtering. It was found that the formation of a partially disordered L2(1) B structure due to anti-site disorder led to the deviation from half-metallic behavior.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
B. Divinskiy, H. Merbouche, V. E. Demidov, K. O. Nikolaev, L. Soumah, D. Gouere, R. Lebrun, V Cros, Jamal Ben Youssef, P. Bortolotti, A. Anane, S. O. Demokritov
Summary: Magnons, quantised magnetic excitations, can be driven into a Bose-Einstein condensation (BEC) state even at room temperature. The research demonstrates the possibility of achieving stationary equilibrium room-temperature magnon BEC via a spin-current, paving the way for integrated microscopic quantum magnonic and spintronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
H. Merbouche, B. Divinskiy, K. O. Nikolaev, C. Kaspar, W. H. P. Pernice, D. Gouere, R. Lebrun, V Cros, J. Ben Youssef, P. Bortolotti, A. Anane, S. O. Demokritov, V. E. Demidov
Summary: This study demonstrates the complexity of nonlinear wave processes in microscopic magnetic structures and emphasizes the importance of understanding them for technical applications of spin waves in integrated devices.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
S. R. Lake, B. Divinskiy, G. Schmidt, S. O. Demokritov, V. E. Demidov
Summary: Phase-resolved imaging is used to study the nonlinear modification of wavelength in spin wave propagation. It is found that using moderate microwave power can generate spin waves with large amplitudes, and large precession angles lead to strong spatial dependence of wavelength. These findings are important for optimizing nonlinear integrated spin-wave signal-processing devices.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
S. R. Lake, B. Divinskiy, G. Schmidt, S. O. Demokritov, V. E. Demidov
Summary: Magnonics utilizes both the amplitude and phase of spin waves, with tunable phase shifters being crucial elements for magnonic circuits. This study demonstrates that intrinsic magnetic nonlinearities enable efficient microscopic tunable phase shifters controlled by wave intensity. The phase shift tunability can reach over 360 degrees with a few milliwatts of microwave power, showing promise for integrated nano-magnonics in computing beyond Moore's Law.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Hugo Merbouche, Martin Collet, Michael Evelt, Vladislav E. Demidov, Jose Luis Prieto, Manuel Munoz, Jamal Ben Youssef, Gregoire de Loubens, Olivier Klein, Stephane Xavier, Olivier D'Allivy Kelly, Paolo Bortolotti, Vincent Cros, Abdelmadjid Anane, Sergej O. Demokritov
Summary: Magnonics rely on the wave nature of magnetic excitations to process information at frequencies between a few GHz to tens of GHz, suitable for operation in radio-frequency bands for 4G and 5G telecommunications. A micron-scale magnonic crystal was used to demonstrate radio-frequency signal filtering with a frequency selectivity of 20 MHz at an operating frequency of 4.9 GHz, providing insight into the physics of SW propagation in periodically modulated nanoscale structures.
ACS APPLIED NANO MATERIALS
(2021)
