Article
Physics, Applied
Vipul Sharma, Vinay Sharma, Ram Krishna Ghosh, Bijoy Kumar Kuanr
Summary: This study presents a detailed investigation of spin pumping from the full Heusler compound Co2FeSi (CFS) to single-layer two-dimensional transition metal dichalcogenide (TMD) MoS2 excited by ferromagnetic resonance. The results indicate significant enhancement of Gilbert damping in Si/SiO2/MoS2/CFS heterostructures compared to bare Si/SiO2/CFS samples, establishing a clear sign of ferromagnetic resonance induced spin pumping. The spin-to-charge conversion process has also been quantified using inverse spin Hall effect measurements. These findings provide important insights into the spin angular momentum transfer at the interface of 2D TMDs and ferromagnet bilayer systems.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Yury P. Kabanov, Robert D. Shull, Chao Zheng, Philip W. T. Pong, Daniel B. Gopman
Summary: The in-plane magnetization reversal behavior of the Co2FeSi Heusler alloy free layer within a bottom-pinned magnetic tunnel junction film is studied, revealing anisotropic behavior under applied magnetic fields. Smooth, coherent rotation away from the easy axis is observed under in-plane fields perpendicular to the exchange bias direction, while asymmetric reversal behavior is seen along the easy axis.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
M. Salaheldeen, A. Garcia-Gomez, P. Corte-Leon, M. Ipatov, V Zhukova, J. Gonzalez, A. Zhukov
Summary: In this study, Co2FeSi Heusler alloy glass-covered microwires were successfully fabricated and their magnetic properties were investigated. The annealing conditions were found to have a strong influence on the magnetic behavior of the samples. Anomalous magnetic behavior was observed in the annealed samples, and the structural properties were analyzed. These findings are important for the design of devices based on magnetization switching.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
He Sun, Liwei Jiang, Yisong Zheng
Summary: This paper focuses on the electrical and magnetic properties of a thin film cleaved from the nonmagnetic half-Heusler compound CoTiSb. Through first-principles calculations, it is found that the surface of TiSb termination possesses ferrimagnetism, which can be tuned to nonmagnetism by gate-induced hole doping. This magnetic tunability provides a platform for realizing a pseudo-spin valve without hetero-interfaces.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Sajib Biswas, Saumen Chaudhuri, Niladri Kander, Srimanta Mitra, Suman Guchhait, Amal Kumar Das
Summary: The performance of spintronic devices is highly dependent on spin polarization, as shown in calculations and experiments on Co2FeSi alloys. Both L2(1)-ordered and B2-disordered structures exhibit decreased spin polarization but increased total magnetic moment. Additionally, the accumulation of spin-polarized carriers in p-type silicon from Co2FeSi film was demonstrated, along with a prominent spin-valve effect at low temperature in the device.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
M. Salaheldeen, A. Garcia, P. Corte-Leon, M. Ipatov, V. Zhukova, A. Zhukov
Summary: This article presents a new Co2FeSi glass-coated microwire with a nanocrystalline structure obtained using the Taylor-Ulitovsky technique. The annealing process significantly increased the size of the nanograins and resulted in the observation of perfect square hysteresis loops. The annealed samples exhibited dramatic magnetic behavior at low temperatures and showed critical temperature points where the magnetic behavior changed. The anomalous magnetic behavior can be attributed to the coexistence of ordered and disordered phases induced by annealing conditions. The presence of the glass coating influenced the magnetization behavior and mechanical properties of the Co2FeSi microwires.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Estiaque H. Shourov, Patrick J. Strohbeen, Dongxue Du, Abhishek Sharan, Felipe C. de Lima, Fanny Rodolakis, Jessica L. McChesney, Vincent Yannello, Anderson Janotti, Turan Birol, Jason K. Kawasaki
Summary: This study measures the electronic structure of the half-Heusler compound FeVSb and reveals a mass renormalization phenomenon in filled shell compounds with no added Coulomb repulsion. The results are in quantitative agreement with dynamical mean-field theory calculations, highlighting the many-body origin of the mass renormalization.
Article
Physics, Condensed Matter
Biplab Bag, Rajendra Loke, Birender Singh, A. Thamizhavel, Bahadur Singh, S. Ramakrishnan
Summary: In this study, we investigated the superconducting state properties and electronic structure of ScAu2Al, a full Heusler material. Our results show that ScAu2Al exhibits the highest superconducting transition temperature among the Heusler superconductors and belongs to the moderate type-II superconductors. The electron-phonon coupling constant in ScAu2Al is found to be the highest among the reported Heusler superconductors, indicating the significant role of electron-phonon coupling in mediating superconductivity.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
S. Parajuli, C. Cheng, J. W. Wei, K. G. Martuza, M. Irfan, X. M. Zhang, K. Javed, J. F. Feng, X. F. Han
Summary: One-dimensional nanogeometries of Ni2FeGa have been fabricated in AAO templates using electrodeposition technique, showing ferromagnetic behavior from low temperatures to room temperature. The difference in magnetic properties between nanowires and nanotubes is mainly attributed to the anisotropy field.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jie Chen, Hang Li, Bei Ding, Peng Chen, Tengyu Guo, Xing Xu, Dongfeng Zheng, Hongwei Zhang, Xuekui Xi, Wenhong Wang
Summary: The study found a large unconventional anomalous Hall signal in DyPtBi, with even larger effects observed at certain angles. Furthermore, DyPtBi achieved a giant planar anomalous Hall angle of up to 30%, indicating that this material is a good platform for investigating unconventional AHE and other novel physical properties.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Miao Jiang, Eisuke Matsushita, Yota Takamura, Le Duc Anh, Shigeki Nakagawa, Shinobu Ohya, Masaaki Tanaka
Summary: To optimize the performance of MRAM devices, achieving current-induced spin-orbit torque magnetization switching in perpendicularly magnetized full Heusler alloys is important. Using low-resistivity Pd as a spin current source in Co2FeSi, full SOT switching is achieved with high efficiency, potentially due to lattice matching and additional SOTs induced by in-plane spin components.
Article
Multidisciplinary Sciences
Karolina Gornicka, Gabriel Kuderowicz, Michal J. Winiarski, Bartlomiej Wiendlocha, Tomasz Klimczuk
Summary: Polycrystalline LiGa2Ir with a Heusler-type crystal structure has been prepared and confirmed to exhibit bulk superconductivity with Tc = 2.94 K. The electronic structure, lattice dynamics, and electron-phonon interaction were studied, revealing the electron-phonon mechanism for the superconductivity in LiGa2Ir. LiGa2Ir and LiGa2Rh are the only two known representatives of Heusler superconductors with a valence electron count of 16.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Yuichi Fujita, Taisuke Sasaki, Yuya Sakuraba
Summary: This article demonstrates the process of improving the surface morphology of an epitaxial NbN layer and the epitaxial growth of a Co-based Heusler alloy, Co2FeSi, film on the surface-flattened NbN epilayer. By using Cr buffer layers and post-deposition annealing, the surface roughness of the NbN layers is successfully suppressed, resulting in atomically flat interfaces with the CFS layers. However, minor diffusion of N atoms from the NbN layer into the Cr buffer layer is observed, which may affect the crystallinity of the NbN layer.
Article
Chemistry, Multidisciplinary
Ankit K. Sharma, Jagannath Jena, Kumari Gaurav Rana, Anastasios Markou, Holger L. Meyerheim, Katayoon Mohseni, Abhay K. Srivastava, Ilya Kostanoskiy, Claudia Felser, Stuart S. P. Parkin
Summary: Magnetic nano-objects, including antiskyrmions and Bloch skyrmions, have been discovered in epitaxial thin films of Mn2RhSn. These nano-objects vary in size and exhibit stability similar to single-crystalline lamellae, but do not form well-defined arrays due to possible chemical ordering homogeneity issues in the thin films. Despite this, evidence of elliptically distorted nano-objects along perpendicular crystallographic directions has been found, suggesting a potential use in magnetic memory elements.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
R. S. Malik, E. K. Delczeg-Czirjak, R. Knut, D. Thonig, I Vaskivskyi, D. Phuyal, R. Gupta, S. Jana, R. Stefanuik, Y. O. Kvashnin, S. Husain, A. Kumar, P. Svedlindh, J. Soderstrom, O. Eriksson, O. Karis
Summary: This report investigates optically induced ultrafast magnetization dynamics in the Heusler alloy Co2FeAl, finding that the demagnetization time is independent of structural order and the magnetization recovery time correlates strongly with the Gilbert damping parameter. The remagnetization process in Co2FeAl is dominated by magnon dynamics, with potential general applicability.
Article
Materials Science, Multidisciplinary
Pascal Frey, Vitaliy I. Vasyuchka, Burkard Hillebrands, Alexander A. Serga
Summary: Interactions between quasiparticles of different nature, such as magnons and phonons in a magnetic medium, significantly change the spectrum of both types of quasiparticles. The hybridization of magnons and phonons can lead to the manipulation of the position of the magnon gas in wavevector space. The thermalization processes of exchange and dipole magnons result in their accumulation in different areas and eventual separation in real space.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
Moritz Geilen, Alexandra Nicoloiu, Daniele Narducci, Morteza Mohseni, Moritz Bechberger, Milan Ender, Florin Ciubotaru, Burkard Hillebrands, Alexandru Muller, Christoph Adelmann, Philipp Pirro
Summary: This study reports the resonant excitation of spin waves in micro-structured magnetic thin films by short-wavelength surface acoustic waves (SAWs), demonstrating the conservation and full transfer of energy and momentum from SAW to spin waves. These findings pave the way for miniaturized magneto-elastic spin-wave emitters for magnon computing.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Morteza Mohseni, Vitaliy I. Vasyuchka, Victor S. L'vov, Alexander A. Serga, Burkard Hillebrands
Summary: This work focuses on classical analogs for quantum computing schemes, demonstrating the manipulation of a magnon condensate using wavevector-selective parametric pumping. It shows the possibility of Rabi-like oscillations in the wavevector domain and provides a significant stimulus in the field of qubit functionality and classical systems.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Paul Burger, Gyanendra Singh, Christer Johansson, Carlos Moya, Gilles Bruylants, Gerhard Jakob, Alexei Kalaboukhov
Summary: Magnetic nanoparticles (MNPs) are important for fabrication of tailored nanomagnetic structures. In this study, precise and controllable manipulation of individual magnetite MNPs using atomic force microscope was demonstrated. Placing MNPs on a two-dimensional electron gas and observing hysteresis loop verified the approach. Additionally, the effective coercivity of the hysteresis loop could be changed by altering the cooling field angle, which is related to the alignment of magnetic moment along the easy axis in magnetite.
Article
Physics, Applied
G. Masciocchi, J. W. van Der Jagt, M-A Syskaki, A. Lamperti, N. Wolff, A. Lotnyk, J. Langer, L. Kienle, G. Jakob, B. Borie, A. Kehlberger, D. Ravelosona, M. Klaeui
Summary: This study investigates the effects of post-growth He+ irradiation on the magneto-elastic properties of a Ni/Fe multi-layered stack. It is found that He+ irradiation causes progressive intermixing at the interfaces of the multilayer, allowing for tuning of the saturation magnetostriction value and even reversal of the sign of the magnetostrictive effect. The study also identifies the critical fluence at which the absolute value of the magnetostriction is significantly reduced, achieving insensitivity to strain in the magnetic stack.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
M. Taheri, S. Maaref, A. Kantzas, S. Bryant, S. Trudel
Summary: This study investigated the effect of different surfactants on the stability of PEGylated BaTiO3 nanoparticles in water and ethylene glycol. The results showed that the anionic surfactant acted as the best stabilizer, while the cationic surfactant was the least favorable stabilizer.
Article
Engineering, Electrical & Electronic
A. Magni, G. Carlotti, A. Casiraghi, E. Darwin, G. Durin, L. Herrera Diez, B. J. Hickey, A. Huxtable, C. Y. Hwang, G. Jakob, C. Kim, M. Klaui, J. Langer, C. H. Marrows, H. T. Nembach, D. Ravelosona, G. A. Riley, J. M. Shaw, V. Sokalski, S. Tacchi, M. Kuepferling
Summary: Experimental studies using magneto-optics have shown a correlation between domain wall roughness and interface roughness of sample layers, with standard creep hypothesis models unable to accurately reproduce domain wall velocity profiles under high roughness conditions. Comparison with Brillouin light scattering measurements revealed that the latter method often yields higher measured values of Dzyaloshinskii-Moriya interaction.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Physical
Katelynn M. Daly, Santiago Jimenez-Villegas, Benjamin Godwin, Martin A. W. Schoen, Oliver Calderon, Ning Chen, Simon Trudel
Summary: The storage of renewable energy is a challenge in transitioning to a power grid based on intermittent energy supplies. The electrocatalytic conversion of water to hydrogen fuel is an attractive option, but requires better catalysts for better performance. This study evaluated different RuOx catalysts and found that nanocrystalline RuOx catalysts outperform their amorphous counterparts and are more stable under alkaline conditions, which is a significant step towards using RuOx for alkaline water electrolysis.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Renaud Miclette Lamarche, Akpeko Gasonoo, Anderson Hoff, Roman Chernikov, Gregory C. Welch, Simon Trudel
Summary: This study demonstrates the formation of vanadium oxide films using a room-temperature, ambient photochemical deposition route. The films consist of V2O5 with a significant amount of V4+. The films become nanocrystalline after annealing and show no improvement in device performance when used as hole-transport layers in organic photovoltaic cells and organic light-emitting diodes.
CHEMISTRY OF MATERIALS
(2023)
Article
Physics, Multidisciplinary
Eva Schmoranzerova, Jozef Kimak, Richard Schlitz, Sebastian T. B. Goennenwein, Dominik Kriegner, Helena Reichlova, Zbynek Soban, Gerhard Jakob, Er-Jia Guo, Mathias Klaeui, Markus Muenzenberg, Petr Nemec, Tomas Ostatnicky
Summary: All-optical ferromagnetic resonance (AO-FMR) is used to detect micromagnetic parameters in yttrium iron garnet (YIG) thin films with a metallic capping layer (Au, Pt) by triggering magnetization precession through heating of the metallic layer with femtosecond laser pulses. The laser-induced precession corresponds to a uniform (Kittel) magnon mode, allowing for the measurement of local magnetic properties with a resolution determined by the laser spot size.
NEW JOURNAL OF PHYSICS
(2023)
Article
Instruments & Instrumentation
Matthias R. Schweizer, Franziska Kuehn, Malte Koster, Georg von Freymann, Burkard Hillebrands, Alexander A. Serga
Summary: Temperature variations can be used to create reconfigurable spatial structures in physical and biological objects. This paper presents an experimental optical setup for creating tunable two-dimensional temperature patterns on a micrometer scale, and demonstrates its practical application in the production of temperature-induced magnetization landscapes in ferrimagnetic yttrium iron garnet films.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Materials Science, Multidisciplinary
Arnab Bose, Fabian Kammerbauer, Rahul Gupta, Dongwook Go, Yuriy Mokrousov, Gerhard Jakob, Mathias Klaeui
Summary: We report and quantify a large orbital-Hall torque generated by Nb and Ru in this study, identified by the strong dependence of the torques on the ferromagnets. We observed a strong enhancement in the dampinglike torques measured in Nb (or Ru)/Ni bilayers compared to Nb (or Ru)/FeCoB bilayers, including a sign reversal in the case of Nb/(Ni or FeCoB) samples. Furthermore, we discovered a significant increase in the measured torques with the increase of ferromagnetic Ni thickness, which may indicate the unique signature of long-range action of the orbital-Hall torques.
Article
Physics, Multidisciplinary
Lisa Randolph, Mohammadreza Banjafar, Thomas R. Preston, Toshinori Yabuuchi, Mikako Makita, Nicholas P. Dover, Christian Roedel, Sebastian Goede, Yuichi Inubushi, Gerhard Jakob, Johannes Kaa, Akira Kon, James K. Koga, Dmitriy Ksenzov, Takeshi Matsuoka, Mamiko Nishiuchi, Michael Paulus, Frederic Schon, Keiichi Sueda, Yasuhiko Sentoku, Tadashi Togashi, Michael Bussmann, Thomas E. Cowan, Mathias Klaeui, Carsten Fortmann-Grote, Lingen Huang, Adrian P. Mancuso, Thomas Kluge, Christian Gutt, Motoaki Nakatsutsumi
Summary: Studying the ultrafast laser-induced structural changes in nanoscale systems is crucial in understanding the dynamics of intense light-matter interactions. Previous imaging methods have been unable to measure the depth-resolved subsurface dynamics of laser-solid interactions with appropriate temporal and spatial resolution, but our experimental data provides a solution with nanometer depth resolution.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Pilar Jimenez-Cavero, Oliver Gueckstock, Lukas Nadvornik, Irene Lucas, Tom S. Seifert, Martin Wolf, Reza Rouzegar, Piet W. Brouwer, Sven Becker, Gerhard Jakob, Mathias Klaeui, Chenyang Guo, Caihua Wan, Xiufeng Han, Zuanming Jin, Hui Zhao, Di Wu, Luis Morellon, Tobias Kampfrath
Summary: Spin transport is crucial for future spintronic devices. Laser-driven spin currents in F|Pt stacks are studied to identify the mechanism of spin transport, which is mediated by spin-polarized conduction electrons and/or torque between electron spins. The study reveals similar dynamics and provides an estimation of the spin-mixing conductance of the interfaces. In addition, two spin-current components with opposite directions are observed in the half-metallic ferrimagnet Fe3O4, supporting the magneto-electronic model of Fe3O4.
Review
Chemistry, Physical
Abhinandan Banerjee, Barbara Blasiak, Armita Dash, Boguslaw Tomanek, Frank C. J. M. van Veggel, Simon Trudel
Summary: There is a need for non-invasive diagnostic tools, which has led to the use of magnetic resonance imaging (MRI). High-field MRI offers advantages in terms of signal-to-noise ratio and spectral resolution. This review discusses the development of new contrast agents for high-field MRI.
CHEMICAL PHYSICS REVIEWS
(2022)
