Article
Multidisciplinary Sciences
Xiaoqian Zhang, Qiangsheng Lu, Wenqing Liu, Wei Niu, Jiabao Sun, Jacob Cook, Mitchel Vaninger, Paul F. Miceli, David J. Singh, Shang-Wei Lian, Tay-Rong Chang, Xiaoqing He, Jun Du, Liang He, Rong Zhang, Guang Bian, Yongbing Xu
Summary: Growth and properties of single- and few-layer CrTe2 on bilayer graphene by molecular beam epitaxy (MBE) have shown intrinsic ferromagnetism with a Curie temperature up to 300 K and perpendicular magnetic anisotropy, providing a new avenue for developing large-scale 2D magnet-based spintronics devices.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Fabian Samad, Gregor Hlawacek, Sri Sai Phani Kanth Arekapudi, Xiaomo Xu, Leopold Koch, Miriam Lenz, Olav Hellwig
Summary: By irradiating SAF with a low-energy He+ focused ion beam, it is possible to achieve a depth-dependent reduction in IEC and anisotropy, resulting in a specific field reversal sequence and the creation of AF domains in the irradiated regions.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Environmental
Houmei You, Jinpeng Hou, Yiwen Shen, Xiangkun Zhang, Jiaxue Cai, Yaya Zhang, Yongjun Feng, Weiliang Tian, Kewei Zhang
Summary: Solid-state light-emitting devices have advantages of low cost, high efficiency, and desirable durability. By structurally disassembling vermiculite into hydrotalcite and SiO2, high-performance fluorescent LDHs were prepared and assembled with VMT nanosheets to form ultrathin solid-state light-emitting films. The electrostatic self-assembly strategy allows precise control of chromophore localization and light-emitting intensity. This work provides a potential strategy for assembling solid-state light-emitting films and opens new applications in various optoelectronics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
N. Coton, J. P. Andres, E. Molina, M. Jaafar, R. Ranchal
Summary: In this study, the formation of stripe domains in electrodeposited Ni90Fe10 films was investigated. The characteristic fingerprint of stripe domains was observed when the electrolyte was not magnetically stirred during electrodeposition. Stripe domains were visible only by Magnetic Force Microscopy when the sample thickness exceeded the theoretical critical thickness. The induced in-plane magnetoelastic magnetic anisotropy was found to reduce the perpendicular magnetic anisotropy in samples grown in outward bent flexible substrates.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Z. Kurant, S. K. Jena, R. Gieniusz, U. Guzowska, M. Kisielewski, P. Mazalski, I Sveklo, A. Pietruczik, A. Lynnyk, A. Wawro, A. Maziewski
Summary: We studied the magnetic properties of epitaxial Pt/W(d(w))/Co(d(Co))/Pt layered films as a function of W(d(w)) and Co(d(Co)) layer thicknesses. The influence of the bottom W layer on magnetic anisotropy, spin reorientation transition, and magnetic polarization of the interface atoms was observed. Different magnetic states were observed with decreasing Co layer thickness. The transition from hard to soft magnetic material with out-of-plane magnetization was found with changing W layer thickness. The domain structures at the out-of-plane state were sensitive to both Co and W layer thicknesses as well as the external magnetic field. Dzyaloshinskii-Moriya interaction was inferred from the Brillouin light scattering measurements.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Rocio M. Gutierrez-Perez, Diego I. Zubiate-Perez, Ricardo Lopez Anton, Maria E. Fuentes-Montero, Jose T. Holguin-Momaca, Oscar O. Solis-Canto, Adriana Alvidrez-Lechuga, Juan Antonio Gonzalez, Sion F. Olive-Mendez
Summary: This study provides a comprehensive analysis of the magnetization and effective perpendicular magnetic anisotropy (PMA) of epitaxial D0(22)-Mn3+xGa ultrathin films. The growth method significantly affects the uniaxial PMA and thickness of non-magnetic layers, while the saturation magnetization remains unchanged. These results can be explained by interface structural defects caused by lattice mismatch and growth method.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Xi Chen, Shao-Long Jiang, Dong-Wei Wang, Kang Yang, Jin-Hui Lu, Guang-Hua Yu
Summary: The effect of ultrathin Fe layer on perpendicular magnetic anisotropy (PMA) in Co/Pt multilayers was investigated. The position of the Fe layer at the interface strongly influenced the PMA. When the Fe layer was doped at the Co/Pt interface, the PMA decreased monotonically with increasing Fe layer thickness. However, when the Fe layer was doped at the Pt/Co interface, the PMA showed a peak at a specific thickness. The variation in PMA is mainly attributed to the tuning of electron occupation states at Fe-doped Pt/Co interface.
Article
Chemistry, Physical
Dimitrios I. Anyfantis, Camillo Ballani, Nikos Kanistras, Alexandros Barnasas, Ioannis Tsiaoussis, Georg Schmidt, Evangelos Th. Papaioannou, Panagiotis Poulopoulos
Summary: Co/CoO multilayers were fabricated using radio-frequency magnetron sputtering. Platinum was used as buffer and capping layers, as well as an ultrathin intermediate layer to enhance perpendicular magnetic anisotropy. Three samples were compared based on magnetic anisotropies and exchange bias. The use of a magnetic substrate resulted in loops with large remanence and significant exchange bias. These samples have potential applications in spintronics and magnetic storage.
Article
Chemistry, Multidisciplinary
Qinwen Lu, Zhiwei Liu, Qun Yang, Hui Cao, Purnima Balakrishnan, Qing Wang, Long Cheng, Yalin Lu, Jian-Min Zuo, Hua Zhou, Patrick Quarterman, Shin Muramoto, Alexander J. Grutter, Hanghui Chen, Xiaofang Zhai
Summary: This study discovers unexpected soft ferromagnetism in ultrathin freestanding LaMnO3 films, both in the in-plane and out-of-plane directions. This finding is important for nanoscale devices, and the ultrathin freestanding films are compatible with Si-based devices.
Article
Chemistry, Multidisciplinary
Yuta Sasaki, Ryoya Hiramatsu, Yohei Kota, Takahide Kubota, Yoshiaki Sonobe, Akimasa Sakuma, Koki Takanashi, Shinya Kasai, Yukiko K. Takahashi
Summary: This study investigates the sub-terahertz magnetization precessional motion in Cu2Sb-type MnAlGe and (Mn-Cr)AlGe films using an all-optical pump-probe method. The materials exhibit large perpendicular magnetic anisotropy in nanoscale regions and TEM images confirm the pseudo-2D crystal structures. Cr substitution in (Mn-Cr)AlGe decreases the intrinsic magnetic damping constant, resulting in a magnetization precession frequency of 0.164 THz and small effective magnetic damping constant of 0.012.
Article
Materials Science, Multidisciplinary
B. Brahma, Pratap Behera, S. Ravi, R. Brahma, S. K. Srivastava
Summary: This study prepared a series of multilayer thin films to investigate the effect of Cu insertion layer on magnetic properties, and found that the coercivity values increase with the thickness of the Cu insertion layer.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Viet Duc Duong, Phuoc Cao Van, Trinh Nguyen Thi, Ha Yeong Ahn, Viet Anh Cao, Junghyo Nah, Ganghwi Kim, Ki-Suk Lee, Ji-Wan Kim, Jong-Ryul Jeong
Summary: In this study, we investigated the magnetic properties of thulium iron garnet (TmIG) thin films grown on gadolinium gallium garnet (GGG) substrates. We controlled the annealing temperature, thickness, and roughness of the films to achieve perpendicular magnetic anisotropy (PMA) and large coercive field, important for non-volatile magnetic memory device applications. The results showed that the annealing temperature was a crucial parameter for controlling the film surface quality and engineering the direction of magnetic anisotropy. By further optimizing the film thickness, we achieved the best condition for PMA films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
P. Mazalski, L. Ohnoutek, I Sveklo, L. Beran, Z. Kurant, W. Powroznik, A. Wawro, M. O. Liedke, M. Butterling, A. Wagner, J. Fassbender, J. Hamrle, R. Antos, V Kletecka, M. Veis, A. Maziewski
Summary: The irradiation of X/Co 3 nm/Y (where X, Y = Au, Pt) trilayers with Ga+ ions results in interface broadening and surface etching, affecting the magnetic properties. Different miscibility of atoms at the Co/Pt and Co/Au interfaces leads to varying levels of intermixing and influences magnetic anisotropy. Substitution of Au instead of Pt enhances perpendicular magnetic anisotropy.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Physical
Shekhar Tyagi, V. G. Sathe, Gaurav Sharma, Rajeev Rawat
Summary: In this study, epitaxial thin films of SrRuO3 with large strain disorder were grown using pulsed laser deposition on LSAT and SrTiO3 substrates. Magnetic force microscopy was used to visualize the evolution of magnetic domains across the two transitions in these films. The results showed that the magnetic anisotropy in the films was different for the two transitions, with perpendicular magnetic anisotropy dominating. Raman spectroscopy revealed a strong influence of magnetic order on the lattice, indicating a strong spin-phonon coupling.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
A. Talapatra, J. Arout Chelvane, J. Mohanty
Summary: The research reveals that high ion irradiation doses lead to changes in the magnetic properties of amorphous Tb-Fe-Co films, and the form of magnetic domain modification transitions from rapid domain wall motion to nucleation and propagation of reverse domains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
T. Strusch, K. Lenz, R. Meckenstock, R. Bali, J. Ehrler, J. Lindner, J. Fassbender, M. Farle, K. Potzger, A. Semisalova
Summary: In this study, we investigate the spin pumping efficiency and determine the spin mixing conductance and spin diffusion length in thin bilayer films based on 3d transition metal alloy Fe60Al40. We demonstrate that the Fe60Al40 alloy exhibits dual functionality in spin pumping structures, which may have potential value in spintronic applications.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
A. Frej, C. S. Davies, A. Kirilyuk, A. Stupakiewicz
Summary: Recently, researchers have discovered that the excitation of optical phonon modes at resonance offers a promising energy-efficient pathway for ultrafast magnetization switching. In this study, the characteristics of different optical phonon modes in cobalt-doped yttrium iron garnet were explored using time-resolved pump-probe measurements. By rotating the linear polarization of both the pump and probe, a wide spectrum of optical phonons within the frequency band of 3-11 THz was identified. The lifetime of a phonon mode with an eigenfrequency of 3.4 THz was determined to be up to 13 ps, which makes it the most promising candidate for ultrafast phononic switching of magnetization in garnets.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Ruslan Salikhov, Igor Ilyakov, Lukas Koerber, Attila Kakay, Rodolfo A. Gallardo, Alexey Ponomaryov, Jan-Christoph Deinert, Thales V. A. G. de Oliveira, Kilian Lenz, Juergen Fassbender, Stefano Bonetti, Olav Hellwig, Juergen Lindner, Sergey Kovalev
Summary: Engineering of spin-orbit interactions in a magnetic multilayered structure enables the coherent generation of spin waves using terahertz radiation, benefiting spintronic device development. By exploiting relativistic spin-orbit torques confined to metal/ferromagnet interfaces, we improve light-matter interaction and successfully excite spin-wave modes with frequencies up to 0.6 THz and wavelengths as short as 6 nm using broadband terahertz radiation. Our results have broad applicability and offer the potential for nanoscale control of high-frequency signals.
Article
Multidisciplinary Sciences
Pavlo Makushko, Tobias Kosub, Oleksandr Pylypovskyi, Natascha Hedrich, Jiang Li, Alexej Pashkin, Stanislav Avdoshenko, Rene Huebner, Fabian Ganss, Daniel Wolf, Axel Lubk, Maciej Oskar Liedke, Maik Butterling, Andreas Wagner, Kai Wagner, Brendan J. Shields, Paul Lehmann, Igor Veremchuk, Juergen Fassbender, Patrick Maletinsky, Denys Makarov
Summary: This study explores flexomagnetism in Cr2O3 thin films and demonstrates that mechanical strain gradient can impact magnetic phase transition. The flexomagnetic effect allows antiferromagnetic ordering to persist at higher temperatures, making it potentially relevant for industrial applications.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Vadym Iurchuk, Javier Pablo-Navarro, Tobias Hula, Ryszard Narkowicz, Gregor Hlawacek, Lukas Koerber, Attila Kakay, Helmut Schultheiss, Juergen Fassbender, Kilian Lenz, Juergen Lindner
Summary: Localized dynamical modes in 1D spin-wave conduits were studied using microresonator ferromagnetic resonance technique. By trimming the edges of the microstrip and creating nano gaps, additional resonances emerged, which were attributed to modes localized at the inner edges of the strips. Micromagnetic simulations confirmed the localization of the lowest-energy modes and their tunability by changing the spatial separation between the microstrips.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Oleksii M. Volkov, Daniel Wolf, Oleksandr V. Pylypovskyi, Attila Kakay, Denis D. Sheka, Bernd Buechner, Juergen Fassbender, Axel Lubk, Denys Makarov
Summary: Chiral effects originate from the lack of inversion symmetry within the lattice unit cell or sample's shape. Being mapped onto magnetic ordering, chirality enables topologically non-trivial textures with a given handedness. In this study, the existence of a static 3D texture characterized by two magnetochiral parameters, magnetic helicity of the vortex and geometrical chirality of the core string, is demonstrated in a geometrically curved asymmetric permalloy cap.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Diana Isabel Sandoval Bojorquez, Zeljko Janicijevic, Brenda Palestina Romero, Eduardo Sergio Oliveros Mata, Markus Laube, Anja Feldmann, Alexandra Kegler, Laura Drewitz, Ciaran Fowley, Jens Pietzsch, Juergen Fassbender, Torsten Tonn, Michael Bachmann, Larysa Baraban
Summary: Detection of COVID-19-associated antigens and respective antibodies is achieved using an interdigitated gold nanowire-based impedance nanobiosensor. The sensor devices demonstrate high sensitivity and a low limit of detection for the antibodies and virus antigen. Clinical plasma samples analysis shows the applicability of this platform in determining the infection or immunity status of patients.
Article
Physics, Applied
A. Frej, C. S. Davies, A. Kirilyuk, A. Stupakiewicz
Summary: In this study, the authors experimentally and numerically investigate the magnetization dynamics induced by laser in iron garnets. By exciting with an infrared pulse and applying an external magnetic field, spatially varying magnetization precession is observed, and the phase of magnetization precession is found to depend on the direction of the external magnetic field. Micro-magnetic simulations effectively describe the effects of laser-induced changes in the crystal's magneto-elastic energy on magnetization precession and switching.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
T. Zalewski, A. Maziewski, A. Stupakiewicz
Summary: We investigated the single-domain switching of magnetization in Co-doped iron garnet films using a femtosecond laser pulse and time-resolved magneto-optical imaging. By tuning the pump laser fluence, we observed picosecond magnetization dynamics in a single bubble domain with a diameter of a few micrometers. This could potentially enable cold photo-magnetic recording in magnetic bits approaching the nano-scale.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Lukas Koerber, Christopher Heins, Tobias Hula, Joo-Von Kim, Sonia Thlang, Helmut Schultheiss, Juergen Fassbender, Katrin Schultheiss
Summary: Magnons are elementary excitations in magnetic materials that can undergo nonlinear multimode scattering processes. By harnessing the interaction between magnon modes, pattern recognition can be achieved. Experimental results show that different azimuthal modes can be excited through three-magnon scattering, with amplitude dependent on the input sequences. Recognition rates as high as 99.4% can be achieved for four-symbol sequences using scattered modes, even in the presence of amplitude noise.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jan Kisielewski, Pawel Gruszecki, Maciej Krawczyk, Vitalii Zablotskii, Andrzej Maziewski
Summary: Investigated the formation of periodic magnetic domains caused by propagating spin waves in magnetic materials and discussed the significance of this phenomenon.
Article
Materials Science, Multidisciplinary
A. Frej, I Razdolski, A. Maziewski, A. Stupakiewicz
Summary: We analyze the nonlinear regime of photoinduced coherent magnetization dynamics in cobalt-doped yttrium iron garnet films experimentally and numerically. The spin subsystem shows a strongly nonlinear response and an increase in effective Gilbert damping under photomagnetic excitation with femtosecond laser pulses. The anharmonicity of the magnetic energy landscape is found to be the source of this nonlinearity. Numerical simulations and the Landau-Lifshitz-Gilbert equation confirm the key role of cubic symmetry in reaching the nonlinear spin precession regime. These findings contribute to the understanding of laser-induced nonlinear spin dynamics and the development of applied photomagnetism.
Article
Materials Science, Multidisciplinary
C. Swindells, H. Glowinski, Y. Choi, D. Haskel, P. P. Michalowski, T. Hase, F. Stobiecki, P. Kuswik, D. Atkinson
Summary: The study focused on the damping and spin transport in spintronic multilayered systems, revealing that the thickness increase of a Cu or Au spacer layer between the ferromagnet and the Pt layer leads to a rapid decrease in Pt proximity-induced magnetism (PIM) and damping, with a relationship that depends on the spacer layer material. Inserting a Cu spacer layer within the Pt showed a measurable increase in damping, while inserting an Au layer had almost no effect.
