Article
Chemistry, Multidisciplinary
Cristina Balan, Johannes W. van de Jagt, Aymen Fassatoui, Jose Pena Garcia, Vincent Jeudy, Andre Thiaville, Marlio Bonfim, Jan Vogel, Laurent Ranno, Dafine Ravelosona, Stefania Pizzini
Summary: This research illustrates the effect of He+ irradiation on the magnetization reversal and domain wall dynamics of Pt/Co/AlOx trilayers. It is found that irradiation significantly decreases the depinning field of domain walls, allowing them to reach higher velocities at lower magnetic fields. It is also observed that larger He+ fluences lead to the formation of stable magnetic skyrmions with smaller sizes, in agreement with theoretical models for ultrathin films with labyrinthine domains.
Article
Physics, Applied
Xiuping Zhou, Hanyu Ren, Congying Jiang, Fan Wang, Xinyan He, Zhenzhen Chen, Yang Qiu, Mingmin Zhu, Guoliang Yu, Haomiao Zhou
Summary: In this study, we demonstrate the controlled injection of domain walls (DWs) in a ferromagnetic nanostrip using spin-transfer torque (STT), enabled by modified perpendicular magnetic anisotropy (PMA) in Pt/Co. The presence of a 90-degree magnetized transition region is shown to be crucial for the injection process, with the generation frequency of DWs being reversibly controlled in the MHz to multi-GHz range. These findings highlight the feasibility of a highly tunable and direct-current-controlled transverse in-plane DW signal source, which has potential applications in compact and integrated DW circuits and oscillators.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Kevin J. A. Franke, Colin Ophus, Andreas K. Schmid, Christopher H. Marrows
Summary: Through micromagnetic simulations and analytical modeling, it has been found that Neel walls can be formed even in the absence of a Dzyaloshinskii-Moriya interaction, but with uniaxial in-plane magnetic anisotropy. The ability to switch between Bloch and Neel walls can be achieved via modulation of both in-plane and perpendicular magnetic anisotropy, opening up possibilities for electric field control of domain wall type with small applied voltages.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Maria Ameziane, Rhodri Mansell, Ville Havu, Patrick Rinke, Sebastiaan van Dijken
Summary: This study demonstrates the reversible voltage-controlled switching between perpendicular and in-plane magnetization states in a Co-Pt bilayer using solid-state lithium-ion battery technology. Due to the small size and high mobility of lithium ions, small voltages produce an exceptionally high magnetoelectric coupling efficiency. The magnetic switching effect is attributed to the modulation of spin-orbit coupling at the Co-Pt interface when lithium ions migrate between a lithium storage layer and the magnetic interface across a solid-state electrolyte.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Chunjie Yan, Lina Chen, Kaiyuan Zhou, Liupeng Yang, Qingwei Fu, Wenqiang Wang, Wen-Cheng Yue, Like Liang, Zui Tao, Jun Du, Yong-Lei Wang, Ronghua Liu
Summary: We systematically investigated the influence of Ni and Co thickness on the properties of multilayer films and found the relationship between PMA coefficient, magnetic domain structures, and magnetization dynamics. The results of this study are of great significance for promoting the application of PMA [Co/Ni] multilayer films in spintronic and spin-orbitronic devices.
Article
Physics, Condensed Matter
Qiuyue Li, Yawen Song, Fangzhou Wang, Meihong Liu, Xiaoqi Ma, Xinfang Guo, Xiaowen Chen, Jing Yu, Shuai Du, Hao Li, Jie Xu, Shandong Li, Derang Cao
Summary: This study investigated the magnetization dynamics of a 350 nm permalloy film and found that the change in magnetic domain structure from in plane domain to labyrinth domain was due to an increase in the film's perpendicular magnetic anisotropy. The magnetization dynamics revealed that the resonant modes of the film strongly depended on the magnetic domain structure.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Joonghoe Dho, Jungbae Kim
Summary: A 65-nm thick (001) NiCo2O4 film with metallic and ferrimagnetic properties at room temperature was found to have a relatively stable magnetic domain structure. The variation in magnetic domains was mainly caused by domain rotation behavior.
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
Materials Science, Multidisciplinary
Tatsuya Yamamoto, Takayuki Nozaki, Kay Yakushiji, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Summary: The study shows that Ta layer in MgO/Ta/CoFeB/MgO junctions can enhance the PMA of magnetic films and eliminate the diffusion of Ta, leading to superior thermal stability and the release of VCMA effect. In addition, the Co-Fe compositional variation in CoFeB layer associated with Ta insertion is related to the changes in PMA and VCMA.
Article
Materials Science, Multidisciplinary
Hyeon-Kyu Park, Sang-Koog Kim
Summary: The study theoretically explored the ultrafast propagations of spin waves in antiferromagnetic Bloch-type domain walls and found that the dispersive relation of these spin waves shows extremely high group velocity without any forbidden gap. The results offer guidance for the development of ultrafast information signal processing in nanoscale magnonic circuits composed of antiferromagnetic domain walls.
Article
Materials Science, Multidisciplinary
Cai Zhou, Dengyu Zhu, Dong Li, Fufu Liu, Wei Zhu, Kang Du, Mingyao Xu, Jiaxing Fang, Dequan Meng, Chuangwen Wu, Shiheng Liang, Shengxiang Wang
Summary: The magnetic domain of a Co/Pt thin film grown on a PMN-PT substrate was controlled by an electric field at room temperature. The magnetic hysteresis loops and magnetic domain state were recorded using MOKE. In the unpoled state, magnetic domain wall propagation was observed under a fixed perpendicular magnetic field. The electric-field control of the magnetic domain was demonstrated by exploiting piezostrain-mediated magnetoelectric coupling in ferromagnetic/ferroelectric heterostructures with perpendicular magnetic anisotropy, which is promising for designing future spin-transfer torque magnetoresistive random access memory devices.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Physics, Applied
J. D. Miller, H. J. Trodahl, M. Al Khalfioui, S. Vezian, B. J. Ruck
Summary: A unique bulk-origin perpendicular magnetic anisotropy (PMA) was found in thin films of the cubic ferromagnetic semiconductor GdxSm1-xN. The films exhibited out-of-plane remanence reaching 80% of the saturation magnetization in films with up to 30% Gd, as indicated by in-vs-out-of-plane magnetic hysteresis. Anomalous Hall effect data showed that the conduction-band spin imbalance retained 100% remanence, maintaining half-metallic conduction even when the out-of-plane applied field was reduced to zero, in contrast to the 80% magnetization remanence. The occurrence of PMA in this cubic material was discussed as stabilized by a mixture of two in-plane crystal orientations in the epitaxial (111)-oriented films.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Analytical
Anmol Mahendra, Peter P. Murmu, Susant Kumar Acharya, Atif Islam, Holger Fiedler, Prasanth Gupta, Simon Granville, John Kennedy
Summary: In this study, the perpendicular magnetic anisotropy (PMA) of Co2MnGa Heusler alloy film was tuned by argon ion irradiation. The results showed that ion irradiation reduced the effective anisotropy energy and PMA of the film, which is beneficial for magnetic sensor applications.
Article
Nanoscience & Nanotechnology
Qi Liu, Pengfei Liu, Xiaowen Li, Sixia Hu, Yuanmin Zhu, Cai Jin, Wenqiao Han, Yanjiang Ji, Zedong Xu, Songbai Hu, Mao Ye, Lang Chen
Summary: By designing and fabricating manganite-based magnetic tunnel junctions, we achieved perpendicular tunneling and observed spin-dependent tunneling behavior. The dominant role of direct tunneling was observed in the low bias region, while it was associated with thermionic emission in the high bias region.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Young Chan Won, Jae-Pyoung Ahn, Sang Ho Lim
Summary: This study investigated the perpendicular magnetic anisotropy (PMA) and microstructure of Pt/Co/AlN stacks. It was found that the magnetic moment significantly increased after annealing, leading to strong PMA. The effective PMA energy densities were 2.28 and 1.96 x 10(7) erg/cm(3) after annealing at 300 and 400 degrees C, respectively. High-resolution cross-sectional transmission electron microscopy confirmed the presence of strong PMA.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Lukasz Frackowiak, Feliks Stobiecki, Maciej Urbaniak, Michal Matczak, Gabriel David Chaves-O Flynn, Mikolaj Bilski, Andreas Glenz, Piotr Kuswik
Summary: In this study, alloy films with well-controlled concentration gradients were deposited using co-sputtering and compared with numerical calculations. The compensation concentration for Co-Tb films was found to shift towards higher Tb content with decreasing thickness. Similar trends were observed for both Co-Tb alloy films and (Tb/Co)RN multilayers, with the compensation concentration decreasing as total film thickness increased.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Blazej Anastaziak, Hubert Glowinski, Maciej Urbaniak, Lukasz Frackowiak, Feliks Stobiecki, Piotr Kuswik
Summary: In this study, the oxidation of Co/Ni bilayers was investigated to find that oxidation time can tune the magnetic properties, leading to an increase in PMA contribution, attributed to exchange bias coupling between the ferromagnetic and antiferromagnetic layers.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
A. K. Dhiman, R. Gieniusz, P. Gruszecki, J. Kisielewski, M. Matczak, Z. Kurant, I. Sveklo, U. Guzowska, M. Tekielak, F. Stobiecki, A. Maziewski
Summary: This study investigates the magnetic field-driven evolution of domain structures and magnetization hysteresis loops in (Ir/Co/Pt)(6) magnetic multilayers with interfacial Dzyaloshinskii-Moriya interaction (IDMI) using various experimental techniques. By quantitatively evaluating IDMI using Brillouin light scattering (BLS) spectroscopy, the influence of IDMI on the modulation of domains and magnetic field is revealed, providing a deeper understanding of the characteristics of the magnetic multilayers.
Article
Chemistry, Multidisciplinary
Kseniia Volkova, Julia Heupel, Sergei Trofimov, Fridtjof Betz, Remi Colom, Rowan W. MacQueen, Sapida Akhundzada, Meike Reginka, Arno Ehresmann, Johann Peter Reithmaier, Sven Burger, Cyril Popov, Boris Naydenov
Summary: In this study, diamond nano-pillars were fabricated using electron beam lithography and reactive ion etching, and NV centers were successfully created. The lifetime of NV centers in the nano-pillars was found to be shorter, possibly due to the coupling between NV centers and interaction with other defects.
Article
Engineering, Electrical & Electronic
Sapida Akhundzada, Xiaohui Yang, Johannes Fiedler, Eireen Kakel, Basim Al-Qargholi, Stefan Buhmann, Arno Ehresmann, Hartmut Hillmer
Summary: The paper presents a design and fabrication process for micron-sized electromechanical system (MEMS) elements with asymmetric hollow cylinders. By adapting the process steps, these elements can be connected to form asymmetric cylinders or remain separate to form curled cylindrical or ellipsoidal tubes.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2022)
Article
Multidisciplinary Sciences
Blazej Anastaziak, Weronika Andrzejewska, Marek Schmidt, Michal Matczak, Ivan Soldatov, Rudolf Schaefer, Mikolaj Lewandowski, Feliks Stobiecki, Christian Janzen, Arno Ehresmann, Piotr Kuswik
Summary: We studied the structural, chemical, and magnetic properties of Ti/Au/Co/Ni layered systems subjected to plasma oxidation. The process leads to the formation of NiO and does not affect the surface roughness and grain size of the Co/Ni bilayers. By using plasma oxidation, we were able to create 2D heterostructures with different magnetic properties.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Atomic, Molecular & Chemical
Boris M. Lagutin, Ivan D. Petrov, Victor L. Sukhorukov, Victor A. Kilin, Nikolay M. Novikovskiy, Philipp V. Demekhin, Arno Ehresmann
Summary: Sequential two-photon ionization is a experimentally accessible process, where new free-electron laser sources are used for excitation. The photoelectron spectrum (PES) of the second step of sequential two-photon double ionization (2PDI(II)) at a photon excitation energy of 65.3 eV was studied theoretically, with a focus on the consequences of electron correlations in this process.
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
Materials Science, Multidisciplinary
Sreedevi Janardhanan, Slawomir Mielcarek, Piotr Kuswik, Maciej Krawczyk, Aleksandra Trzaskowska
Summary: This study investigated the spin-wave and surface acoustic wave dynamics in a multilayer structure using Brillouin light scattering. The quantitative analysis and finite element method simulations were used to determine the system parameters.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(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
M. Kowacz, M. Matczak, M. Schmidt, F. Stobiecki, P. Kuswik
Summary: Interfaces in thin-film systems have a significant impact on magnetic properties. By controlling the ion energy, the modification efficiency of interfaces can be controlled, thereby tuning the perpendicular magnetic anisotropy of the system.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Optics
Xaver Holzapfel, Tsveta Miteva, Nicolas Sisourat, Alexander Schrodt, Lutz Marder, Dana Bloss, Christian Ozga, Catmarna Kuestner-Wetekam, Arno Ehresmann, Andre Knie, Andreas Hans
Summary: In this study, a systematic investigation of an RCT photon spectrum in clusters is presented, revealing that Ne dimer ions may form prior to RCT and different features dominate the photon spectrum. Additionally, it is found that the lifetime of the radiative decay is sensitive to the cluster stoichiometry.
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.
