Article
Multidisciplinary Sciences
Mengxi Wang, Jun Zhou, Xiaoguang Xu, Tanzhao Zhang, Zhiqiang Zhu, Zhixian Guo, Yibo Deng, Ming Yang, Kangkang Meng, Bin He, Jialiang Li, Guoqiang Yu, Tao Zhu, Ang Li, Xiaodong Han, Yong Jiang
Summary: In this study, an antiferromagnetic insulator-based heterostructure, NiO/Ta/Pt/Co/Pt, is proposed for spin polarization control. Zero-field magnetization switching can be achieved through modulation of the out-of-plane component of spin polarization at the NiO/Pt interface. The switching ratio can be effectively tuned by the substrates, offering a promising platform for energy-efficient spintronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
A. A. Voronov, D. O. Ignatyeva, A. K. Zvezdin, T. B. Shapaeva, V. Belotelov
Summary: In this study, an approach to optically excite nonuniform THz spin dynamics and probe its spatial distribution inside a magnetic crystal is described. By illuminating the crystal with properly adjusted polarization laser pulses, the strong optical birefringence inherent in the crystal is utilized to create unusual behavior of the effective magnetic field. The study is demonstrated using a yttrium orthoferrite crystal as an example, but the proposed approach is applicable to various magnetic materials with optical anisotropy.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Physical
Amal Aldarawsheh, Moritz Sallermann, Muayad Abusaa, Samir Lounis
Summary: Topological antiferromagnetism is a vibrant research field aiming to identify topologically protected magnetic states. This study predicts new chiral particles, exchange-frustrated multimeronic spin textures, hosted by a Ne'el magnetic state in single AFM materials. These structures have distinct topological charges and enhanced stability against external magnetic fields.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Na Li, Jin Tang, Lei Su, Ya-Jiao Ke, Wei Zhang, Zong-Kai Xie, Rui Sun, Xiang-Qun Zhang, Wei He, Zhao-Hua Cheng
Summary: The study investigates the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure using an all-optical method. It demonstrates that optical modification of interfacial exchange coupling between Fe and GdFeO3 efficiently excites terahertz spin dynamics, and the excitation efficiency can be significantly modified via the pump laser influence.
Article
Physics, Applied
Julius de Rojas, Del Atkinson, Adekunle O. Adeyeye
Summary: We have investigated the static and dynamic behavior of pseudo-3D trilayer square artificial spin ice structures. By varying the thickness of the nonmagnetic copper layer, interlayer coupling between layers can be finely controlled, leading to bespoke magnetization states and resonance spectra tuning. This study provides a programmable degree of freedom for magnetization dynamics in magnonic and microwave devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Shutaro Karube, Takahiro Tanaka, Daichi Sugawara, Naohiro Kadoguchi, Makoto Kohda, Junsaku Nitta
Summary: The study investigates the generation of spin-splitter torque in collinear antiferromagnetic RuO2, revealing different spin current polarizations on various crystal planes. By utilizing this spin-splitter torque, field-free switching of ferromagnetic materials can be achieved, contributing to the development of antiferromagnetic spin-orbitronics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Tetsuo Endoh
Summary: The study demonstrates that Pt/Ir/Pt and Pt/Ir multilayers can be used as nonmagnetic spacer layers to achieve antiferromagnetic interlayer exchange coupling and generation of large spin-orbit torque in synthetic antiferromagnetic coupling layers.
Article
Materials Science, Multidisciplinary
Birui Wu, Menghao Jin, Ziji Shao, Haodong Fan, Jiahong Wen, Hai Li, Changqiu Yu, Bo Liu, Tiejun Zhou
Summary: This study investigates current-induced magnetization switching and dampinglike field in Pt/Co/PtMn trilayer films with a wedged ultrathin antiferromagnetic (AFM) PtMn layer. By breaking the symmetry with the effective shape anisotropy in the wedged AFM PtMn layer, field-free SOT switching is observed. The study finds that the dampinglike field is boosted by up to 30% through wedging the AFM PtMn layer, and the canting of spins caused by the wedge shape accounts for the observed field-free switching and enhancement of SOT efficiency.
Article
Materials Science, Multidisciplinary
Yoshiaki Saito, Shoji Ikeda, Nobuki Tezuka, Hirofumi Inoue, Tetsuo Endoh
Summary: Deterministic switching of perpendicularly magnetized systems using spin-orbit torque without the need for an in-plane auxiliary magnetic field is achieved by introducing an interfacial Dzyaloshinskii-Moriya interaction into synthetic antiferromagnetic systems. The best performance is observed in the synthetic antiferromagnetic system with an Ir22Mn78 capping layer, which shows a dampinglike spin-orbit torque efficiency of 28.1%. These findings suggest that the synthetic antiferromagnetic system is a promising building block for future nonvolatile high-speed memories and logic circuits utilizing the spin Hall effect.
Article
Materials Science, Multidisciplinary
R. Arun, R. Gopal, V. K. Chandrasekar, M. Lakshmanan
Summary: The study demonstrates the potential for high-frequency oscillations in a spin-torque oscillator by numerically solving the LLGS equation with in-plane magnetized layers. The oscillation frequency can be significantly tuned by adjusting the direction of the in-plane magnetic field, reaching frequencies as high as 65 GHz. Furthermore, the microwave frequency can be adjusted by varying the direct current magnitude, in-plane field angle, or strength of the in-plane magnetic field. Power enhancement is observed with changes in the in-plane field angle and current.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Bowen Ma, Gregory A. Fiete
Summary: This study theoretically investigates magnon-phonon hybrid excitations in two-dimensional antiferromagnets, and discovers nontrivial Berry curvature around the anticrossing rings among magnons and both optical and acoustic phonon bands, resulting in a possible observation of valley Hall effect.
Article
Multidisciplinary Sciences
Fen Xue, Shy-Jay Lin, Mingyuan Song, William Hwang, Christoph Klewe, Chien-Min Lee, Emrah Turgut, Padraic Shafer, Arturas Vailionis, Yen-Lin Huang, Wilman Tsai, Xinyu Bao, Shan X. X. Wang
Summary: Xue et al. investigate 'type-x' spin-orbit torque switching in Platinum/Cobalt multilayers, demonstrating unique spin polarizations and field-free magnetization switching. The unconventional spin currents result from the strong orbital magnetic moment observed in the low-dimensional Co films. Their work provides additional pathways for electrical control of spintronic devices in pursuit of high-speed, high-density, and low-energy non-volatile memory.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Xue Liang, Jing Xia, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Xiaoxi Liu, Lei Qiu, Guoping Zhao, Yan Zhou
Summary: The research team investigated the dynamics of skyrmions in antiferromagnets and found a way to control them using driving current and voltage-controlled magnetic anisotropy gradient. They also proposed a design of logic computing gates based on skyrmion manipulation, which successfully performed basic Boolean operations.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
E. Z. Zhang, Y. C. Deng, X. H. Liu, X. Z. Zhan, T. Zhu, K. Y. Wang
Summary: The study shows that the antiferromagnetic interfacial states can be effectively manipulated through SOT when the thickness of Ir-Mn or Co exceeds 4nm, leading to gradual switching of spins; additionally, in the Pt/Co/Ru/Ir-Mn system, the exchange coupling between Co and Ir-Mn can be influenced by the thickness of the Ru layer.
Article
Chemistry, Multidisciplinary
Xiao-Xiao Zhang, Shengwei Jiang, Jinhwan Lee, Changgu Lee, Kin Fai Mak, Jie Shan
Summary: Research on two-dimensional magnetic materials has attracted significant interest due to their unique properties at the few-layer limit, which could have important implications for the development of 2D devices. Studying the magnetization dynamics in atomically thin layers of antiferromagnetic FePS3 revealed changes in the dynamics with decreasing thickness, which could be crucial for future device design.
Article
Materials Science, Multidisciplinary
U. Urdiroz, A. Gomez, M. Magaz, D. Granados, M. Sanchez Agudo, J. Rubio-Zuazo, G. R. Castro, C. Stan, N. Tamura, H. A. Padmore, C. Mueller, J. McCord, F. Cebollada, F. J. Palomares, J. M. Gonzalez
Summary: The study reports on inducing local anisotropy modifications in amorphous Fe80B20 stripes through X-ray irradiation, leading to the stable localization of a 180 degrees domain wall and the excitation of spatially inhomogeneous ferromagnetic resonances nearby the irradiated region. The time dependencies of the magnetization precession show a uniform phase shift of 180 degrees over distances of approximately 20 μm from the stabilized domain wall.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Applied
F. Klingbeil, S. D. Stoelting, J. McCord
Summary: Temperature measurements are essential in laboratory and industry settings. The study demonstrates the use of magnetooptical active iron garnet films to relate magnetic and micromagnetic features to temperature sensing. The accuracy of perceiving temperatures below 0.1 degrees C is achieved through analyzing the susceptibility changes in magnetic domain walls and magnetooptical signal amplitude.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Raffael Herzer, Annett Gebert, Ute Hempel, Franziska Hebenstreit, Steffen Oswald, Christine Damm, Oliver G. Schmidt, Mariana Medina-Sanchez
Summary: This study fabricated transparent tubular microscaffolds to mimic the typical pores of structural implants for investigating early bone formation and cell-material interactions at the single cell level. A β-stabilized alloy Ti-45Nb was chosen for fabrication due to its elastic modulus similar to natural bone. Human mesenchymal stem cell migration, adhesion, and osteogenic differentiation were studied with a focus on CaP formation and cell-body crystallization, analyzed using optical and electron microscopy.
Article
Chemistry, Multidisciplinary
Paul Wrede, Mariana Medina-Sanchez, Vladimir M. Fomin, Oliver G. Schmidt
Summary: This study explores the impact of different propulsion mechanisms on the motion of chemical micromotors, identifying the combined effects of medium viscosity, surface tension, and fuel concentration on the swimming ability of the micromotors, and pinpointing the dominant propulsion mechanisms for describing their motion more accurately.
Article
Materials Science, Multidisciplinary
M. Jovicevic-Klug, P. Jovicevic-Klug, J. McCord, B. Podgornik
Summary: This study demonstrates the potential of using MOKE microscopy to analyze the microstructure and stress state of martensitic steels, without the need for chemical etching, and even achieving accurate volumetric fraction estimation of retained austenite. By combining MOKE microscopy with other techniques, the residual stress state of steel can be accurately determined, and significant reduction in residual stresses can be achieved through deep cryogenic treatment, providing valuable insights for steel properties research.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Fasheng Qiu, Matic Jovicevic-Klug, Guiyun Tian, Guanhua Wu, Jeffrey McCord
Summary: This study investigates magnetic field and stress-induced magnetic domain reorientation and its correlation with Magnetic Barkhausen Noise (MBN) using time-resolved magneto-optical imaging of grain-oriented electrical steels. The results show that transitions between magnetic domain states directly influence the MBN signal, with 180 degrees domain wall (DW) reorganization and DW-type conversion generating peaks in the MBN measurement for longitudinal and transverse electrical steel. The complex domain arrangement processes in transverse electrical steel are revealed through magnetic domain imaging, providing insight into bulk micromagnetic phenomena.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Yuye Wang, Shuwen Zeng, Aurelian Crunteanu, Zhenming Xie, Georges Humbert, Libo Ma, Yuanyuan Wei, Aude Brunel, Barbara Bessette, Jean-Christophe Orlianges, Fabrice Lalloue, Oliver G. Schmidt, Nanfang Yu, Ho-Pui Ho
Summary: An enhanced plasmonic biosensor was developed in this study to detect small cancer biomarkers with low molecular weight and low concentration range. By precisely engineering atomically thin materials, a phase singularity and significant lateral position shift effect were achieved, enabling the detection of TNF-alpha cancer marker at the femtomolar level.
NANO-MICRO LETTERS
(2021)
Review
Materials Science, Multidisciplinary
Yongpeng Chen, Yin Yin, Libo Ma, Oliver G. Schmidt
Summary: Optoplasmonic whispering-gallery-mode (WGM) microcavities combine plasmonic nanostructures and optical microcavities to support hybrid modes with subwavelength mode confinement and high-quality factor. The report reviews geometric designs, fabrication strategies, and three types of hybrid modes in optoplasmonic microcavities, as well as discusses the coupling effect between localized surface plasmon resonances and whispering-gallery modes. Applications in enhanced sensing, nanolasing, and free-space coupling are highlighted, with an outlook on opportunities and challenges in developing large-scale on-chip integrated optoplasmonic systems.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Cai Mueller, Phillip Durdaut, Rasmus B. Hollaender, Anne Kittmann, Viktor Schell, Dirk Meyners, Michael Hoeft, Eckhard Quandt, Jeffrey McCord
Summary: This study revealed the complex behavior of horizontally polarized surface shear waves in magnetoelectric surface acoustic wave based magnetic field sensor devices using time-resolved magnetooptical microscopy, uncovering partial surface wave reflections, wave front dephasing, and secondary wave generation originating from structures and magnetic domain walls.
ADVANCED ELECTRONIC MATERIALS
(2022)
Review
Physics, Applied
Alexey Kimel, Anatoly Zvezdin, Sangeeta Sharma, Samuel Shallcross, Nuno de Sousa, Antonio Garcia-Martin, Georgeta Salvan, Jaroslav Hamrle, Ondrej Stejskal, Jeffrey McCord, Silvia Tacchi, Giovanni Carlotti, Pietro Gambardella, Gian Salis, Markus Muenzenberg, Martin Schultze, Vasily Temnov, Igor Bychkov, Leonid N. Kotov, Nicolo Maccaferri, Daria Ignatyeva, Vladimir Belotelov, Claire Donnelly, Aurelio Hierro Rodriguez, Iwao Matsuda, Thierry Ruchon, Mauro Fanciulli, Maurizio Sacchi, Chunhui Rita Du, Hailong Wang, N. Peter Armitage, Mathias Schubert, Vanya Darakchieva, Bilu Liu, Ziyang Huang, Baofu Ding, Andreas Berger, Paolo Vavassori
Summary: This article provides a comprehensive overview of recent developments, advances, and emerging research directions in the field of magneto-optics. It covers various applications of magneto-optical effects in different materials and spectral ranges. It serves as an important reference for emerging research directions in modern magneto-optics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Finn-Frederik Stiewe, Tristan Winkel, Tobias Kleinke, Tobias Tubandt, Hauke Heyen, Lucas Vollroth, Ulrike Martens, Cai Mueller, Jeffrey McCord, Jakob Walowski, Markus Muenzenberg
Summary: In this study, we use THz radiation to determine the alignment of magnetic domains in a CoFeB layer. By generating THz pulses using fs laser pulses in magnetized CoFeB/Pt heterostructures based on spin currents, and detecting the radiation phase-sensitively using an LT-GaAs Auston switch, we are able to determine the magnetization alignment. Our scanning technique with motorized stages allows us to image two dimensional magnetic structures, and by using near-field imaging, we can enhance the spatial resolution. We prepare spintronic emitters of diverse geometric shapes and sizes to observe the formation of magnetization patterns, and demonstrate the influence of external magnetic fields on the alignment of emitted THz radiation. The combination of this method with THz range spectroscopic information makes it interesting for wider applications in probing high-resolution THz excitation in spin systems.
Article
Materials Science, Multidisciplinary
P. Jovicevic-Klug, M. Jovicevic-Klug, L. Tegg, D. Seidler, L. Thormaehken, R. Parmar, M. Amati, L. Gregoratti, J. M. Cairney, J. McCord, M. Rohwerder, B. Podgornik
Summary: This study investigates the effect of deep cryogenic treatment on a high-alloyed ferrous alloy to understand the resulting changes in microstructure and properties. The increased solute mobility and carbide nucleation with deep cryogenic treatment lead to modified chemical and microstructural homogeneity, ultimately impacting the surface properties and applicability of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Analytical
Julius Schmalz, Elizaveta Spetzler, Jeffrey McCord, Martina Gerken
Summary: In this study, magnetoelectric cantilevers consisting of strain-coupled magnetostrictive and piezoelectric layers are investigated for magnetic field measurements. The cantilevers are electrically excited and operated in a special mechanical mode, with resonance frequencies above 500 kHz, exhibiting high-quality factors and a promising limit of detection. Strategies for eliminating external effects and design guidelines to minimize unwanted oscillations are proposed.
Article
Materials Science, Multidisciplinary
Findan Block, Finn Klingbeil, Umer Sajjad, Christine Arndt, Sandra Sindt, Dennis Seidler, Lars Thormaehlen, Christine Selhuber-Unkel, Jeffrey McCord
Summary: Controlled transport of cells in biomedical applications can be achieved by designing soft magnetic elements to form a transport network using computational methods. This enables precise cell location and manipulation on surfaces using rotational magnetic fields. The networks allow for variable movement patterns of magnetic carriers and cells and can be integrated with CMOS-compatible materials.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Physics, Applied
G. Masciocchi, M. Fattouhi, E. Spetzler, M. -A Syskaki, R. Lehndorff, E. Martinez, J. McCord, L. Lopez-Diaz, A. Kehlberger, M. Klaeui
Summary: In this work, the authors propose a CMOS-compatible and inexpensive method for applying local strain on a Si/SiOx substrate. They demonstrate how the magnetoelastic energy landscape created by a pair of openings can be used to create pinning sites in a magnetic nanowire, leading to changes in the local magnetic anisotropy. The experimental results are supported by simulations and calculations, and the authors discuss the potential applications of this technology.
APPLIED PHYSICS LETTERS
(2023)
