Article
Physics, Applied
Guiomar D. Soria, Cecilia Granados-Miralles, Anna Mandziak, Petra Jenus, Matilde Saura-Muzquiz, Mogens Christensen, Michael Foerster, Lucia Aballe, Jose F. Fernandez, Juan de la Figuera, Adrian Quesada
Summary: Composites of magnetically hard and soft phases play crucial roles in various applications, with the magnetic coupling between these phases influencing the macroscopic properties of the materials. Studies on a hard/soft bilayer system show significant differences in magnetization direction and magnetic domain patterns between the hard magnetic oxide and soft metallic overlayer. The results suggest that low degrees of exchange-coupling can prevent substantial softening of the composite and lead to the alignment of soft and hard magnetic moments.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Anna Mandziak, Miguel A. Aristu, Jose Emilio Prieto, Michael Foerster, Lucia Aballe, Juan de la Figuera
Summary: We investigated the response of magnetic domains in thin magnetite microstructures to weak external magnetic fields. The magnetic domains were observed using x-ray magnetic circular dichroism in photoemission electron microscopy, while applying external magnetic fields in different directions. The displacements of the Landau state vortex core under the applied magnetic field were quantified and compared with micromagnetic simulations. The results demonstrate the bulk-like magnetic properties of the nanometer-thick microstructures and their potential for technological applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Microscopy
Anna Mandziak, Juan de la Figuera, Adrian Quesada, Alba Berja, Cecilia Granados-Miralles, Jose Emilio Prieto, Lucia Aballe, Michael Foerster, Miguel Angel Nino, Pawel Nita
Summary: We conducted a spatially resolved X-ray magnetic linear dichroism study on high quality micron-sized mixed nickel-cobalt oxide (NCO) crystals. NixCo1-xO was prepared in-situ by high-temperature oxygen-assisted molecular beam epitaxy on a Ru(0001) single crystal substrate. Three different compositions were prepared to examine the effect of incorporating Ni into the cobalt oxide films. The element-specific XMLD measurements showed strong antiferromagnetic contrast at room temperature, with magnetic domains up to one micron size, indicating the high structural quality of the NCO islands.
Article
Materials Science, Multidisciplinary
P. J. Newton, N. B. Devlin, S. M. Masur, M. Ghidini, D. Backes, F. Maccherozzi, A. A. Pacheco-Pumaleque, M. A. Gonzalez Esqueche, C. H. W. Barnes
Summary: The magnetisation configuration on wide strips is found to be perpendicular to the majority magnetisation direction. as the strip width decreases, the change in domain structure and magnetisation reversal characteristics depend on the relative magnetisation configurations of neighboring strips, which vary stochastically upon the application and removal of a magnetic field. Canted field is necessary to ensure sharp, consistent magnetisation reversal when writing a binary code.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
K. Ait Oukaci, D. Stoeffler, M. Hehn, M. Grassi, B. Sarpi, M. Bailleul, Y. Henry, S. Petit, F. Montaigne, R. Belkhou, D. Lacour
Summary: By combining volume sensitive high resolution Magnetic Force Microscopy with surface sensitive X-ray Photoemission Electron Microscopy, the depth profile of a weak stripe magnetic texture and its evolution upon in-plane magnetization reversal were resolved. It was shown that the conventional weak stripe texture undergoes a well-defined undulation while the magnetic field is reversed to negative after in plane positive saturation. This reversal mode is characterized by a checker board pattern of alternating surface magnetic charges and by a longitudinal modulation of the in-plane component of magnetization.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Y. M. Xie, C. C. Wang
Summary: The memory effect of magnetoelectric coupling is observed in Co4Ta2O9, and it can be manipulated by adjusting the applied magnetic field and polarization process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Chao Lei, Bheema L. Chittari, Kentaro Nomura, Nepal Banerjee, Jeil Jung, Allan H. MacDonald
Summary: The study predicts that layer antiferromagnetic bilayers from van der Waals materials exhibit a strong magnetoelectric response, which can be controlled electrically for applications.
Article
Instruments & Instrumentation
Michael Guevara De Jesus, Zhuyun Xiao, Maite Goiriena-Goikoetxea, Rajesh Chopdekar, Mohanchandra K. Panduranga, Paymon Shirazi, Adrian Acosta, Jane P. Chang, Jeffrey Bokor, Gregory P. Carman, Rob N. Candler, Christopher Lynch
Summary: This work demonstrates the design of magnetoelectric composite heterostructures at a small scale and the ability to switch them from a magnetized state to a vortex state using electric field induced strain. Experimental and simulation results provide insight into the behavior and performance of these heterostructures.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
S. W. Lovesey
Summary: The Landau free energy of compounds with a linear magnetoelectric (ME) effect includes a product of an electric field and a magnetic field. This effect is characterized by the invariance of the coefficient of the product of fields under anti-inversion symmetry operation. This symmetry is present in 58 of 122 magnetic crystal classes and prohibits nonlinear contributions to the free energy in 19 of these classes. By studying iron tellurate and a spin ladder compound, Dirac monopoles are identified in their bulk magnetic properties, with differences in their diffraction patterns due to symmetry restrictions.
Article
Chemistry, Multidisciplinary
Anna Dmitriyeva, Vitalii Mikheev, Sergei Zarubin, Anastasia Chouprik, Giovanni Vinai, Vincent Polewczyk, Piero Torelli, Yury Matveyev, Christoph Schlueter, Igor Karateev, Qiong Yang, Zhaojin Chen, Lingling Tao, Evgeny Y. Tsymbal, Andrei Zenkevich
Summary: Composite multiferroics with ferroelectric and ferromagnetic components have larger magnetoelectric coupling compared to single-phase materials. Experimental evidence of charge-mediated magnetoelectric coupling at the Ni/Hf0.5Zr0.5O2 interface has been reported, showing the effect of ferroelectric polarization on the magnetic response of a nanometer-thick Ni layer. The results suggest promise in designing multifunctional devices compatible with modern semiconductor technology using ferroelectric HfO2-based composite multiferroics.
Article
Materials Science, Multidisciplinary
F. K. Olsen, A. D. Bang, E. Digernes, S. D. Sloetjes, A. Scholl, R. Chopdekar, T. Tybell, J. K. Grepstad, E. Folven
Summary: This study investigates the effects of nanoscale patterning on ferromagnetic properties and film crystalline structure of epitaxial thin films of La0.7Sr0.3MnO3. Two different techniques are used to pattern the thin films, resulting in stronger magnetic dichroism signal along the edges of the embedded magnets near T-C and a reduction of in-plane lattice parameters. The discussion focuses on how in-plane stress from the nanomagnet surroundings affects the magnetic properties in these structures.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Multidisciplinary Sciences
Min Gyu Kim, Andi Barbour, Wen Hu, Stuart B. Wilkins, Ian K. Robinson, Mark P. M. Dean, Junjie Yang, Choongjae Won, Sang-Wook Cheong, Claudio Mazzoli, Valery Kiryukhin
Summary: Magnetic domains in antiferromagnetic materials are crucial for understanding magnetism and its applications. In this study, videos of fluctuating antiferromagnetic domains in Ni2MnTeO6 were obtained using coherent x-ray diffraction. The findings highlight the potential significance of dynamic domain imaging in phase transition studies and magnetic device research.
Article
Materials Science, Multidisciplinary
Kunihiro Yananose, Paolo G. Radaelli, Mario Cuoco, Jaejun Yu, Alessandro Stroppa
Summary: This study reveals the unique physical phenomena of twisted homo-bilayers of collinear antiferromagnetic CrI3. The twisting activates the pyroelectricity and the magneto-optical Kerr effect, which can be controlled by the twist angle to manipulate the electric polarization and Kerr angle.
Article
Chemistry, Physical
Tongshuai Zhu, Huaiqiang Wang, Haijun Zhang, Dingyu Xing
Summary: The study explored MnBi2Te4 films with spontaneously broken P and S symmetries, showing significantly enhanced dynamical magnetoelectric effects. This suggests that thin films of MnBi2Te4 and related compounds could serve as a promising material platform for experimental studies of axion electrodynamics.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Physics, Applied
Ryo Nakamura, Shunya Saegusa, Naoya Akamatsu, Keisuke Yamada, Takeshi Ogasawara, Masaki Oura, Takuo Ohkochi, Akinobu Yamaguchi
Summary: The modulation of magnetic domain structure in Ni wires deposited on a LiNbO3 substrate was observed under the influence of DC current or heating. A striped domain structure perpendicular to the X-axis of the LiNbO3 substrate is formed due to the competition between magnetic shape anisotropy and uniaxial magnetic anisotropy from the heterojunction. This striped domain structure disappears with an increase in DC current or substrate heating, likely due to a decrease in uniaxial magnetic anisotropy and magnetization resulting from an oxidation reaction at the interface. Heterojunctions are found to be crucial in controlling and modulating the magnetic properties of this system.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Bei Liu, Jin Peng, Hai-Ning Wang, Chang-Feng Fang, Jun-Lei Wang, Xian Zhao, Lu Deng
Summary: We present a dual-beam high-sensitivity atomic magnetometer (AM) that operates at room temperature and has a large dynamic range. By using a nonlinear magneto-optical rotation (NMOR) enhancing scheme with an inelastic wave-mixing laser, we achieve significant signal enhancement compared to a single-beam scheme. The dual-beam scheme performs well at lower laser intensities and off-resonance detuning, delivering a sensitivity of 20 fT/Hz(1/2) and a bandwidth of 2 kHz, surpassing traditional spin-exchange relaxation-free AMs. This opens up possibilities for the development of low-power and cost-effective miniaturized AMs for various applications.
APPLIED PHYSICS EXPRESS
(2023)
Article
Chemistry, Physical
Jiezhao Lv, Yongjian Ding, Peng Sun, Junlei Wang, Tingwei Chen, Xian Zhao, Changfeng Fang, Lili Wang
Summary: We performed quantum chemical calculations using time-dependent density functional theory on two types of N-alkyl imine-based light-driven rotary motors. A new transition structure was discovered during thermal isomerization. Based on this, we proposed a '3-step' rotation process and revealed the complete working mechanism in the ground state. Additionally, we theoretically confirmed the robustness of the motors by substituting pendant groups on the rotator in the fjord region. The results showed that the free-energy barriers of the rate-limiting thermal steps can maintain their robustness, making these motors more promising for potential molecular-level machine fabrication.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Physics, Condensed Matter
Simeon J. Gilbert, Mingxing Li, Jia-Shiang Chen, Hemian Yi, Alexey Lipatov, Jose Avila, Alexander Sinitskii, Maria C. Asensio, Peter A. Dowben, Andrew J. Yost
Summary: The presence of in-plane chiral effects and spin-orbit coupling in a TiS3(001) field-effect phototransistor is confirmed through changes in the photocurrent caused by left versus right circularly polarized light. NanoARPES measurements indicate that the direction of the photocurrent is protected by strong spin-orbit coupling and the anisotropy of the band structure. Dark electronic transport measurements show that TiS3 is n-type with an electron mobility ranging from 1-6 cm(2)V(-1)s(-1). I-V measurements under laser illumination demonstrate that the photocurrent exhibits bias directionality dependence similar to bipolar spin diode behavior. The presence of spin-orbit coupling in TiS3, a material without heavy elements, is attributed to the loss of inversion symmetry at the TiS3(001) surface.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Multidisciplinary Sciences
Qing-Song Liu, Han-Wen An, Xu-Feng Wang, Fan-Peng Kong, Ye-Cai Sun, Yu-Xin Gong, Shuai-Feng Lou, Yi-Fan Shi, Nan Sun, Biao Deng, Jian Wang, Jia-Jun Wang
Summary: A tortuosity-gradient thick electrode was developed to promote fast ion transport and mitigate the heterogeneous solid-state reaction, leading to excellent electrochemical performance for solid-state batteries.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Physical
Jijian Xu, Travis P. Pollard, Chongyin Yang, Naveen K. Dandu, Sha Tan, Jigang Zhou, Jian Wang, Xinzi He, Xiyue Zhang, Ai-Min Li, Enyuan Hu, Xiao-Qing Yang, Anh Ngo, Oleg Borodin, Chunsheng Wang
Summary: Liquefying halogen or inter-halogen compounds is crucial for achieving high reversibility in lithium halide cathodes. This can be done using interhalogen compounds with different electronegativity or by lowering the temperature. By demonstrating reversible LiCl conversion-intercalation chemistry in organic electrolytes, high reversible specific capacity is achieved in LiCl-LiBr-graphite cathodes at a lower cost than transition metal oxide cathodes.
Article
Nanoscience & Nanotechnology
Syed Q. A. Shah, Muhammet Annaorazov, Gaurab Rimal, Jian Wang, Mario F. Borunda, Jinke Tang, Andrew J. Yost
Summary: Using pulsed laser deposition, a EuO1-x film was deposited on a Si(001) substrate with a MgO buffer, and compared to a heterostructure with an additional BaTi2O5 film on top of the EuO1-x surface. XRD analysis showed that the films had a preferred EuO(111) orientation and the presence of EuSi2, suggesting diffusion of Si or Eu across the MgO buffer layer. The EuO1-x films exhibited a ferromagnetic signature and temperature-dependent exchange bias, while the BaTi2O5 films showed an antiferromagnetic behavior, indicating an origin at the BaTi2O5/EuO1-x interface.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Corbyn Mellinger, Xiao Wang, Arjun Subedi, Andy T. Clark, Takashi Komesu, Richard Rosenberg, Peter A. Dowben, Xuemei Cheng, Xiaoshan Xu
Summary: NiCo2O4 (NCO) films grown on MgAl2O4 (001) substrates were studied with magnetometry and x-ray magnetic circular dichroism based on x-ray absorption spectroscopy and spin-polarized inverse photoemission spectroscopy. The thickness dependence of the magnetic behavior was described using the finite-scaling theory with a critical exponent consistent with high perpendicular magnetic anisotropy. The interfacial layer coupled antiferromagnetically to the optimal layer, generating exchange-spring styled magnetic hysteresis in the thinnest films. The non-optimal and measurement-speed-dependent magnetic properties of the interfacial layer suggested substantial interfacial diffusion.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Spectroscopy
Xinye Yuan, Tianxiao Sun, Elena A. Baranova, Yaser Abu-Lebdeh, Jigang Zhou, Jian Wang, Huaidong Jiang
Summary: CO2 electrochemical reduction (CO2ER) is a promising technology for converting CO2 into useful chemicals and fuels, reducing greenhouse gas emissions. Cu nanoparticles-based catalysts are an excellent choice for CO2ER due to their high conductivity and catalytic activity. This study used STXM and spectro-ptychography to investigate the chemical and electronic structural changes of CuAg nanocatalysts during CO2ER. The observed self-aggregation and oxidation of Cu species provide insights into the loss of catalytic activity in CuAg nanocatalysts after CO2ER.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Spectroscopy
Tianxiao Sun, Shengnan Zuo, Bo He, Xinye Yuan, Guixiang Li, Jigang Zhou, Markus Weigand, Antonio Abate, Jian Wang
Summary: The structural and compositional properties of tin halide perovskites were investigated using scanning transmission soft X-ray microscopy (STXM) and spectro-ptychography techniques. The study revealed the spectral characteristics of main components in Sn-based perovskites and differences between samples with and without adding an ionic liquid. Chemical imaging showed that the ionic liquid-treated sample exhibited a more homogeneous perovskite phase, and XANES resonance features supported the protective role of the ionic liquid in perovskite formation and stabilization.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Physics, Condensed Matter
Takashi Komesu, Will Echtenkamp, Christian Binek, Peter A. Dowben
Summary: The induced spin polarization of a palladium overlayer on antiferromagnetic and magneto-electric Cr2O3(0001) is due to the boundary polarization at the Cr2O3(0001). The Pd thin film appears to exhibit ferromagnetism on its own, potentially caused by strain. Experimental evidence of ferromagnetic spin polarization is found in Pd thin films on a single crystal of Cr2O3(0001), particularly in the thin limit of around 1-4 nm. The presence of significant spin polarization is observed in 10 A thick Pd films on Cr2O3(0001) above the Neel temperature of bulk Cr2O3. Additionally, the spin polarization of Pd on Cr2O3 includes an in-plane component due to strain in the Pd adlayer.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Review
Biochemistry & Molecular Biology
Saeed Yazdani, Jared Phillips, Thilini K. K. Ekanayaka, Ruihua Cheng, Peter A. A. Dowben
Summary: The influence of different substrates on spin crossover molecules is comprehensively reviewed in this article. Non-metallic substrates like graphite show promise, while 2D semiconductor surfaces have minimal interaction with spin crossover molecules. Metallic substrates such as gold and copper suppress spin state changes and affect the switching process. The influence of the substrate on spin crossover thin films depends on film thickness and deposition method.
Article
Multidisciplinary Sciences
Yanfei Zhu, Qi Zhang, Yun Zheng, Gaoran Li, Rui Gao, Zhihong Piao, Dan Luo, Run-Hua Gao, Mengtian Zhang, Xiao Xiao, Chuang Li, Zhoujie Lao, Jian Wang, Zhongwei Chen, Guangmin Zhou
Summary: Composite-polymer-electrolytes (CPEs) embedded with an unsaturated coordination Prussian blue analog (UCPBA) filler demonstrate fast and preferential Li+ conduction through a chemically stable electrolyte/filler interface (EFI). The unsaturated Co-O coordination in UCPBA ensures a stable EFI and prevents side reactions, while the Lewis-acid metal centers attract the Lewis-base anions of Li salts, enhancing Li+ disassociation and transference number (tLi+). These CPEs exhibit high room-temperature ionic conductivity and excellent cyclability and capacity retention for solid-state lithium-sulfur batteries.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Spectroscopy
Chunyang Zhang, Jiatang Chen, Hao Yuan, Jian Wang, Tianxiao Sun, Drew Higgins, Adam P. Hitchcock
Summary: Soft X-ray spectro-ptychography was used to measure nickel-nitrogen-carbon electrocatalysts with atomically dispersed active sites. The spatial resolution of ptychography was improved compared to scanning transmission X-ray microscopy (STXM). Chemical mapping of key components was achieved through fits of reference spectra to absorption signals derived from ptychographic reconstruction. This study highlights the added value of spectro-ptychography for electrocatalyst research compared to STXM.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Spectroscopy
Joseph Stitsky, Jian Wang, Stephen Urquhart
Summary: Spectroptychography is used to improve the spatial resolution of x-ray spectromicroscopy for finer chemical microanalysis. Near edge X-ray absorption fine structure (NEXAFS) provides chemical sensitivity, while ptychography offers additional phase information and potential chemical information. This paper explores the chemical information available in phase for silicon dioxide nanospheres.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Nanoscience & Nanotechnology
Zhelin Qu, Shuo Liu, Xudong Fan, Changfeng Fang, Jun-Lei Wang, Xian Zhao
Summary: Aided by computer-generated holography, holographic optical tweezers allow for versatile manipulation of particles and objects. To improve the responsiveness of the manipulation when dealing with a large number of objects, we propose an optimized hologram generation method using an improved iterative algorithm with parallel computation. This method requires fewer iterations than established methods and produces high-quality holograms, leading to a responsive and stable micromanipulation.
