Article
Physics, Multidisciplinary
Soho Shim, M. Mehraeen, Joseph Sklenar, Junseok Oh, Jonathan Gibbons, Hilal Saglam, Axel Hoffmann, Steven S-L Zhang, Nadya Mason
Summary: Recent studies have shown that a moderate change in the spin orientation of a collinear antiferromagnet can have a significant effect on the electronic band structure. In this study, unidirectional magnetoresistance (UMR) was observed in the antiferromagnetic phase of a FeRh/Pt bilayer. The researchers found that field-induced spin canting greatly enhances the UMR effect.
Article
Materials Science, Multidisciplinary
Nisha Shahi, Ajit K. Jena, Gaurav K. Shukla, Vishal Kumar, Shivani Rastogi, K. K. Dubey, Indu Rajput, Sonali Baral, Archana Lakhani, Seung-Cheol Lee, Satadeep Bhattacharjee, Sanjay Singh
Summary: This study provides a detailed investigation of the crystal structure and anomalous Hall effect in Mn2CoAl, revealing the presence of antisite disorder between Mn and Al atoms, which enhances the Berry curvature and increases the value of intrinsic anomalous Hall conductivity.
Article
Materials Science, Multidisciplinary
Takuma Ogasawara, Kim-Khuong Huynh, Time Tahara, Takanori Kida, Masayuki Hagiwara, Denis Arcon, Motoi Kimata, Stephane Yu Matsushita, Kazumasa Nagata, Katsumi Tanigaki
Summary: A very large negative magnetoresistance is observed in the insulating regime of the antiferromagnet BaMn2Bi2 when a magnetic field is applied perpendicular to the direction of the sublattice magnetization, allowing it to reenter a metallic state. This effect is seemingly unrelated to any field-induced magnetic phase transition, and is associated with the extreme sensitivity of conduction processes of holelike carriers to the infinitesimal field-induced canting of the sublattice magnetization.
Article
Physics, Applied
Keliu Luo, Yonghai Guo, Wangda Li, Bo Zhang, Bo Wang, Jiangwei Cao
Summary: A giant magnetoresistance (GMR) sensor with a Wheatstone bridge structure and an out-of-plane linear response was developed using a synthetic antiferromagnetic structure. This sensor exhibits a linear response to out-of-plane magnetic fields and has adjustable dynamic ranges based on the thickness of the Co-free layer. A similar Wheatstone bridge sensor consisting of magnetic tunnel junctions was also proposed, showing promising applications in three-dimensional magnetic field detection and current sensing field.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Baidyanath Sahu, R. Djoumessi Fobasso, Andre M. Strydom
Summary: The new polycrystalline compound Gd2AgSi3 shows complex magnetic behavior with two magnetic phase transitions observed despite a single site occupied by Gd atom. It exhibits a minimum in resistivity in the paramagnetic state and negative magnetoresistance over a wide temperature range, similar to exotic Gd2PdSi3 in the ternary family. The isothermal magnetic entropy change, adiabatic temperature change, and refrigerant capacity reach substantial values for a magnetic field change of 0-9 T.
Article
Materials Science, Multidisciplinary
Vinay Sharma, Rajeev Nepal, Ramesh C. Budhani
Summary: This research reports on magnetotransport measurements of Mn3Sn thin films grown on single-crystal MgO substrates. The films exhibit weak magnetism and resistivity at room temperature, and different magnetic phases at different temperatures, revealing the effects of topologically protected spin textures.
Article
Multidisciplinary Sciences
Tobias Warnatz, Fridrik Magnus, Nanny Strandqvist, Sarah Sanz, Hasan Ali, Klaus Leifer, Alexei Vorobiev, Bjoergvin Hjorvarsson
Summary: The strength of interlayer exchange coupling in [Fe/MgO]N(001) superlattices depends on the number of bilayer repeats (N). The exchange coupling is antiferromagnetic for all thicknesses investigated, being nine times larger in a sample with N = 4 compared to N = 2. The magnetic switching sequence in samples with N = 4 and N = 8 is determined using polarized neutron reflectometry, with the outermost layers responding at the lowest fields due to having the weakest interlayer exchange coupling.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Silvia Damerio, Alexey A. Kaverzin, Vaclav Ocelik, Geert R. Hoogeboom, Bart J. van Wees, Beatriz Noheda
Summary: CaFe2O4 is a uniaxial antiferromagnet with two coexisting magnetic orderings; investigations reveal that uncompensated spins at antiphase boundaries between antiferromagnetic domains exhibit specific responses under varying magnetic fields, which may affect the properties of the antiferromagnet.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
Nicolas S. S. Beermann, Savio Fabretti, Karsten Rott, Hassan A. A. Hafez, Guenter Reiss, Dmitry Turchinovich
Summary: This study successfully measured the conductivity of a Ru/Co bilayer nanostructure in a contact-free manner using THz time-domain spectroscopy, resolving the complex current pathways within the nanostructure and determining the degree of electronic transparency of the internal interface between the Ru and Co nanolayers.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Clemens Muehlenhoff, Michal Krupinski, Arkadiusz Zarzycki, Manfred Albrecht
Summary: In this study, the magnetotransport properties of Co/Pt based perpendicular synthetic antiferromagnetic (p-SAF) structures with Ru interlayers were investigated. The number of Co/Pt multilayer (ML) stacks and Ru interlayers in the p-SAF structures were varied to examine changes in their magnetoresistive effects. The alignment of magnetization directions of the MLs in the ML/Ru/ML stacks of the p-SAF generated a giant magnetoresistance effect (GMR), while the anisotropic magnetoresistance effect (AMR) at each ML further influenced the resistance of the system. The study results have important implications for understanding and application of magnetoresistive effects.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Zexin Feng, Xiaorong Zhou, Libor Smejkal, Lei Wu, Zengwei Zhu, Huixin Guo, Rafael Gonzalez-Hernandez, Xiaoning Wang, Han Yan, Peixin Qin, Xin Zhang, Haojiang Wu, Hongyu Chen, Ziang Meng, Li Liu, Zhengcai Xia, Jairo Sinova, Tomas Jungwirth, Zhiqi Liu
Summary: This study reports an anomalous Hall effect in collinear altermagnetic ruthenium dioxide, with an anomalous Hall conductivity exceeding 1,000 omega(-1) cm(-1). The phenomenon arises from an alternative magnetic phase in RuO2, characterized by alternating spin polarization in both real-space crystal structure and momentum-space band structure. The results could potentially lead to the exploration of topological Berry phases and dissipationless quantum transport in crystals of abundant elements and with a compensated antiparallel magnetic order.
NATURE ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
N. O. Antropov, E. A. Kravtsov, M. V. Makarova, V. V. Proglyado, T. Keller, I. A. Subbotin, E. M. Pashaev, G. V. Prutskov, A. L. Vasiliev, Yu. M. Chesnokov, N. G. Bebenin, M. A. Milyaev, V. V. Ustinov, B. Keimer, Yu. N. Khaydukov
Summary: Research shows that by adjusting the exchange coupling in the structure, spin-flop transition (SFT) can be achieved in artificial ferrimagnets (FEMs) without the need for magnetic anisotropy. In experimental Fe-Gd FEMs, the transition field was successfully lowered by two orders of magnitude using Pd spacers.
Article
Chemistry, Physical
Tomohiro Ichinose, Junichi Ikeda, Yuta Onodera, Tomoki Tsuchiya, Kazuya Z. Suzuki, Shigemi Mizukami
Summary: A magnetic tunnel junction (MTJ) is a key device in spintronics applications, such as magnetoresistive random access memory (MRAM). The current standard magnetic material for MTJs is a body-centered cubic (bcc) FeCo(B), which shows large tunnel magnetoresistance (TMR) and high perpendicular magnetic anisotropy (PMA), both crucial for high-memory capacity MRAM. However, bcc Co is thermodynamically unstable, so it is aimed to explore metastable bcc Co based alloys. In this study, we propose a metastable bcc Co based alloy with added Mn and Fe, and demonstrate large TMR effects at both elevated and low temperatures using in-plane magnetized MTJs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Mingxing Wu, Kouta Kondou, Taishi Chen, Satoru Nakatsuji, Yoshichika Otani
Summary: In this study, the magnetotransport properties of a microfabricated Mn3Ge single crystal were investigated. Anomalous anisotropic magnetoresistance with fourfold symmetry and positive high-field longitudinal magnetoresistance below the critical temperature were observed. The temperature-induced tilting of the Weyl nodes may be the possible cause. This study contributes to the understanding of magnetotransport properties in the Weyl fermion system.
Article
Materials Science, Multidisciplinary
Jiaji Zhao, Bingyan Jiang, Jinying Yang, Lujunyu Wang, Hengjie Shi, Guang Tian, Zhilin Li, Enke Liu, Xiaosong Wu
Summary: In a magnetic metal, the sum of the ordinary Hall resistance and the anomalous Hall resistance is generally considered as the Hall resistance. However, this empirical relation is no longer valid when either the ordinary Hall angle or the anomalous Hall angle is not small. By using the proper conductivity relation, a B-linear magnetoresistance induced by the anomalous Hall effect (AHE) is revealed, which gives rise to a characteristic bowtie shape depending on the sign of the anomalous Hall angle. The nonlinearity of the Hall resistance in a single-band system and the appearance of a B-symmetric component in the Hall reflect the fundamental difference between the ordinary Hall effect and the AHE. Furthermore, the proposed mechanism can well explain the unusual magnetoresistance and Hall effect observed in Co3Sn2S2.
Article
Nanoscience & Nanotechnology
Sabeen Fatima, Xu Bin, Mohammad Ali Mohammad, Deji Akinwande, Syed Rizwan
Summary: This research presents a facile and inexpensive fabrication scheme for free-standing memory devices based on graphene and MXene, showing high durability and retention time of 10(4) seconds. By utilizing complementary and capacitive resistive switching mechanisms, carbon cells and paper-based memory devices were designed with memory properties.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ayesha Zaheer, Syedah Afsheen Zahra, Muhammad Z. Iqbal, Asif Mahmood, Salem Ayaz Khan, Syed Rizwan
Summary: Due to their high energy storage capacity, two-dimensional transition metal carbides (MXenes) have been widely studied as a promising candidate for supercapacitors. In this study, the synthesis, computational and electrochemical properties of pristine and nickel-doped niobium-carbide (Nb2C) MXenes were reported. The introduction of nickel increased the total density of states (TDOS) and showed a continuous density of states (DOS) pattern, indicating coupling between nickel and pristine MXene. The Ni-doped sample exhibited a significant capacitive performance and a high capacitance retention up to 10,000 cycles.
Review
Biochemistry & Molecular Biology
Xiaoxiao Zheng, Rongli Zhai, Zihao Zhang, Baoqing Zhang, Jiangwei Liu, Aamir Razaq, Muhammad Ashfaq Ahmad, Rizwan Raza, Muhammad Saleem, Syed Rizwan, Syed Hassan Mujtaba Jafri, Hu Li, Raffaello Papadakis
Summary: Composite materials and their applications, including graphene oxide (GO), have gained significant attention in recent years. GO has attracted widespread interest due to its excellent properties and ability to be chemically modified. This review highlights the recent advances in novel dyes and pigments incorporating GO, emphasizing the interactions between graphene and other materials. The unique structure and properties of GO have important effects on the performance of hybrid dyes and pigments, expanding their applications in various fields.
Article
Nanoscience & Nanotechnology
Syedah Afsheen Zahra, Babak Anasori, Muhammad Z. Iqbal, Florent Ravaux, Mohammednoor Al Tarawneh, Syed Rizwan
Summary: The study reports V2CTx MXene and multiwall carbon nanotube composites as electrode materials for hybrid energy storage devices, showing excellent electrochemical performance and good cyclic stability.
Article
Electrochemistry
Syedah Afsheen Zahra, M. Waqas Hakim, Muhammad Adil Mansoor, Syed Rizwan
Summary: This study reports the synthesis of double transition metal carbides Mo(2)TiC(2)T(x) and Mo2Ti2C3Tx for overall water splitting in alkaline media. The results show that these catalysts exhibit excellent performance in both the hydrogen evolution reaction and the oxygen evolution reaction, opening up new possibilities for clean hydrogen production.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Sabeen Fatima, Syed Rizwan
Summary: Due to the increasing demand for water, it is crucial to find new fast and reliable methods for purifying water from organic pollutants. Various catalysts and photocatalysts have been designed to remove organic azo dyes from water to meet the critical needs for water. In this study, tin-doped bismuth ferrite (BFO) nanoparticles were synthesized using the sol-gel technique. Furthermore, BFSO/GNP nanohybrids were synthesized by mixing BFSO nanoparticles with graphene nanoplatelets (GNPs) through a simple and cost-effective coprecipitation process. The results showed that BFSO/GNP nanohybrids are effective in removing dyes from water, even in the absence of light.
Article
Nanoscience & Nanotechnology
Rabia Tahir, Sabeen Fatima, Syedah Afsheen Zahra, Deji Akinwande, Hu Li, Syed Hassan Mujtaba Jafri, Syed Rizwan
Summary: In this study, a simple approach to observe frequency-dependent ferroelectricity and multiferroicity in 2D Ti3C2Tx MXene film at room-temperature was reported. The results confirmed the presence of strong magneto-electric coupling and showed the control of electric polarization by magnetic fields. The ferroelectric Ti3C2Tx MXene film was also employed as an active layer in resistive data storage devices, resulting in stable switching behavior and improved on/off ratio.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Zulqarnain Haider, Sabeen Fatima, Syedah Afsheen Zahra, Hu Li, Syed Hassan Mujtaba Jafri, Faheem Amin, Syed Rizwan
Summary: A strategy for surface modification of V2CTx MXene by loading Ag-NPs resulted in a bifunctional hybrid electrocatalyst with enhanced performance for water splitting. The hybrid exhibited better performance than individual MXene nanosheets and Ag-NPs, comparable to industrial electrocatalysts RuO2 and Pt. The uniform loading of Ag-NPs on 2D MXene sheets acted as a conductive agent and facilitated ion transport, leading to improved catalyst activity.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Sabeen Fatima, Yuqian Gu, Sung Jin Yang, Shanmukh Kutagulla, Syed Rizwan, Deji Akinwande
Summary: Two-dimensional (2D) materials, including molybdenum disulfide (MoS2), have attracted significant attention due to their unique properties. This study synthesized MoS2 through sulfurization of molybdenum metal or molybdenum trioxide precursor on silicon/silicon dioxide substrate. MoO3 sulfurization resulted in higher quality monolayer MoS2 compared to Mo sulfurization, exhibiting nonvolatile resistive switching and p-type material growth with high carrier mobility. These findings highlight the importance of synthesizing high-quality MoS2 for various technological applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
Sana Zainab, Muhammad Azeem, Saif Ullah Awan, Syed Rizwan, Naseem Iqbal, Jamshaid Rashid
Summary: In this report, we developed different fabrication parameters to tailor the optical bandgap of graphene oxide (GO) nanosheets for electronic industry. We reduced the bandgap of GO nanosheets by optimizing the oxidation level and fabricating 2-dimensional nanocomposites containing GO/Iron-oxide. The reduction in bandgap and the interaction among the constituents of the nanocomposite make 5%-iron-oxide/95%-GO nanosheet sample a potential candidate for electronic devices.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
M. Waqas Hakim, Sabeen Fatima, Rabia Tahir, Muhammad Z. Iqbal, Hu Li, Syed Rizwan
Summary: MXenes and 2D material composites show great potential in energy storage due to their unique structure, metallic conductivity, and surface tunability. This study presents a simple synthesis method for pristine Mo2TIC2Tx and Ni-intercalated Mo2TiC2Tx free-standing films. The synthesized Ni-Mo2TiC2Tx film exhibits a high gravimetric capacitance of 682 F g-1, compared to the pristine Mo2TiC2Tx film which only has a capacitance of 310 F g-1 at 5 mV s-1. The Ni-Mo2TiC2Tx electrode also demonstrates a high energy density of 59.77 W h kg- 1, power density of 0.4 kW kg- 1, and long-term cyclic stability over 5000 cycles, making it a promising candidate for energy storage devices.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Nanoscience & Nanotechnology
Sabeen Fatima, Yuqian Gu, Sung Jin Yang, Shanmukh Kutagulla, Syed Rizwan, Deji Akinwande
Summary: Two-dimensional materials, especially molybdenum disulfide (MoS2), have attracted significant attention due to their attractive properties and potential applications. In this study, MoS2 was synthesized by chemical vapor deposition sulfurization at different temperatures using molybdenum metal (Mo) or molybdenum trioxide (MoO3) as precursors. The quality of MoS2 grown by MoO3 sulfurization was found to be superior to that grown by Mo sulfurization. Device characteristics of the synthesized MoS2, such as nonvolatile resistive switching and p-type material growth, were also investigated.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Irfan Ali, Zulqarnain Haider, Syed Rizwan
Summary: This study investigates the effects of tin ion intercalation in a two-dimensional transition metal carbide MXene. The Sn@Mo2TiC2 electrode shows high specific capacitance, large diffusion control value, and long-term cyclic performance.
Article
Chemistry, Multidisciplinary
Rabia Tahir, Syedah Afsheen Zahra, Usman Naeem, Deji Akinwande, Syed Rizwan
Summary: The article reports the successful synthesis of ferroelectric and multiferroic 2D materials, MXene, through a simple synthesis approach. The synthesized MXene exhibits ferroelectric and multiferroic properties at room temperature, opening up possibilities for room-temperature electrical and magnetic data storage applications.
Article
Chemistry, Multidisciplinary
Syedah Afsheen Zahra, Syed Rizwan
Summary: This study presents a material design strategy to enhance the electrochemical activity of MXene sheets by introducing carbon nanotubes as conductive network channels. The hybrid catalyst exhibits improved activity for both hydrogen evolution reaction and oxygen evolution reaction, with good stability. This research opens up a new avenue for the development of cost-effective and efficient catalysts for clean hydrogen production.
