Article
Multidisciplinary Sciences
Dmytro Afanasiev, Jorrit R. Hortensius, Mattias Matthiesen, Samuel Manas-Valero, Makars Siskins, Martin Lee, Edouard Lesne, Herre S. J. van Der Zant, Peter G. Steeneken, Boris A. Ivanov, Eugenio Coronado, Andrea D. Caviglia
Summary: Van der Waals magnets provide a platform for exploring low-dimensional magnetism, and using ultrashort pulses of light, researchers have demonstrated control over magnetic anisotropy in the 2D van der Waals antiferromagnet NiPS3. By tuning photon energy in resonance with an orbital transition, they selectively activate a subterahertz magnon mode displaying two-dimensional behavior. The results suggest promising possibilities for manipulating magnetic order in low-dimensional (anti)ferromagnets through orbital resonance excitation.
Article
Multidisciplinary Sciences
Haiyu Wang, Hao Wu, Jie Zhang, Yingjie Liu, Dongdong Chen, Chandan Pandey, Jialiang Yin, Dahai Wei, Na Lei, Shuyuan Shi, Haichang Lu, Peng Li, Albert Fert, Kang L. Wang, Tianxiao Nie, Weisheng Zhao
Summary: In this study, we demonstrate room-temperature spin-orbit torque driven magnetization switching in an all-van der Waals heterostructure using an optimized epitaxial growth approach. By utilizing the topological insulator Bi2Te3 as a spin current source, we are able to achieve switching at a low current density and raise the Curie temperature of Fe3GeTe2.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Banabir Pal, Binoy K. Hazra, Boerge Goebel, Jae-Chun Jeon, Avanindra K. Pandeya, Anirban Chakraborty, Oliver Busch, Abhay K. Srivastava, Hakan Deniz, James M. Taylor, Holger Meyerheim, Ingrid Mertig, See-Hun Yang, Stuart S. P. Parkin
Summary: This study reports a previously unobserved seeded spin-orbit torque (SSOT) that can set the magnetic states in thick layers of ferromagnetic materials. By using spin currents in the interface region and heating, the spin texture is seeded and overcomes the thickness limitation of conventional spin-orbit torques.
Article
Physics, Applied
Myung-Geun Han, Joseph Garlow, Kai Du, Sang-Wook Cheong, Yimei Zhu
Summary: Ferromagnetism in 2D materials is a promising platform for studying emergent electromagnetic phenomena in low dimensions for spintronics applications. In this study, the chirality reversal behavior of chiral soliton lattices in Cr1/3TaS2 across structural defects was directly observed using cryogenic Lorentz phase microscopy. The manipulation of stacking sequence in 2H-TaS2 was shown to locally reduce the antisymmetric exchange interaction, leading to magnetic chirality reversal with direct atomic resolution imaging. These findings highlight the potential of controlling the chirality of topologically nontrivial soliton lattices in 2D magnets through stack engineering.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Qizhong Zhao, Fanghua Tian, Tieyan Chang, Kaiyan Cao, Dingchen Wang, Yin Zhang, Chao Zhou, Xiaoqin Ke, Wenliang Zuo, Yu Wang, Sen Yang, Xiaoping Song
Summary: In this study, the magnetization reversal phenomenon in the Ni20Mn3B6 alloy was investigated at low applied fields, revealing two compensation temperatures. The first temperature is attributed to competition between Mn atoms at different positions, while the second arises from moment rotation to satisfy Zeeman energy. This phenomenon enables tunable switching of magnetization between positive and negative values, providing potential applications in spintronic devices and magnetic storage materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Hailong Lin, Faguang Yan, Ce Hu, Yuanhui Zheng, Yu Sheng, Wenkai Zhu, Ziao Wang, Houzhi Zheng, Kaiyou Wang
Summary: This study demonstrates the current-assisted magnetization reversal in Fe3GeTe2-based vertical homojunction, which provides support for the potential application of vdW magnetism.
Article
Materials Science, Multidisciplinary
S. W. Lovesey
Summary: This article discusses the compulsory polar magnetism when magnetic ions occupy sites without inversion symmetry and its manifestation in neutron diffraction. It also mentions the influence of magnetic space groups and Dirac multipoles on the magnetic structure of materials. The authors raise questions about a recent study that failed to consider polar magnetism, raising concerns about the reliability of the results.
Article
Engineering, Electrical & Electronic
Guanghui Cheng, Mohammad Mushfiqur Rahman, Andres Llacsahuanga Allcca, Avinash Rustagi, Xingtao Liu, Lina Liu, Lei Fu, Yanglin Zhu, Zhiqiang Mao, Kenji Watanabe, Takashi Taniguchi, Pramey Upadhyaya, Yong P. Chen
Summary: Twisted double bilayers of antiferromagnetic chromium triiodide exhibit electrically tunable moire magnetism, with non-trivial magnetic states controlled by twist angle, temperature, and electrical gating.
NATURE ELECTRONICS
(2023)
Article
Engineering, Mechanical
L. Kavitha, T. Pavithra, C. Boopathy, V. Senthil Kumar, Awadhesh Mani, D. Gopi
Summary: This paper investigates the effect of spin torque on the switching dynamics of magnetic solitons in a weak ferromagnetic nanowire under the influence of an electromagnetic wave. The results show that the spin-polarized current can trigger ultrafast switching of electromagnetic solitons in the ferromagnetic nanowire, and the Gilbert damping supports the sustained switching of electromagnetic solitons.
NONLINEAR DYNAMICS
(2022)
Article
Materials Science, Multidisciplinary
Jushin Tei, Takeshi Mizushima, Satoshi Fujimoto
Summary: The measurement of the de Haas-van Alphen effect in UTe2 supports the existence of cylindrical electron and hole Fermi surfaces, indicating that UTe2 is trivial as a 3D time-reversal-invariant topological superconductor. Based on this observation, the possible realization of a topological crystalline superconductor protected by the crystalline symmetry of UTe2 is investigated. Majorana surface states protected by mirror and twofold rotational symmetries for all symmetry-allowed odd-parity pairing states with time-reversal symmetry are examined, and the corresponding topological invariants are clarified. It is found that topological crystalline superconductivity can be realized for all irreducible representations of odd-parity pairing states of UTe2, even for cylindrical Fermi surfaces.
Article
Chemistry, Physical
Yaping Wang, Xinguang Xu, Xian Zhao, Weixiao Ji, Qiang Cao, Shengshi Li, Yanlu Li
Summary: Electrically controlled half-metallicity can be achieved and controlled in antiferromagnets by constructing van der Waals heterostructures, providing a promising candidate for designing advanced nanodevices.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lun-Hui Hu, Xuepeng Wang, T. Shang
Summary: This study reports the spontaneous magnetization in time-reversal-symmetrybreaking superconductors with unitary pairing potentials, showing that unitary pairing can result in spontaneous spin polarization through spin-orbit coupling, offering an alternative explanation for TRS breaking in the absence of inversion symmetry.
Article
Multidisciplinary Sciences
Manabendra Kuiri, Christopher Coleman, Zhenxiang Gao, Aswin Vishnuradhan, Kenji Watanabe, Takashi Taniguchi, Jihang Zhu, Allan H. MacDonald, Joshua Folk
Summary: This study discovered a strong anomalous Hall effect in twisted double bilayer graphene, suggesting the breaking of time reversal symmetry due to orbital ferromagnetism. Gate voltages applied to the device can tune both the flatness and topology of the electronic bands, providing an unusual level of experimental control.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Hao Chen, So Young Jeon, Sara A. Majetich
Summary: The effects of magnetostatic coupling on switching dynamics of patterned disc-shaped magnetic elements were investigated using micromagnetic simulations. The magnetization angle fluctuated more when neighboring dots had opposite magnetization directions, indicating a lower energy barrier for reversal.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Condensed Matter
Sonu Vishvakarma, V Srinivas
Summary: A comprehensive study was conducted on the magnetic, electrical and thermal properties of Ni100-x TM ( x ) (TM = V, Cr, Nb,) alloys around their critical concentration, revealing non-Fermi-liquid behavior and the influence of strongly correlated electron systems and spin fluctuations on the ferromagnetic ordering.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Engineering, Electrical & Electronic
Katragadda Nagamalleswari, P. Tulasirao, Pranab Mandel
Summary: This paper presents the design and fabrication of a cost-effective measurement probe and measurement furnace for measuring material properties under a controlled gas atmosphere. It demonstrates the capability to measure impedance and pyroelectric current up to a temperature of 1000 degrees C, using well-known ferroelectrics and oxide ion conductors.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Debendra Prasad Panda, Diptikanta Swain, Rohit Kumar Rohj, D. D. Sarma, A. Sundaresan
Summary: Organic-inorganic hybrid (OIH) halide perovskite is a promising material in the field of semiconductors, and efforts have been made to design new lead-free OIH halides for optoelectronic applications. We have synthesized a perovskitoid compound and an antiperovskite compound with unique structures and properties. The perovskitoid compound displays switchable dielectric property, while the antiperovskite compound exhibits higher photoluminescence quantum yield and magnetic properties. This structure-property relationship in OIH manganese halides will contribute to the design of new perovskites and antiperovskites.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Debendra Prasad Panda, Diptikanta Swain, Sounak Sarkar, A. Sundaresan
Summary: In this study, two organic-inorganic hybrid halides were synthesized and the role of halogen bonding was revealed. The first compound showed a unique type-II halogen bonding between organic and inorganic ions, leading to structural changes and modulation of photophysical properties. The second compound demonstrated dual-band emission, possibly due to energy transfer from the organic amine to Mn centers. The role of halogen bonding was explored through quantitative electron density analysis and intermolecular interaction energies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Rahul Kumar, A. Sundaresan
Summary: Type-II multiferroics often have lower polarization values than Type-I multiferroics, which requires the use of pyrocurrent measurements. However, this method becomes inadequate when faster dipole relaxation and thermally stimulated free charge carriers overshadow the magnitude of the pyrocurrent. This study demonstrates the effectiveness of the DC bias current technique in overcoming this limitation and characterizing type-II multiferroic materials with small polarization.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Nanoscience & Nanotechnology
Debendra Prasad Panda, Diptikanta Swain, Sundaresan Athinarayanan
Summary: Efforts have been made to design multifunctional lead-free organic-inorganic hybrid (OIH) halide compounds, which are considered as next-generation solar cell materials. However, it is challenging to design OIH halides that exhibit both long-range magnetic ordering and high photoluminescence quantum yield (PLQY) due to the contrasting effect of the compounds' dimensionality. In this study, we demonstrated an approach to enhance PLQY in two-dimensional (2D) Heisenberg antiferromagnets by increasing the alkylene chain length of [H3N-(CH2)(m)-NH3]MnCl4 compounds. These compounds showed long-range antiferromagnetic ordering and an increase in PLQY with increasing spacer cation length. The findings provide insight into the design of new OIH halides with desirable magnetic ordering and PLQY.
Article
Materials Science, Multidisciplinary
Souvik Banerjee, Debendra Prasad Panda, Premakumar Yanda, A. Sundaresan
Summary: We conducted a comprehensive and comparative study on the structural, static, dynamic, and nonequilibrium magnetic properties of the polymorphs of LiFeSnO4. It was found that LiFeSnO4 exhibits two polymorphs, an orthorhombic phase (HT) and a hexagonal phase (LT), which differ in their crystal structures and magnetic properties. Both polymorphs show spin glass behavior and the presence of an exchange bias effect due to magnetic inhomogeneity.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ramakrishna Rao Akurati, Nitchal Kiran Jaladi, Srinivasa Rao Kurapati, Govinda Kapusetti, Mounika Choppadandi, Pranab Mandal
Summary: The communication presents the use of sol-gel method to prepare ferrite nanoparticles with a composition of Co0.88Cu0.12Fe2O4 for magnetic hyperthermia. The optimal weight ratio of ferrite to polyethylene glycol (PEG) was determined to be 1:2 based on the variation of saturation magnetization with annealing temperature. The heating efficiency of the nanoparticles fabricated with this weight ratio was demonstrated through magnetic induction heating experiment, indicating the potential of Co-Cu ferrite nanoparticles as a heating agent.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
P. Tulasirao, Nagamalleswari Katragadda, Pranab Mandal
Summary: Na0.5Bi0.5TiO3 (NBT) is a lead-free perovskite material with ferroelectricity below 300 degrees C. It exhibits oxide ionic conductivity at elevated temperatures, but there is a need for materials with higher conductivity at lower temperatures. NBT-based ferroelectrics have been studied as potential low-temperature ionic conductors for solid oxide fuel cells. In this work, the composition Na0.45Bi0.49Ba0.05Fe0.05Mg0.019Ti0.931O3-delta (NBBTF-C) showed a similar ionic conductivity to NBT at 600 degrees C.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Krishna Manna, Rahul Kumar, Athinarayanan Sundaresan, Srinivasan Natarajan
Summary: New Cu MOFs show polymorphism and have the ability to fix CO2 to cyclic carbonates. They also exhibit Lewis acid catalysis, Lewis base catalysis, and interesting magnetic behavior. The compounds were prepared using different ligands and different reaction conditions, resulting in various structure dimensionalities. The Cu center in the compounds was explored for different catalytic reactions, showing good yields and recyclability. Magnetic studies revealed antiferromagnetic or ferromagnetic interactions in different compounds. This research demonstrates the diversity of copper-containing compounds in extended framework structures.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Debendra Prasad Panda, Diptikanta Swain, Rajamani Raghunathan, A. Sundaresan
Summary: In this study, a newly synthesized lead-free organic-inorganic hybrid compound with one-dimensional chain structure is investigated. The compound exhibits interesting magnetic and photoluminescence properties, including long-range antiferromagnetic ordering and low-dimensional magnetic susceptibility hump. Additionally, the compound displays orange-red emission and shows evidence of electron-phonon coupling.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
S. Athira, Saulo L. L. Silva, Probal Nag, Sushma Lakshmi, C. Sharath Kumar, Debendra Prasad Panda, Sayan Das, Sarita Rajput, Andrews P. Alex, A. Sundaresan, Sivaranjana Reddy Vennapusa, T. Maitra, D. Jaiswal-Nagar
Summary: In this paper, the authors used the distance between the states as a theoretical measure to determine the bipartite entanglement in a one-dimensional magnetic dimer system. The calculation was compared with the concurrence, a well-known entanglement measure, and found to be the same. Experimental verification was done on single crystals of copper acetate, showing the existence of bipartite entanglement even at room temperature. Characterization and calculations revealed the weak intermolecular interactions and low probability of direct Cu-Cu exchange in copper acetate.
NEW JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Arkadeb Pal, T. W. Yen, T. W. Kuo, C. W. Wang, S. M. Huang, M. C. Chou, Y. C. Lai, Y. C. Chuang, P. Yanda, A. Sundaresan, H. S. Kunwar, V. G. Sathe, Ajay Tiwari, D. Chandrasekhar Kakarla, H. D. Yang
Summary: We report the unconventional and interesting multiferroic behavior of a layered noncentrosymmetric ferrimagnetic spin-1/2 system Bi2Cu5B4O14. Neutron powder-diffraction study reveals a robust ferrimagnetic (up arrow down arrow down arrow down arrow down arrow) ordering below TC = 25 K, which remains unaffected even under a high magnetic field of H = 10 T. Interestingly, two successive ferroelectric transitions are observed, one triggered by the magnetostriction effect at TC = TE2 = 25 K and another caused by a structural distortion at TE1 = 32 K.
Article
Materials Science, Multidisciplinary
Rahul Kumar, A. Sundaresan
Summary: In this paper, the field-induced ferroelectricity in BaHoFeO4 within a narrow range of applied magnetic fields (1.5 T H 5 T) is reported. Magnetization measurements reveal magnetic anomalies at TFe ordering of Fe3+, a possible spin structure change of Fe3+, and the antiferromagnetic ordering of Ho3+ sublattices. Heat capacity data did not show any anomaly at TNFe, but exhibited a broad N . Isothermal magnetization measurements indicate a metamagnetic transition at 1.5 T below 40 K. Temperature-dependent dielectric measurements below 1 T reveal two anomalies corresponding to Ho3+ ordering and a possible change in the magnetic phase of the Fe sublattice. These anomalies disappear at higher magnetic fields, and a different dielectric anomaly appears above the metamagnetic transition. A switchable electric polarization appears below 25 K and above the metamagnetic transition field (H 1.5 T), but disappears above 5 T.
Article
Chemistry, Multidisciplinary
Achal Bhiogade, Katragadda Nagamalleswari, Pranab Mandal, Vengadesh Kumara Mangalam Ramakrishnan
Summary: The development of green and renewable energy sources is crucial in light of increasing energy consumption. This study focuses on the improvement of flexible multiferroic composite films for energy collection in the Internet of Things. By adjusting the weight percentages of ferrite compositions, researchers have successfully prepared polymer-based flexible films with enhanced pyroelectric properties. The findings reveal that these composite films exhibit improved pyroelectric energy conversion, with the highest figure of merit observed in the PVDF/nickel ferrite film.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Nagamalleswari Katragadda, Pranab Mandal, Premakumar Yanda, A. Sundaresan, S. D. Kaushik, Weiguo Zhang, P. Shiv Halasyamani, Alicia Maria Manjon-Sanz
Summary: This study reports a perovskite oxide material that belongs to the perovskite structure and exhibits polar and weak ferromagnetic properties above room temperature. These materials show low dielectric loss at temperatures below room temperature, with the electrical response dominated by grain contributions.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
