Article
Materials Science, Multidisciplinary
Moein Adnani, Melissa Gooch, Liangzi Deng, Stefano Agrestini, Javier Herrero-Martin, Hung-Cheng Wu, Chung-Kai Chang, Taha Salavati-fard, Narayan Poudel, Jose Luis Garcia-Munoz, Samira Daneshmandi, Zheng Wu, Lars C. Grabow, Yen-Chung Lai, Hung-Duen Yang, Eric Pellegrin, Ching-Wu Chu
Summary: HoFeWO6 exhibits multiferroicity and magnetoelectric (ME) coupling, with electric polarization onset at 17.8 K and antiferromagnetic ordering. The compound shows metamagnetic behavior at low temperatures directly related to dielectric properties, with a magnetocapacitance (MC) effect observed. X-ray diffraction results confirm the noncentrosymmetric polar structure and suggest Fe3+ cations are antiferromagnetically ordered in a noncollinear fashion. The observed MC effect, change in polarization by magnetic field, and direct correspondence with magnetization support strong ME coupling in HoFeWO6.
Review
Chemistry, Physical
Jiawei Wang, Aitian Chen, Peisen Li, Sen Zhang
Summary: Electric-field control of magnetism is crucial for the next generation of data storage technology. Researchers have explored the electric-field control of magnetism via strain coupling, especially in heterostructures like CoFeB/PMN-PT. Recent experiments in magnetic tunnel junctions/FE architecture show promising results in nonvolatile and reversible electric-field control of tunneling magnetoresistance, indicating great potential for future data storage technology.
Article
Physics, Condensed Matter
Naveen Kumar, Hemant Singh, Satyendra Prakash Pal, Sonu Sarraf, K. L. Yadav, Amit Kumar
Summary: BiFeO3 is an attractive multiferroic ceramic for device application. The study calculated the magnetoelectric coupling coefficient of single-phase BiFeO3 ceramic using theoretical method instead of direct measurement of voltage. An applied magnetic field raises the capacitance of the pellet of BiFeO3, which gives the values of magnetoelectric coupling coefficient.
PHYSICA B-CONDENSED MATTER
(2021)
Review
Chemistry, Physical
Ganesha Channagoudra, Vijaylakshmi Dayal
Summary: This paper emphasizes the progress on magnetoelectric coupling and the impact of charge and strain in composite heterostructures. The direct and converse magnetoelectric effect on improving the magnetoelectric coefficient is discussed. Furthermore, a brief overview of devices based on multiferroic magnetoelectric materials and their future perspectives is presented.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Polymer Science
Liudmila A. Makarova, Danil A. Isaev, Alexander S. Omelyanchik, Iuliia A. Alekhina, Matvey B. Isaenko, Valeria V. Rodionova, Yuriy L. Raikher, Nikolai S. Perov
Summary: Multiferroics are materials that exhibit unique properties under the influence of magnetic and electric fields, achieved through a combination of ferromagnetic and ferroelectric particles. In soft polymer matrices, the separation of particles results in a more complex multiferroic coupling compared to solid composites.
Article
Chemistry, Multidisciplinary
Wenxuan Wang, Wei Sun, Hang Li, Ying Bai, Fengzhu Ren, Caiyin You, Zhenxiang Cheng
Summary: This research focuses on nonvolatile electrical control of magnetism in 2D van der Waals materials, specifically by designing a multiferroic heterostructure with a CrOBr ferromagnetic bilayer and an In2Se3 ferroelectric monolayer. The weaker interlayer exchange coupling in the CrOBr bilayer allows for easier regulation by ferroelectric polarization, enabling reversible shifts between ferromagnetic and antiferromagnetic ordering. This electrically controlled interlayer magnetic coupling may have practical applications in high-sensitivity sensors and high-density data storage using 2D vdW bilayer magnets.
Article
Materials Science, Multidisciplinary
Mengmeng Zhao, Chao Jin, Wei Sun, Wenya Zhai, Fengzhu Ren, Bing Wang
Summary: This work demonstrates an effective method for achieving non-volatile electrical control of two-dimensional magnets. By constructing a heterostructure of BiFeO3 and KNbO3, the magnetic order of BiFeO3 can be changed, showing strong magnetoelectric coupling properties.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
A. Plyushch, D. Lewin, A. Sokal, R. Grigalaitis, V. V. Shvartsman, J. Macutkevic, S. Salamon, H. Wende, K. N. Lapko, P. P. Kuzhir, D. C. Lupascu, J. Banys
Summary: Bulk BaTiO3-xCoFe2O4 (x = 0.1 - 0.6) magnetoelectric composites with high purity and excellent dielectric and magnetic properties were prepared using the phosphate bonded ceramics approach. The dielectric properties were influenced by composition-dependent relaxations and anomalies at different frequencies, while the magnetic properties were limited by the size of CoFe2O4 particles. The measured direct magnetoelectric coupling coefficient was higher than that of conventionally sintered ceramics and comparable to that of core-shell structures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Sukhendu Sadhukhan, Abhik S. Mahapatra, Ayan Mitra, Pabitra K. Chakrabarti
Summary: Nanocrystalline holmium orthoferrite (HoFeO3) was synthesized using the chemical sol-gel technique. Structural investigation and magnetization measurements revealed its multiferroic behavior, establishing its candidacy for multiferroic applications in M-E devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Adrian Begue, Miguel Ciria
Summary: This study demonstrates a structure with a giant magnetoelectric coupling coefficient, showing a value of 15 x 10(-6) s m(-1) at room temperature, which is a 2-fold increment over the previous highest value. The structure can switch the spatial orientation of the magnetization vector with the application of an electric field and exhibits switchable uniaxial magnetoelastic anisotropy, making it ideal for low-energy-consuming spintronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
You Ba, Shihao Zhuang, Yike Zhang, Yutong Wang, Yang Gao, Hengan Zhou, Mingfeng Chen, Weideng Sun, Quan Liu, Guozhi Chai, Jing Ma, Ying Zhang, Huanfang Tian, Haifeng Du, Wanjun Jiang, Cewen Nan, Jia-Mian Hu, Yonggang Zhao
Summary: Our work demonstrates the electric-field control of skyrmions through strain-mediated magnetoelectric coupling in ferromagnetic/ferroelectric multiferroic heterostructures. Experimental results show non-volatile creation and annihilation of multiple skyrmions, indicating potential for more energy-efficient spintronics.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Xin Li, Yu Yun, Arashdeep Singh Thind, Yuewei Yin, Qiang Li, Wenbin Wang, Alpha T. N'Diaye, Corbyn Mellinger, Xuanyuan Jiang, Rohan Mishra, Xiaoshan Xu
Summary: This study investigates the electrical modulation of magnetic states in single-phase multiferroic materials using domain-wall magnetoelectric (ME) coupling. Results show that the domain-wall ME effect is dramatically enhanced when the separation between ferroelectric (FE) domain walls shrinks below the characteristic width of the antiferromagnetic (AFM) domain walls. These findings suggest that the domain-wall ME effect is capable of electrical control of magnetization.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Ping Li, Xue-Song Zhou, Zhi-Xin Guo
Summary: This study proposes a method to efficiently control 2D magnets with a small electric field in a multiferroic heterostructure. The feasibility of this strategy is demonstrated in the bilayer CrI3/BiFeO3(001) heterostructure using first-principles calculations. The heterostructure exhibits strong magnetoelectric coupling, allowing efficient switching between ferromagnetic and antiferromagnetic states of the bilayer CrI3 by the polarized states of BiFeO3(001).
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Lauren M. Garten, Margo L. Staruch, Konrad Bussmann, James Wollmershauser, Peter Finkel
Summary: The study demonstrates that magnetoelectric coupling can be significantly enhanced in specific heterostructures by simultaneously applying multiple strain engineering approaches. This enhancement is achieved by optimizing magnetization reorientation through magnetic anisotropy strain and the use of multilayered magnetic materials, as well as modifying domain-mediated magnetization switching through voltage-induced magnetoelastic anisotropy. The findings of this research are important for realizing energy-efficient magnetoelectric applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Hamed Sharifi Dehsari, Morteza Hassanpour Amiri, Kamal Asadi
Summary: Experimental realization of thin films with significant room-temperature magnetoelectric coupling coefficient α(ME) without an external DC magnetic field has been challenging. Here, large α(ME) of 750 +/- 30 mV Oe(-1) cm(-1) is achieved in multiferroic polymer nanocomposites (MPCs) thin films. The MPCs consist of PMMA-grafted cobalt-ferrite nanoparticles uniformly dispersed in piezoelectric polymer P(VDF-TrFE). Nanoparticle agglomeration is reduced by surface functionalization with PMMA, enabling the uniform dispersion of nanoparticles in submicrometer thin films. This research can promote the development of flexible and printable multiferroic electronic devices for sensing and memory applications.
Article
Physics, Applied
Ekta Goyat, Soumyarup Hait, Vineet Barwal, Gobind Goyat, Rahul Siwach, Sujeet Chaudhary
Summary: This study systematically investigates the magnetic anisotropy in cobalt thin films as a function of thickness. Both the longitudinal magneto-optic Kerr effect and ferromagnetic resonance spectroscopy techniques are employed. The study reveals the sensitivity of magnetic coercivity to crystallite size and surface roughness, and demonstrates the unique role of deposition geometry on magnetic anisotropy.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Materials Science, Multidisciplinary
Lalit Pandey, Sajid Husain, Xin Chen, Vineet Barwal, Soumyarup Hait, Nanhe Kumar Gupta, Vireshwar Mishra, Amar Kumar, Nikita Sharma, Nakul Kumar, L. Saravanan, Dinesh Dixit, Biplab Sanyal, Sujeet Chaudhary
Summary: In this study, BixTey films with tunable Bi/Te composition were prepared using a direct current cosputtering technique. The topological properties were systematically investigated in films of three different Te compositions. The experiments revealed a systematic correlation between the composition of the BixTey films and their topological properties, and first-principles calculations supported the experimental observations.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Soumyarup Hait, Sajid Husain, Himanshu Bangar, Lalit Pandey, Vineet Barwal, Nakul Kumar, Nanhe Kumar Gupta, Vireshwar Mishra, Nikita Sharma, Pankhuri Gupta, Brajesh S. Yadav, Pranaba Kishor Muduli, Sujeet Chaudhary
Summary: In this study, the spin pumping in beta-W/Interlayer (IL)/Co2FeAl (CFA) heterostructures with different ILs of various spin-orbit coupling (SOC) strengths is systematically investigated. The results show that the ILs with weak SOC suppress spin pumping at the beta-W/CFA interface, while the ILs with strong SOC significantly enhance spin pumping. This study provides a tool to increase spin current production and is important for improving the performance of spintronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Nanhe Kumar Gupta, Vineet Barwal, Soumyarup Hait, Lalit Pandey, Vireshwar Mishra, L. Saravanan, Amar Kumar, Nikita Sharma, Nakul Kumar, Sajid Husain, Sujeet Chaudhary
Summary: We conducted a comprehensive investigation on the influence of Argon gas working pressure on Co60Fe20B20 (CFB) thin films. It was found that the working pressure had a significant impact on the coercive field, anisotropy, and surface roughness of the films. The optimal working pressure resulted in films with low coercive field, low anisotropy, and low surface roughness, making them suitable for spintronic memory applications.
Article
Chemistry, Physical
Pradeep Kumar Sharma, T. D. Senguttuvan, V. K. Sharma, Pankaj Patro, Sujeet Chaudhary
Summary: In this study, the thermoelectric performance of PbTe compound was significantly improved through bismuth doping and dispersing SiC nanoparticles. Bismuth doping improved the electrical conductivity, while SiC nanoparticles regulated the Seebeck coefficient and suppressed the lattice thermal conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Soumyarup Hait, Nanhe Kumar Gupta, Nikita Sharma, Lalit Pandey, Nakul Kumar, Vineet Barwal, Prabhat Kumar, Sujeet Chaudhary
Summary: In this work, the spin pumping phenomenon at the interface between thin tungsten disulphide (WS2) films and Co-2 FeAl (CFA) Heusler alloy films was investigated using ferromagnetic resonance (FMR) measurements. The number of monolayers in the WS2 films was confirmed using Raman spectroscopy, and atomic force microscopy and x-ray reflectivity measurements were used to quantify the smoothness of the grown interfaces as well as the individual layer thicknesses in the heterostructure stacks. The study found that damping enhancement reached about 41% with a monolayer of WS2, and the interfacial effective spin mixing conductance and spin transparency of the WS2/CFA interface were 7.47 +/- 0.97 nm(-2) and 73.35 +/- 9.52%, respectively.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Nanhe Kumar Gupta, Sajid Husain, Vineet Barwal, Soumyarup Hait, Lalit Pandey, Vireshwar Mishra, L. Saravanan, Amar Kumar, Nikita Sharma, Nakul Kumar, Sanjay Kumar Kedia, Sujeet Chaudhary
Summary: The influence of annealing temperature on the structural and magnetic properties of Ta/CoFeB/Ta heterostructures was systematically studied. It was found that the damping parameter showed a sharp enhancement and reached a record low value at 400 degrees C. The work highlights the importance of choosing an appropriate annealing temperature for spintronic applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Ekta Goyat, Lalit Pandey, Soumyarup Hait, Nanhe Kumar Gupta, Vireshwar Mishra, Nakul Kumar, Harjinder Singh, Nikita Sharma, Sujeet Chaudhary
Summary: In this study, the influence of growth rate on the structural, magnetic, and transport properties of Ni81Fe19 thin films was investigated. By varying the DC-sputtering power, the magnetic properties of the films were found to be sensitive to the crystallite size, coercivity, and interface width. Furthermore, the study demonstrated the potential for modifying the magnetic properties of NiFe films by tuning the sputtering parameter for spintronic applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Condensed Matter
Lalit Pandey, Sajid Husain, Vineet Barwal, Soumyarup Hait, Nanhe Kumar Gupta, Vireshwar Mishra, Nakul Kumar, Nikita Sharma, Dinesh Dixit, Veer Singh, Sujeet Chaudhary
Summary: In this study, we quantitatively investigate the non-trivial parameters of a highly textured Bi2Te3 topological insulator thin film prepared by sputtering using magnetotransport measurements. Through systematic analyses, we estimate all the topological parameters associated with topological insulators, such as the coherency factor (alpha), Berry phase (Phi(B)), mass term (m), the dephasing parameter (p), slope of temperature dependent conductivity correction (kappa), and the surface state penetration depth (lambda). The obtained values of the topological parameters are comparable to those reported on molecular beam epitaxy grown topological insulators. The epitaxial growth of Bi2Te3 films using sputtering and the investigation of their non-trivial topological states from electron-transport behavior are important for both fundamental understanding and technological applications of topological insulators.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Quantum Science & Technology
Akash Kumar, Pankhuri Gupta, Niru Chowdhury, Kacho Imtiyaz Ali Khan, Utkarsh Shashank, Surbhi Gupta, Yasuhiro Fukuma, Sujeet Chaudhary, Pranaba Kishor Muduli
Summary: Angle-resolved spin-torque ferromagnetic resonance measurements were conducted on Py (Ni81Fe19) and noncollinear antiferromagnetic quantum material r-IrMn3 heterostructures. The results showed that r-IrMn3 is polycrystalline and Py/r-IrMn3 exhibits a large exchange bias at room temperature. Furthermore, a unconventional out-of-plane anti-damping torque was observed when r-IrMn3 is in direct contact with Py, and this unconventional spin-orbit torque efficiency was found to be twice as large as the in-plane spin-orbit torque efficiency. However, the unconventional spin-orbit torque disappeared when a Cu spacer was introduced between Py and r-IrMn3, indicating its origin at the interface.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Applied
Lalit Pandey, Rahul Gupta, Amir Khan, Nanhe Kumar Gupta, Soumyarup Hait, Nakul Kumar, Vireshwar Mishra, Nikita Sharma, Peter Svedlindh, Sujeet Chaudhary
Summary: In this study, magnetic heterostructures consisting of Bi2Te3 (BT) and Co60Fe20B20 (CFB) were fabricated using the DC magnetron sputtering technique to investigate the temperature-dependent spin pumping. The results revealed that the effective spin-mixing conductance is significantly affected by the contribution of two-magnon scattering (TMS) and it increases with decreasing temperature when TMS is absent. Furthermore, magneto-transport measurements indicated that the surface coherence length of BT is consistent with the temperature-dependent effective spin-mixing conductance. The enhancement of effective mixing conductance was found to be correlated with the increased contribution of the topological surface states (TSSs) as evaluated using the weak-anti-localization effect. This study provides insights into the temperature-dependent spin dynamics in sputtered BT/CFB heterostructures and serves as a guide for further exploration of such bilayers for topological-based spintronic applications.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Lalit Pandey, Nakul Kumar, Amir Khan, Nanhe Kumar Gupta, Soumyarup Hait, Vineet Barwal, Vireshwar Mishra, Nikita Sharma, Sujeet Chaudhary
Summary: In this study, layered PdTe2 thin films were successfully synthesized using the sputtering technique, and their structural and morphological qualities were analyzed. The thin films exhibited high orientation along the c-axis of the substrate, suggesting van der Waals epitaxy-driven growth. Magneto-transport measurements on PdTe2 thin films revealed a semi-metallic trend, superconducting transition, and weak antilocalization behavior at low magnetic fields. Additionally, spin dynamics measurements on PdTe2/Co60Fe20B20 bilayers showed large effective spin mixing conductance and spin current density, comparable to topological insulator-ferromagnet heterostructures grown by molecular beam epitaxy. This work lays the foundation for synthesizing Te-based layered TMDs using the industrially viable sputtering technique, and demonstrates the potential for exploring topological superconductivity in PdTe2 films and achieving large spin-charge conversion efficiency in PdTe2/Co60Fe20B20 heterostructures.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sanjay Kumar Kedia, Nakul Kumar, Nikita Sharma, Lalit Pandey, Nanhe Kumar Gupta, Sujeet Chaudhary
Summary: In this study, we investigate the large and tunable exchange bias in Ni81Fe19/Ir7Mn93 polycrystalline bilayer samples. The exchange bias can be controlled by adjusting the grain size of the antiferromagnetic (AF) IrMn layer. The samples exhibit positive exchange bias at room temperature, but show negative exchange bias upon field cooling to 15 K.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Lalit Pandey, Nakul Kumar, Nanhe Kumar Gupta, Vireshwar Mishra, Nikita Sharma, Vineet Barwal, Soumyarup Hait, Sujeet Chaudhary
Summary: We present the results of a study on the structural and magnetotransport properties of Cr-doped Bi2Te3 thin films deposited on Si(100) using the sputtering technique. Our findings suggest that Cr atoms may intercalate between the van der Waals gap of the two quintuple layers of c-axis-oriented Bi2Te3. The doping of Cr changes the temperature-dependent resistivity trend of Bi2Te3 from metallic to insulating behavior and suppresses certain effects in the magneto-transport behavior.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Nanhe Kumar Gupta, Amar Kumar, Lalit Pandey, Soumyarup Hait, Vineet Barwal, Amir Khan, Vireshwar Mishra, Nikita Sharma, Nakul Kumar, Sujeet Chaudhary
Summary: Layered transition metal dichalcogenides (TMDs), specifically MoS2, have been found to have remarkable spintronic properties and can be used as an efficient source of spin current. In this study, the spin-dynamic behavior of MoS2/CoFeB heterostructures was investigated. Raman spectroscopy revealed systematic changes in the characteristic Raman shifts of MoS2 based on the number of layers. Ferromagnetic resonance spectroscopy measurements showed enhanced spin pumping from CoFeB to the MoS2 layer, attributed to the high spin-orbit coupling of monolayer MoS2. The high thermal stability of the sputter grown MoS2/CoFeB heterostructures was demonstrated, making them suitable for spin-orbit torque based magnetic memory applications.
