| 1. |
- Husain, Sajid, et al.
(författare)
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Spin pumping in the Hensler alloy Co2FeAl/MoS2 heterostructure : Ferromagnetic resonance experiment and theory
- 2018
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Ingår i: Physical Review B. - : AMER PHYSICAL SOC. - 2469-9950 .- 2469-9969. ; 98:18
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Tidskriftsartikel (refereegranskat)abstract
- Spin pumping from the full Heusler alloy Co2FeAl film into the transition-metal dichalcogenide MoS2 is reported. Plasma-assisted sulfurization of ion-beam sputtered Mo films of different nominal thicknesses is employed to first fabricate large area high-quality MoS2 sheets [thicknesses: 1, 2, 3, and 4 monolayers (MLs)] on SiO2/Si substrates, followed by deposition of Co2FeAl films with a fixed thickness of 8 nm. The spin pumping is investigated by measuring the changes in the damping constant in the Al(5 nm) capped Co2FeAl/MoS2 bilayers using ferromagnetic resonance spectroscopy. The study demonstrates that even 1 ML of MoS2 possesses high enough spin-orbit coupling strength to enhance damping from 5.5(+/- 0.2) x 10(-3) in Al(5 nm)/Co2FeAl(8 nm) to a nearly saturated value of 8.3(+/- 0.2) x 10(-3) in Al(5 nm)/Co2FeAl(8 nm)/MoS2(1 ML), which is suppressed by inserting a thin Al layer at the Co-2 FeAl/MoS2 interface. The observed enhancement in damping is in agreement with the results from first-principles calculations based on density functional theory. These results open up a paradigm for designing spintronic devices based on heterostructures comprising a full Heusler alloy and the inherently stable MoS2.
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| 2. |
- Sinha, Adrija, et al.
(författare)
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The paradigm of miRNA and siRNA influence in Oral-biome
- 2023
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Ingår i: Biomedicine and Pharmacotherapy. - : Elsevier. - 0753-3322 .- 1950-6007. ; 159
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Forskningsöversikt (refereegranskat)abstract
- Short nucleotide sequences like miRNA and siRNA have attracted a lot of interest in Oral-biome investigations. miRNA is a small class of non-coding RNA that regulates gene expression to provide effective regulation of post-transcription. On contrary, siRNA is 21-25 nucleotide dsRNA impairing gene function post-transcriptionally through inhibition of mRNA for homologous dependent gene silencing. This review highlights the application of miRNA in oral biome including oral cancer, dental implants, periodontal diseases, gingival fibroblasts, oral submucous fibrosis, radiation-induced oral mucositis, dental Pulp, and oral lichenoid disease. Moreover, we have also discussed the application of siRNA against the aforementioned disease along with the impact of miRNA and siRNA to the various pathways and molecular effectors pertaining to the dental diseases. The influence of upregulation and downregulation of molecular effector post-treatment with miRNA and siRNA and their impact on the clinical setting has been elucidated. Thus, the mentioned details on application of miRNA and siRNA will provide a novel gateway to the scholars to not only mitigate the long-lasting issue in dentistry but also develop new theragnostic approaches.
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| 3. |
- Abend, Sven, et al.
(författare)
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Terrestrial very-long-baseline atom interferometry : Workshop summary
- 2024
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Ingår i: AVS Quantum Science. - : American Institute of Physics (AIP). - 2639-0213. ; 6:2
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Forskningsöversikt (refereegranskat)abstract
- This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more kilometer--scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions.
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| 4. |
- Bhattacharjee, Rahul, et al.
(författare)
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Synergy of nanocarriers with CRISPR-Cas9 in an emerging technology platform for biomedical appliances : Current insights and perspectives
- 2022
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Ingår i: Materials & design. - : Elsevier. - 0264-1275 .- 1873-4197. ; 224
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Tidskriftsartikel (refereegranskat)abstract
- Genetic editing technologies have emerged as a potential therapeutic tool in various biomedical fields owing to their applications against cancer, neurological diseases, diabetes, autoimmune disorder, muscu-lar dystrophy, bacterial infections (AMR), and cardiovascular diseases. CRISPR is one such valuable genetic editing tool with extensive therapeutic appliances but with a major challenge in terms of deliv-ery. Herein, we have strived to exploit a synergy of nanocarriers and CRISPR against the aforementioned diseases for their medical applications and explicated their clinical significance including the enhanced delivery via endosomal escape and environmental factors such as light, pH, and stimuli. In addition to highlighting the delivery strategies of nano-carriers for CRISPR and their characterization, we have expounded on the reliant factor of the CRISPR-Cas Complex.
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| 5. |
- Husain, Sajid, et al.
(författare)
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Emergence of spin-orbit torques in 2D transition metal dichalcogenides: A status update
- 2020
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Ingår i: Applied Physics Reviews. - : AIP Publishing. - 1931-9401. ; 7:4
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Tidskriftsartikel (refereegranskat)abstract
- Spin-orbit coupling (SOC) in two-dimensional (2D) materials has emerged as a powerful tool for designing spintronic devices. On the one hand, the interest in this respect for graphene, the most popular 2D material with numerous fascinating and exciting properties, is fading due to the absence of SOC. On the other hand, 2D transition metal dichalcogenides (TMDs) are known to exhibit rich physics including large SOC. TMDs have been used for decades in a variety of applications such as nano-electronics, photonics, optoelectronics, sensing, and recently also in spintronics. Here, we review the current progress in research on 2D TMDs for generating spin-orbit torques in spin-logic devices. Several challenges connecting to thin film growth, film thickness, layer symmetry, and transport properties and their impact on the efficiency of spintronic devices are reviewed. How different TMDs generate spin-orbit torques in magnetic heterostructures is discussed in detail. Relevant aspects for improving the quality of the thin film growth as well as the efficiency of the generated spin-orbit torques are discussed together with future perspectives in the field of spin-orbitronics.
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| 6. |
- Husain, Sajid, et al.
(författare)
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Large Damping-Like Spin–Orbit Torque in a 2D Conductive 1T-TaS2 Monolayer
- 2020
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Ingår i: Nano letters (Print). - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 20:9, s. 6372-6380
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Tidskriftsartikel (refereegranskat)abstract
- A damping-like spin-orbit torque (SOT) is a prerequisite for ultralow-power spin logic devices. Here, we report on the damping-like SOT in just one monolayer of the conducting transition-metal dichalcogenide (TMD) TaS2 interfaced with a NiFe (Py) ferromagnetic layer. The charge-spin conversion efficiency is found to be 0.25 +/- 0.03 in TaS2(0.88)/Py(7), and the spin Hall conductivity (14.9 x 10(s) h/2e Omega(-1) m(-1) is found to be superior to values reported for other TMDs. We also observed sizable field-like torque in this heterostructure. The origin of this large damping-like SOT can be found in the interfacial properties of the TaS2/Py heterostructure, and the experimental findings are complemented by the results from density functional theory calculations. It is envisioned that the interplay between interfacial spinorbit coupling and crystal symmetry yielding large damping-like SOT. The dominance of damping-like torque demonstrated in our study provides a promising path for designing the next-generation conducting TMD-based low-powered quantum memory devices.
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| 7. |
- Husain, Sajid, et al.
(författare)
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Multi-jump magnetization switching in Co2FeAl full Heusler alloy thin films : Experiments and simulations
- 2019
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Ingår i: Journal of Magnetism and Magnetic Materials. - : ELSEVIER SCIENCE BV. - 0304-8853 .- 1873-4766. ; 486
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Tidskriftsartikel (refereegranskat)abstract
- Co2FeAl (CFA) thin films of 50 nm thickness have been grown on MgO (001) single crystal substrates at room temperature with and without post-annealing (PA) at 300 degrees C and 400 degrees C using dual ion-beam sputtering technique. The XRD pattern of the as-grown film revealed that CFA grows with preferred crystallographic orientation on the MgO (001) substrate. Temperature dependent anisotropy measurements on PA films revealed a dominating contribution from cubic anisotropy as confirmed by the analysis of azimuthal angle dependent longitudinal in-plane magneto-optical Kerr effect (MOKE) measurements. The contributions from the cubic and uniaxial anisotropies have also been quantified employing ferromagnetic resonance spectroscopy. Magnetization reversal is accompanied with a plateau in the MOKE hysteresis recorded at various azimuthal angles in the in-plane applied magnetic field configuration. The occurrence of the observed plateau is explained by the presence of a combination of domain walls such as 90 degrees, 135 degrees and 180 degrees domain walls and/or complex domains which is supported by results from micromagnetic simulations. These results demonstrate the feasibility of manipulating the magnetization switching in one of the two ferromagnetic electrodes of the magnetic tunnel junction devices based on Heusler alloy ferromagnetic films.
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| 8. |
- Husain, Sajid, et al.
(författare)
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Observation of Skyrmions at Room Temperature in Co2FeAl Heusler Alloy Ultrathin Film Heterostructures
- 2019
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- Magnetic skyrmions are topological spin-textures having immense potential for energy efficient spintronic devices. Here, we report the observation of stable skyrmions in unpatterned Ta/Co2FeAl(CFA)/MgO thin film heterostructures at room temperature in remnant state employing magnetic force microscopy. It is shown that these skyrmions consisting of ultrathin ferromagnetic CFA Heusler alloy result from strong interfacial Dzyaloshinskii-Moriya interaction (i-DMI) as evidenced by Brillouin light scattering measurements, in agreement with the results of micromagnetic simulations. We also emphasize on room temperature observation of multiple skyrmions which can be stabilized for suitable combinations of CFA layer thickness, perpendicular magnetic anisotropy, and i-DMI. These results provide a significant step towards designing of room temperature spintronic devices based on skyrmions in full Heusler alloy based thin films.
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| 9. |
- Husain, Sajid, et al.
(författare)
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Probing Charge Density Wave Effects in 1T-TaS2 Monolayer/Ni81Fe19 Heterostructure: A Spin Dynamics Approach
- 2021
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Ingår i: Acs Applied Electronic Materials. - : American Chemical Society (ACS). - 2637-6113. ; 3:8, s. 3321-3328
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Tidskriftsartikel (refereegranskat)abstract
- The transition metal dichalcogenide 1T-TaS2 is known to exhibit a number of collective electronic states known as charge density wave (CDW) instabilities. Intriguing phenomena such as a large damping-like spin-orbit torque (SOT) have been reported in monolayer 1T-TaS2 [Nano Lett. 2020, 20 (9), 6372-6380]. Probing of CDWs in monolayer thick 1T-TaS2 has been an inconceivable task. Here, the temperature-dependent spin dynamics and the effect of CDWs in the 1T-TaS2(monolayer)/Ni81Fe19 (Py) (7 nm) heterostructure are reported. Employing ferromagnetic resonance, the effect of the different commensurate (C) and nearly commensurate (NC) CDW states on the spin dynamics during heating and cooling cycles has been characterized by use of the effective damping constant and the spin mixing conductance of the heterostructure. In addition, these CCDW and NCCDW states, which affect the SOT efficiencies due to damping- and field-like SOTs, have been evaluated by using angle-dependent planar Hall effect measurements in controlled cooling and heating cycles. Our findings provide a fundamental understanding of the effect of different CDW states on the spin dynamics in twodimensional 1T-TaS2 monolayer interfaced Py.
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| 10. |
- Singh, Suraj Kumar, et al.
(författare)
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Effect of oxygen partial pressure on the density of antiphase boundaries in Fe3O4 thin films on Si(100)
- 2018
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 448, s. 303-309
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Tidskriftsartikel (refereegranskat)abstract
- PoPolycrystalline Fe3O4 thin films were grown on Si(100) substrate by reactive DC sputtering at different oxygen partial pressures PO2" tabindex="0" id="MathJax-Element-3-Frame" class="MathJax_SVG" style="font-size: 90%; display: inline-block; position: relative;"> for controlling the growth associated density of antiphase boundaries (APBs). The micro-Raman analyses were performed to study the structural and electronic properties in these films. The growth linked changes in the APBs density are probed by electron–phonon coupling strength (λ) and isothermal magnetization measurements. The estimated values of λ are found to vary from 0.39 to 0.56 with the increase in PO2" tabindex="0" id="MathJax-Element-4-Frame" class="MathJax_SVG" style="font-size: 90%; display: inline-block; position: relative;"> from 2.2 × 10−5 to 3.0 × 10−5 Torr, respectively. The saturation magnetization (saturation field) values are found to increase (decrease) from 394 (5.9) to 439 (3.0) emu/cm3 (kOe) with the increase in PO2" tabindex="0" id="MathJax-Element-5-Frame" class="MathJax_SVG" style="font-size: 90%; display: inline-block; position: relative;">. The sharp Verwey transition (∼120 K), low saturation field, high saturation magnetization and low value of λ (comparable to the bulk value ∼0.51) clearly affirm the negligible amount of APBs in the high oxygen partial pressure deposited thin films.
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