| 1. |
- Khan, Kacho Imtiyaz Ali, et al.
(author)
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Magnetodynamic properties of ultrathin films of Fe3Sn2 -a topological kagome ferromagnet
- 2024
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In: SCIENTIFIC REPORTS. - 2045-2322. ; 14:1
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Journal article (peer-reviewed)abstract
- Fe3Sn2 is a topological kagome ferromagnet that possesses numerous Weyl points close to the Fermi energy, which can manifest various unique transport phenomena such as chiral anomaly, anomalous Hall effect, and giant magnetoresistance. However, the magnetodynamic properties of Fe3Sn2 have not yet been explored. Here, we report, for the first time, the measurements of the intrinsic Gilbert damping constant (alpha(int)), and the effective spin mixing conductance (g(eff)(up arrow down arrow)) of Pt/Fe3Sn2 bilayers for Fe3Sn2 thicknesses down to 2 nm, for which alpha(int) is (3.8 +/- 0.2)x10(-2), and g(eff)(up arrow down arrow) is (11.7 +/- 0.6) nm(-2). The films have a high saturation magnetization, M-S=620 emu cm(-3), and large anomalous Hall coefficient, R-S=4.6x10(-10) Omega cm G(-1). The large values of g(eff)(up arrow down arrow), together with the topological properties of Fe3Sn2, make Fe3Sn2/Pt bilayers useful heterostructures for the study of topological spintronic devices.
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| 2. |
- Minelli, Caterina, et al.
(author)
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Versailles project on advanced materials and standards (VAMAS) interlaboratory study on measuring the number concentration of colloidal gold nanoparticles
- 2022
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In: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3372 .- 2040-3364. ; 14, s. 4690-4704
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Journal article (peer-reviewed)abstract
- We describe the outcome of a large international interlaboratory study of the measurement of particle number concentration of colloidal nanoparticles, project 10 of the technical working area 34, "Nanoparticle Populations" of the Versailles Project on Advanced Materials and Standards (VAMAS). A total of 50 laboratories delivered results for the number concentration of 30 nm gold colloidal nanoparticles measured using particle tracking analysis (PTA), single particle inductively coupled plasma mass spectrometry (spICP-MS), ultraviolet-visible (UV-Vis) light spectroscopy, centrifugal liquid sedimentation (CLS) and small angle X-ray scattering (SAXS). The study provides quantitative data to evaluate the repeatability of these methods and their reproducibility in the measurement of number concentration of model nanoparticle systems following a common measurement protocol. We find that the population-averaging methods of SAXS, CLS and UV-Vis have high measurement repeatability and reproducibility, with between-labs variability of 2.6%, 11% and 1.4% respectively. However, results may be significantly biased for reasons including inaccurate material properties whose values are used to compute the number concentration. Particle-counting method results are less reproducibile than population-averaging methods, with measured between-labs variability of 68% and 46% for PTA and spICP-MS respectively. This study provides the stakeholder community with important comparative data to underpin measurement reproducibility and method validation for number concentration of nanoparticles.
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| 3. |
- Mudgal, Richa, et al.
(author)
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Magnetic-Proximity-Induced Efficient Charge-to-Spin Conversion in Large-Area PtSe2/Ni80Fe20 Heterostructures
- 2023
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In: NANO LETTERS. - 1530-6984 .- 1530-6992. ; 23:24, s. 11925-11931
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Journal article (peer-reviewed)abstract
- As a topological Dirac semimetal with controllable spin-orbit coupling and conductivity, PtSe2, a transition-metal dichalcogenide, is a promising material for several applications, from optoelectrics to sensors. However, its potential for spintronics applications has yet to be explored. In this work, we demonstrate that the PtSe2/Ni80Fe20 heterostructure can generate large damping-like current-induced spin-orbit torques (SOT), despite the absence of spin-splitting in bulk PtSe2. The efficiency of charge-to-spin conversion is found to be -0.1 +/- 0.02 nm(-1) in PtSe2/Ni80Fe20, which is 3 times that of the control sample, Ni80Fe20/Pt. Our band structure calculations show that the SOT due to PtSe2 arises from an unexpectedly large spin splitting in the interfacial region of PtSe2 introduced by the proximity magnetic field of the Ni80Fe20 layer. Our results open up the possibilities of using large-area PtSe2 for energy-efficient nanoscale devices by utilizing proximity-induced SOT.
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