Browsing Physics (Scholarly Publications) by Author "Stamenov, Plamen"
Now showing items 1-20 of 27
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3D Printing of Multifunctional Conductive Polymer Composite Hydrogels
Coleman, Jonathan; Nicolosi, Valeria; Stamenov, Plamen (2023)Functional conductive hydrogels are widely used in various application scenarios, such as artificial skin, cell scaffolds, and implantable bioelectronics. However, their novel designs and technological innovations are ... -
4D full-vector radio frequency complex magnetic susceptibility mapping. Near-field imaging of RFID tags
Stamenov, Plamen; Ackland, Karl (2019)Radio frequency identification (RFID) is a technology permeating both everyday life and scientific applications alike. The most prolific passive tag-based system uses inductively-powered tags with no internal power source ... -
Antiferromagnetic single-layer spin-orbit torque oscillators
Stamenov, Plamen; Rode, Karsten; Coey, John (2019)We show how a charge current through a single antiferromagnetic layer can excite and control self-oscillations. Sustained oscillations with tunable amplitudes and frequencies are possible in a variety of geometries using ... -
An apparatus and methodology for high-power SQUID-detected ferromagnetic resonance measurements
Stamenov, Plamen; O'Reilly, James M. (2019)Historically, ferromagnetic resonance has been dominated by inductive techniques, for the best part of the last 80 years. It has been only in the last 20 years that non-inductive techniques, such as Ferromagnetic Resonance ... -
Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-rangeferromagnetic exchange, and high Curie temperature
Venkatesan, Munuswamy; Coey, John; Stamenov, Plamen (2022)Metallic Mn-based alloys with a nearest-neighbor Mn-Mn distance greater than 0.4 nm exhibit large, well-localized magnetic moments. Here we investigate the magnetism of tetragonal Au 4 Mn with a Curie temperature of ... -
CALPHAD-assisted development of in-situ nanocrystallised melt-spun Co-Fe-B alloy with high Bs (1.57 T)
Stamenov, Plamen (2021)A thermodynamics-based approach, Calculation of Phase Diagram (CALPHAD), combined with topological instability parameters are proposed and experimentally evaluated, in order to optimise in-situ nanocrystallisation of rapidly ... -
Deformation and necking of liquid droplets in a magnetic field.
Moebius, Matthias; Stamenov, Plamen; Venkatesan, Munuswamy; Coey, John (2022)Pendant droplets of water and paramagnetic solutions are studied in the presence of uniform and nonuniform magnetic fields produced by small permanent magnet arrays, both in static conditions and during dynamic pinch-off. ... -
Effect of insertion layer on electrode properties in magnetic tunnel junctions with a zero-moment half-metal
Stamenov, Plamen; Rode, Karsten; Coey, John; Venkatesan, Munuswamy; Atcheson, Gwenael (2019)Due to its negligible spontaneous magnetization, high spin polarization and giant perpendicular magnetic anisotropy, Mn2RuxGa (MRG) is an ideal candidate as an oscillating layer in THz spin-transfertorque nano-oscillators. ... -
Exchange-driven all-optical magnetic switching in compensated 3d ferrimagnets
Stamenov, Plamen; Coey, John; Rode, Karsten (2020)Understanding how a single laser pulse can toggle magnetization in a compensated 3d ferrimagnet is a critical problem in ultrafast magnetism. To resolve it, we test single-shot all-optical switching of magnetization in Mn ... -
Exfoliation of hematite: Morphological, structural and magnetic investigations
Venkatesan, Munuswamy; Coey, John; Stamenov, Plamen (2022)Three natural specimens of hematite are characterized using X-ray diffraction, magnetometry, IR/Raman and Mössbauer spectroscopy, with focus on the Morin transition. All are exfoliated by grinding and prolonged sonication ... -
High-frequency power loss mechanisms in ultra-thin amorphous ribbons
Stamenov, Plamen (2021)Soft magnetic amorphous materials with ultra-low power loss are highly desirable for high-frequency drive applications. The present work demonstrates the high-frequency power loss performance and underlying loss mechanisms ... -
Highly Conductive Networks of Silver Nanosheets
Stamenov, Plamen; Coleman, Jonathan; Carey, Tian (2022)Although printed networks of semiconducting nanosheets have found success in a range of applications, conductive nanosheet networks are limited by low conductivities (<106 S m−1). Here, dispersions of silver nanosheets ... -
Magnetic order and magnetotransport in half-metallic ferrimagnetic MnyRuxGa thin films
Coey, John; Stamenov, Plamen; Rode, Karsten; Atcheson, Gwenael (2021)The ruthenium content of half-metallic Mn2RuxGa thin films, with a biaxially strained inverse Heusler structure, controls the ferrimagnetism that determines their magnetic and electronic properties. An extensive study of ... -
Magnetic reversal and pinning in a perpendicular zero-moment half-metal
Venkatesan, Munuswamy; Coey, John; Stamenov, Plamen; Rode, Karsten; Atcheson, Gwenael (2021)Compensated ferrimagnets are promising materials for fast spintronic applications based on domain-wall motion as they combine the favorable properties of ferromagnets and antiferromagnets. They inherit from antiferromagnets ... -
Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate
Stamenov, Plamen; Coey, John; Ackland, Karl (2017) -
Magnetocrystalline anisotropy and exchange probed by high-field anomalous Hall effect in fully compensated half-metallic Mn2RuxGa thin films
Coey, John; Stamenov, Plamen; Rode, Karsten; Atcheson, Gwenael (2018)Magnetotransport is investigated in thin films of the half-metallic ferrimagnet Mn2RuxGa in pulsed magnetic fields of up to 58 T. A nonvanishing Hall signal is observed over a broad temperature range, spanning the compensation ... -
A New Highly Anisotropic Rh-Based Heusler Compound for Magnetic Recording
Coey, John; Stamenov, Plamen (2020)The development of high-density magnetic recording media is limited by superparamagnetism in very small ferromagnetic crystals. Hard magnetic materials with strong perpendicular anisotropy offer stability and high recording ... -
Oxygen Vacancy in WO<inf>3</inf> Film-based FET with Ionic Liquid Gating
Stamenov, Plamen; Coey, John; Atcheson, Gwenael (2017) -
Single pulse all-optical toggle switching of magnetization without gadolinium in the ferrimagnet Mn2RuxGa
Stamenov, Plamen; Rode, Karsten; Atcheson, Gwenael (2020)Energy-efficient control of magnetization without the help of a magnetic field is a key goal of spintronics. Purely heat-induced single-pulse all-optical toggle switching has been demonstrated, but so far only in Gd-based ... -
Single-pulse all-optical partial switching in amorphous DyxCo1-xand TbxCo1-xwith random anisotropy
Coey, John; Stamenov, Plamen (2022)Repeated uniform switching of the magnetization of thin films of ferrimagnetic amorphous Gdx (FeCo)1 x in response to single fast laser pulses is well established. Here, we report unusual toggle switching in thin films ...