Browsing School of Physics by Author "Venkatesan, Munuswamy"
Now showing items 1-20 of 27
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Accelerated discovery of new magnets in the Heusler alloy family
Sanvito, Stefano; Venkatesan, Munuswamy (2017) -
Anisotropic ferromagnetism in substituted zinc oxide
Lunney, James; Coey, John; Venkatesan, Munuswamy (2004)The high-temperature ferromagnetism in doped zinc oxide films was discussed. A connection between the electronic structure of (Zn 1-xMx)O and its ferromagnetic properties was found. A new source of magnetism in these oxides, ... -
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 ... -
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. ... -
Detection of the Faraday Chiral Anisotropy
Venkatesan, Munuswamy; Coey, John (2021)Being the intimate connection between chirality and magnetism, magneto-chiral anisotropies (MChA) - featuring non-reciprocal optical responses in chiral systems depending on the relative direction of the magnetic field B ... -
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. ... -
Electrical detection of magnetic skyrmyons in a magnetic tunnel junction
Venkatesan, Munuswamy; Coey, John (2022)Magnetic skyrmions are promising information carriers for dense and energy-efficient information storage owing to their small size, low driving-current density, and topological stability. Electrical detection of skyrmions ... -
Evaporation of water and urea solution in a magnetic field; the role of nuclear isomers
Moebius, Matthias; Coey, John; Venkatesan, Munuswamy (2023)Hypothesis Ortho and para water are the two nuclear isomers where the hydrogen protons align to give a total nuclear spin of 1 or 0. The equilibrium ratio of 3:1 is established slowly in freshly evaporated water vapour ... -
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 ... -
A fully compensated ferrimagnetic half metal Co1-xCrxS2 with Curie temperature above room temperature
Venkatesan, Munuswamy; Coey, John (2023)Fully compensated ferrimagnetic half metals have attracted great attention in spintronics. Unlike many previous calculations based on hypothetical ordered alloys, here we look for existing solid solution series taking as ... -
History of Magnetism and Basic Concepts
Venkatesan, Munuswamy; Coey, John (Springer, Cham, 2021)Magnetism is a microcosm of the history of science over more than two millennia. The magnet allows us to manipulate a force field which has catalyzed an understanding of the natural world that launched three revolutions. ... -
Imaging domains in a zero-moment half-metal
Venkatesan, Munuswamy; Coey, John; Teichert, N.; Schäfer, R. (2019)We have a choice of methods for examining domains at the surface of a ferromagnet that depend on probing the stray field distribution, but these methods do not work in antiferromagnets or compensated ferrimagnets, which ... -
Liquid Phase Exfoliation of Nonlayered Non-Van der Waals Iron Trifluoride (FeF3) into 2D-Platelets for High-Capacity Lithium Storing Cathodes
Coleman, Jonathan; Venkatesan, Munuswamy; Nicolosi, Valeria; Konkena, Bharathi (2022)Developing high-performance cathode materials for lithium-ion batteries is necessary to maximise both energy and power density. One promising cathode material is iron trifluoride (FeF3) having a high theoretical capacity ... -
Magnetic control over the fractal dimension of supramolecular rod networks
Venkatesan, Munuswamy; Coey, John (2021)Controlling supramolecular polymerization is of fundamental importance to create advanced materials and devices. Here we show that the thermodynamic equilibrium of Gd3+-bearing supramolecular rod networks is shifted ... -
Magnetic Field Enhancement of Water Evaporation in Confined Spaces
Venkatesan, Munuswamy; Coey, John (2023)Water is studied in confined environments where it evaporates into its own vapor. Simultaneous experiments are conducted for 0.4–0.5 µL droplets confined at the center of 54 mm long microchannels with a cross section of ... -
Magnetic Forces in Paramagnetic Fluids
Venkatesan, Munuswamy; Coey, John (2022)An overview of the effect of a magnetic field gradient on fluids with linear magnetic susceptibilities is given. It is shown that two commonly encountered expressions, the magnetic field gradient force and the concentration ... -
Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3
Coey, John; Venkatesan, Munuswamy; Ackland, Karl (2017) -
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 ... -
Metallic Nitride and Carbide Perovskites: History and Prospects
Venkatesan, Munuswamy; Coey, John (2022)Energy-level diagrams for cubic metallic Fe4N and Mn4N were proposed by Goodenough in the late 1960s. Fe4N is ferromagnetic, but Mn4N is ferrimagnetic with a large moment on Mnc at the cube corner site and a much smaller ... -
Neutron Imaging of Paramagnetic Ions: Electrosorption by Carbon Aerogels and Macroscopic Magnetic Forces
Venkatesan, Munuswamy; Coey, John (2021)The electrosorption of Gd3+ ions from an aqueous 70 mM Gd(NO3)3 solution in monolithic carbon aerogel electrodes was recorded by dynamic neutron imaging. The aerogels have a bimodal pore size distribution consisting of ...