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Magnetic damping phenomena in ferromagnetic thin-films and multilayers (2017)
Journal Article
Azzawi, S., Hindmarch, A., & Atkinson, D. (2017). Magnetic damping phenomena in ferromagnetic thin-films and multilayers. Journal of Physics D: Applied Physics, 50(47), Article 473001. https://doi.org/10.1088/1361-6463/aa8dad

Damped ferromagnetic precession is an important mechanism underpinning the magnetisation processes in ferromagnetic materials. In thin-film ferromagnets and ferromagnetic/non-magnetic multilayers, the role of precession and damping can be critical fo... Read More about Magnetic damping phenomena in ferromagnetic thin-films and multilayers.

The role of mesoscopic structuring on the intermixing of spin-polarised conduction channels in thin-film ferromagnets for spintronics (2017)
Journal Article
Alcer, D., & Atkinson, D. (2017). The role of mesoscopic structuring on the intermixing of spin-polarised conduction channels in thin-film ferromagnets for spintronics. Nanotechnology, 28(37), Article 375703. https://doi.org/10.1088/1361-6528/aa7dcb

The separation of spin-up and spin-down conduction channels is fundamental to electronic transport in ferromagnets and essential for spintronic functionality. The spin states available for conduction are defined by the ferromagnetic material, but add... Read More about The role of mesoscopic structuring on the intermixing of spin-polarised conduction channels in thin-film ferromagnets for spintronics.

Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires (2017)
Journal Article
Brandão, J., Azzawi, S., Hindmarch, A., & Atkinson, D. (2017). Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires. Scientific Reports, 7(1), Article 4569. https://doi.org/10.1038/s41598-017-04088-8

Heavy metal layers, exemplified by Pt, are known to play a significant role in the magnetization behaviour of thin-film ferromagnets by three distinct mechanisms that can each contribute to the reversal process. These include modifying the local magn... Read More about Understanding the role of damping and Dzyaloshinskii-Moriya interaction on dynamic domain wall behaviour in platinum-ferromagnet nanowires.

Densification of a-IGZO with low-temperature annealing for flexible electronics applications (2017)
Journal Article
Troughton, J., Downs, P., Price, R., & Atkinson, D. (2017). Densification of a-IGZO with low-temperature annealing for flexible electronics applications. Applied Physics Letters, 110(1), Article 011903. https://doi.org/10.1063/1.4973629

Amorphous InGaZnO (a-IGZO) thin-film transistors are a leading contender for active channel materials in next generation flat panel displays and flexible electronics. Improved electronic functionality has been linked to the increased density of a-IGZ... Read More about Densification of a-IGZO with low-temperature annealing for flexible electronics applications.

Effective pinning energy landscape perturbations for propagating magnetic domain walls (2016)
Journal Article
Burn, D., & Atkinson, D. (2016). Effective pinning energy landscape perturbations for propagating magnetic domain walls. Scientific Reports, 6, Article 34517. https://doi.org/10.1038/srep34517

The interaction between a magnetic domain wall and a pinning site is explored in a planar nanowire using micromagnetics to reveal perturbations of the pinning energetics for propagating domain walls. Numerical simulations in the high damping ’quasi-s... Read More about Effective pinning energy landscape perturbations for propagating magnetic domain walls.

Controlling the stability of both the structure and velocity of domain walls in magnetic nanowires (2016)
Journal Article
Brandão, J., & Atkinson, D. (2016). Controlling the stability of both the structure and velocity of domain walls in magnetic nanowires. Applied Physics Letters, 109(6), Article 062405. https://doi.org/10.1063/1.4960201

For magnetic nanowire devices, the precise control of both domain wall (DW) motion and pinning behaviour is essential for reliable functional performance. The domain wall velocity and wall structure are typically sensitive to the driving field or spi... Read More about Controlling the stability of both the structure and velocity of domain walls in magnetic nanowires.

Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness (2016)
Journal Article
Azzawi, S., Ganguly, A., Tokaç, M., Rowan-Robinson, R., Sinha, J., Hindmarch, A., …Atkinson, D. (2016). Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness. Physical Review B, 93(5), Article 054402. https://doi.org/10.1103/physrevb.93.054402

The evolution of damping in Co/Pt, Co/Au, and Ni81Fe19/Pt bilayers was studied with increasing nonmagnetic (NM) heavy-metal layer thicknesses in the range 0.2nm≤tNM≤10nm, where tNM is the NM layer thickness. Magnetization precession was measured in t... Read More about Evolution of damping in ferromagnetic/nonmagnetic thin film bilayers as a function of nonmagnetic layer thickness.

Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures (2015)
Journal Article
Ganguly, A., Azzawi, S., Saha, S., King, J., Rowan-Robinson, R., Hindmarch, A., …Barman, A. (2015). Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures. Scientific Reports, 5, Article 17596. https://doi.org/10.1038/srep17596

Interface modification for control of ultrafast magnetic properties using low-dose focused ion beam irradiation is demonstrated for bilayers of two technologically important materials: Ni81Fe19 and Pt. Magnetization dynamics were studied using an all... Read More about Tunable Magnetization Dynamics in Interfacially Modified Ni81Fe19/Pt Bilayer Thin Film Microstructures.

Interfacial Contribution to Thickness Dependent in-plane Anisotropic Magnetoresistance (2015)
Journal Article
Tokaç, M., Wang, M., Jaiswal, S., Rushforth, A., Gallagher, B., Atkinson, D., & Hindmarch, A. (2015). Interfacial Contribution to Thickness Dependent in-plane Anisotropic Magnetoresistance. AIP Advances, 5(12), Article 127108. https://doi.org/10.1063/1.4937556

We have studied in-plane anisotropic magnetoresistance(AMR) in cobaltfilms with overlayers having designed electrically interface transparency. With an electrically opaque cobalt/overlayer interface, the AMR ratio is shown to vary in inverse proporti... Read More about Interfacial Contribution to Thickness Dependent in-plane Anisotropic Magnetoresistance.

Interfacial Structure Dependent Spin Mixing Conductance in Cobalt Thin Films (2015)
Journal Article
Tokaç, M., Bunyaev, S., Kakazei, G., Schmool, D., Atkinson, D., & Hindmarch, A. (2015). Interfacial Structure Dependent Spin Mixing Conductance in Cobalt Thin Films. Physical Review Letters, 115(5), Article 056601. https://doi.org/10.1103/physrevlett.115.056601

Enhancement of Gilbert damping in polycrystalline cobalt thin-film multilayers of various thicknesses, overlayered with copper or iridium, was studied in order to understand the role of local interface structure in spin pumping. X-ray diffraction ind... Read More about Interfacial Structure Dependent Spin Mixing Conductance in Cobalt Thin Films.

Tactile sensing in human–computer interfaces: The inclusion of pressure sensitivity as a third dimension of user input (2015)
Journal Article
Dempsey, S. J., Szablewski, M., & Atkinson, D. (2015). Tactile sensing in human–computer interfaces: The inclusion of pressure sensitivity as a third dimension of user input. Sensors and Actuators A: Physical, 232, 229-250. https://doi.org/10.1016/j.sna.2015.05.025

This paper presents a review of tactile technologies for human–computer interactivity via touch interfaces, where touch force is measured as a third dimension of user input along with touch location. Until recently, tactile technologies for computing... Read More about Tactile sensing in human–computer interfaces: The inclusion of pressure sensitivity as a third dimension of user input.

Precise control of interface anisotropy during deposition of Co/Pd multilayers (2014)
Journal Article
Barton, C., Slater, T., Rowan-Robinson, R., Haigh, S., Atkinson, D., & Thomson, T. (2014). Precise control of interface anisotropy during deposition of Co/Pd multilayers. Journal of Applied Physics, 116(16), Article 203903. https://doi.org/10.1063/1.4902826

We demonstrate the control of perpendicular magnetic anisotropy (PMA) in multilayer films without modification of either the microstructure or saturation magnetization by tuning the Ar+ ion energy using remote plasma sputtering. We show that for [Co/... Read More about Precise control of interface anisotropy during deposition of Co/Pd multilayers.

Control of domain wall pinning by localised focused Ga  + ion irradiation on Au capped NiFe nanowires (2014)
Journal Article
Burn, D., & Atkinson, D. (2014). Control of domain wall pinning by localised focused Ga  + ion irradiation on Au capped NiFe nanowires. Journal of Applied Physics, 116(20), Article 163901. https://doi.org/10.1063/1.4900437

Understanding domain wall pinning and propagation in nanowires are important for future spintronics and nanoparticle manipulation technologies. Here, the effects of microscopic local modification of the magnetic properties, induced by focused-ion-bea... Read More about Control of domain wall pinning by localised focused Ga  + ion irradiation on Au capped NiFe nanowires.

Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle (2014)
Journal Article
Ganguly, A., Rowan-Robinson, R., Haldar, A., Jaiswal, S., Sinha, J., Hindmarch, A., …Barman, A. (2014). Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle. Applied Physics Letters, 105(11), Article 112409. https://doi.org/10.1063/1.4896277

The effect of spin torque from the spin Hall effect in Pt/Ni81Fe19 rectangular bilayer film was investigated using time-resolved magneto-optical Kerr microscopy. Current flow through the stack resulted in a linear variation of effective damping up to... Read More about Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle.

Enhanced electron-magnon scattering in ferromagnetic thin films and the breakdown of the Mott two-current model (2014)
Journal Article
Rowan-Robinson, R., Hindmarch, A., & Atkinson, D. (2014). Enhanced electron-magnon scattering in ferromagnetic thin films and the breakdown of the Mott two-current model. Physical review B, 90(10), https://doi.org/10.1103/physrevb.90.104401

Electron-magnon spin-flip scattering in thin films was studied by investigating the thickness dependence of the anisotropic magnetoresistance (AMR) effect and spin-wave stiffness. The absolute resistivity change due to the AMR effect (Δρ) in Ni, Ni:V... Read More about Enhanced electron-magnon scattering in ferromagnetic thin films and the breakdown of the Mott two-current model.

Temperature Dependence of Electrical Transport in a Pressure-Sensitive Nanocomposite (2014)
Journal Article
Webb, A. J., Bloor, D., Szablewski, M., & Atkinson, D. (2014). Temperature Dependence of Electrical Transport in a Pressure-Sensitive Nanocomposite. ACS Applied Materials and Interfaces, 6(15), 12573-12580. https://doi.org/10.1021/am502515u

Printed nanocomposites are of significant application potential in numerous technologies, such as touch-sensitive sensors and surfaces. Here, temperature dependent electrical transport measurements were undertaken on a recently developed screen-print... Read More about Temperature Dependence of Electrical Transport in a Pressure-Sensitive Nanocomposite.

Local control of magnetic damping in ferromagnetic/non-magnetic bilayers by interfacial intermixing induced by focused ion-beam irradiation (2014)
Journal Article
King, J., Ganguly, A., Burn, D., Pal, S., Sallabank, E., Hase, T., …Atkinson, D. (2014). Local control of magnetic damping in ferromagnetic/non-magnetic bilayers by interfacial intermixing induced by focused ion-beam irradiation. Applied Physics Letters, 104(24), Article 242410. https://doi.org/10.1063/1.4883860

The influence of interfacial intermixing on the picosecond magnetization dynamics of ferromagnetic/non-magnetic thin-film bilayers was studied. Low-dose focused-ion-beam irradiation was used to induce intermixing across the interface between a 10 nm... Read More about Local control of magnetic damping in ferromagnetic/non-magnetic bilayers by interfacial intermixing induced by focused ion-beam irradiation.

Focused-ion-beam induced interfacial intermixing of magnetic bilayers for nanoscale control of magnetic properties (2014)
Journal Article
Burn, D., Hase, T., & Atkinson, D. (2014). Focused-ion-beam induced interfacial intermixing of magnetic bilayers for nanoscale control of magnetic properties. Journal of Physics: Condensed Matter, 26(23), Article 236002. https://doi.org/10.1088/0953-8984/26/23/236002

Modification of the magnetic properties in a thin-film ferromagnetic/non-magnetic bilayer system by low-dose focused ion-beam (FIB) induced intermixing is demonstrated. The highly localized capability of FIB may be used to locally control magnetic be... Read More about Focused-ion-beam induced interfacial intermixing of magnetic bilayers for nanoscale control of magnetic properties.

Characterisation of Charge Conduction Networks in Poly(3-hexylthiophene)/Polystyrene Blends using Noise Spectroscopy (2014)
Journal Article
Williams, A., Farrar, P., Gallant, A., Atkinson, D., & Groves, C. (2014). Characterisation of Charge Conduction Networks in Poly(3-hexylthiophene)/Polystyrene Blends using Noise Spectroscopy. Journal of Materials Chemistry C Materials for optical and electronic devices, 2(9), 1742-1748. https://doi.org/10.1039/c3tc31849d

1/f noise spectroscopy is used to investigate charge conduction networks within polymer blend space-charge-limited diodes (SCLDs) fabricated from regioregular poly(3-hexylthiophene) (P3HT) and either isotactic-polystyrene (i-PS) or amorphous-polystyr... Read More about Characterisation of Charge Conduction Networks in Poly(3-hexylthiophene)/Polystyrene Blends using Noise Spectroscopy.