Search Results - "Chapman, J.N"

Growth of GaN by metal organic vapor phase epitaxy on ZnO-buffered c-sapphire substrates by Ougazzaden, A., Rogers, D.J., Hosseini Teherani, F., Moudakir, T., Gautier, S., Aggerstam, T., Ould Saad, S., Martin, J., Djebbour, Z., Durand, O., Garry, G., Lusson, A., McGrouther, D., Chapman, J.N.

“…The materials quality and availability of large-area bulk GaN substrates is currently considered a key problem for the continuing development of improved…”
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Domain structures and switching mechanisms in patterned magnetic elements by Schrefl, Thomas, Fidler, Josef, Kirk, K.J., Chapman, J.N.

“…Domain formation and magnetisation reversal in lithographically fabricated magnetic elements 100–300 nm wide and 1.5–4.0 μm long have been investigated using…”
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Transitions Between Vortex and Transverse Walls in NiFe Nano-Structures by Bance, S., Schrefl, T., Hrkac, G., Suess, D., Brownlie, C., McVitie, S., Chapman, J.N., Allwood, D.A.

“…This paper investigates the possible transitions between transverse and vortex type domain walls in magnetic domain wall trap memory elements, induced by a…”
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MFM imaging of patterned permalloy elements under an external applied field by Garcı́a, J.M., Thiaville, A., Miltat, J., Kirk, K.J., Chapman, J.N.

“…The magnetization process of micron-sized permalloy elements submitted to in-plane magnetic fields is analyzed by means of magnetic force microscopy (MFM)…”
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Micromagnetic calculation of bias field and coercivity of polycrystalline ferromagnetic/antiferromagnetic layers by Kirschner, M., Suess, D., Schrefl, T., Fidler, J., Chapman, J.N.

“…Domain processes associated with exchange bias in ferromagnetic /antiferromagnetic layers are investigated using a micromagnetic approach. The model gives…”
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Lorentz microscopy analysis of arrays of rhombic elements by Kundrotaite, A., Chapman, J.N., Rahman, M.

“…The magnetic switching behavior of rhombic elements has been studied as a function of applied field, temperature, and array spacing. The mean switching field…”
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The fabrication and magnetic properties of acicular magnetic nano-elements by Ruhrig, M., Khamsehpour, B., Kirk, K.J., Chapman, J.N., Aitchison, P., McVitie, S., Wilkinson, C.D.W.

“…Two different lithographic techniques have been developed for fabricating magnetic nano-elements on ultra-thin electron-transparent substrates thereby allowing…”
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Modified differential phase contrast Lorentz microscopy for improved imaging of magnetic structures by Chapman, J.N., McFadyen, I.R., McVitie, S.

“…A modification to the differential phase contrast mode of Lorentz microscopy is proposed in which an annular quadrant detector is used instead of the standard…”
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A comparison of the micromagnetic and microstructural properties of four NdFeB-type materials processed by the HDDR route by Thompson, P., Gutfleisch, O., Chapman, J.N., Harris, I.R.

“…Transmission electron microscopy has been used to study the physical and magnetic microstructures of thinned sections of four different NdFeB-type alloys…”
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Computational and experimental micromagnetics of arrays of 2-D platelets by Ridley, P.H.W., Roberts, G.W., Chantrell, R.W., Kirk, K.J., Chapman, J.N.

“…2-D regular nanoelements are of interest as micromagnetic model systems and in a number of sensor applications. In this paper we concentrate on a recent…”
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Use of ZnO thin films as sacrificial templates for metal organic vapor phase epitaxy and chemical lift-off of GaN by Rogers, D. J., Hosseini Teherani, F., Ougazzaden, A., Gautier, S., Divay, L., Lusson, A., Durand, O., Wyczisk, F., Garry, G., Monteiro, T., Correira, M. R., Peres, M., Neves, A., McGrouther, D., Chapman, J. N., Razeghi, M.

“…Continued development of GaN-based light emitting diodes is being hampered by constraints imposed by current non-native substrates. ZnO is a promising…”
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Micromagnetic characteristics of single layer permalloy films in the nanometre range by Gillies, M.F., Chapman, J.N., Kools, J.C.S.

“…The micromagnetic properties of thin (5–20 nm) permalloy films, prepared by UHV magnetron sputtering, have been studied by Lorentz microscopy. Using the high…”
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Amorphous melt spun ribbons and sputtered thin films — investigation of the magnetic domain structures by TEM by Heyderman, L.J., Chapman, J.N., Gibbs, M.R.J., Shearwood, C.

“…The magnetic structures and magnetisation reversal in thinned melt spun ribbons and sputtered amorphous thin films of Metglas 2605SC (Fe81B13.5Si3.5C2) have…”
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Microstructure of precipitates and magnetic domain structure in an annealed Co38Ni33Al29 shape memory alloy by Bartova, B., Wiese, N., Schryvers, D., Chapman, J.N., Ignacova, S.

“…The microstructure of a Co38Ni33Al29 ferromagnetic shape memory alloy was determined by conventional transmission electron microscopy (TEM), electron…”
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Nanopatterning of a thin ferromagnetic CoFe film by focused-ion-beam irradiation by McGrouther, D., Chapman, J. N.

“…High-resolution magnetic patterning of a thin CoFe layer has been performed by irradiation using a focused-ion-beam system. Features <50nm wide were formed…”
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Microstructure of precipitates and magnetic domain structure in an annealed Co 38 Ni 33 Al 29 shape memory alloy by Bartova, B., Wiese, N., Schryvers, D., Chapman, J.N., Ignacova, S.

“…The microstructure of a Co 38 Ni 33 Al 29 ferromagnetic shape memory alloy was determined by conventional transmission electron microscopy (TEM), electron…”
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Determination of local composition in Co-Cr films deposited at different substrate temperatures by Rogers, D.J., Chapman, J.N., Bernards, J.P.C., Luitjens, S.B.

“…Thin Co-Cr films deposited on polyester substrates at different temperatures have been investigated by high-spatial-resolution X-ray microanalysis. Films…”
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Core–shell GaN–ZnO moth-eye nanostructure arrays grown on a-SiO2/Si (111) as a basis for improved InGaN-based photovoltaics and LEDs by Rogers, D.J., Sandana, V.E., Gautier, S., Moudakir, T., Abid, M., Ougazzaden, A., Teherani, F. Hosseini, Bove, P., Molinari, M., Troyon, M., Peres, M., Soares, Manuel J., Neves, A.J., Monteiro, T., McGrouther, D., Chapman, J.N., Drouhin, H.-J., McClintock, R., Razeghi, M.

“…•Non-polar moth-eye GaN was grown by MOVPE on ZnO nanoarray template on Si (111).•ZnO lattice matches to higher indium content InGaN required for PV or green…”
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Transmission electron microscopies of magnetic microstructures by Chapman, J.N, Scheinfein, M.R

“…Since its introduction 40 years ago Lorentz microscopy has been used extensively to study domain structures in magnetic thin films and elements. Here we review…”
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The direct determination of magnetic domain wall profiles by differential phase contrast electron microscopy by Chapman, J N, Batson, P E, Waddell, E M, Ferrier, R P

“…A new technique for the quantitative investigation of magnetic structures in ferromagnetic thin films is proposed. Unlike previous techniques the detected…”
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