Browsing by Author "Bland, J. A. C."

Article

Digital magnetic tagging for multiplexed suspension-based biochemical assays

Mitrelias, Thanos; Trypiniotis, Theodossis; Palfreyman, J. J.; Hong, B.; Vyas, K.; Hayward, T. J.; Llandro, J.; Kopper, K. P.; Bland, J. A. C.; Robertson, P. A.; Barnes, C. H. W. (2009)

Microarrays and suspension (or bead)-based technologies have attracted significant interest for their broad applications in high throughput molecular biology. However, the throughput of microarrays will always be limited ...

Article

Efficient spin detection across the hybrid Co/GaAs schottky interface

Trypiniotis, Theodossis; Tse, D. H. Y.; Steinmuller, S. J.; Cho, W. S.; Bland, J. A. C. (2007)

The electron spin detection efficiency was studied across Co/GaAs structures using photoexcitation techniques. Two sets of samples were prepared where the substrate surface was pretreated by annealing prior to growth for ...

Article

Electrical determination of the spin relaxation time of photoexcited electrons in GaAs

Kurebayashi, H.; Trypiniotis, Theodossis; Lee, K.; Easton, S.; Ionescu, A.; Farrer, I.; Ritchie, D. A.; Bland, J. A. C.; Barnes, C. H. W. (2010)

Spin-dependent transport for photoexcited electrons in an epitaxial Fe/GaAs interface was characterized from 5 to 300 K. The presence of spin-dependent transport was confirmed at all the measured temperatures and the spin ...

Article

Electron spin filtering in ferromagnet/semiconductor heterostructures

Bland, J. A. C.; Steinmuller, S. J.; Hirohata, A.; Cho, W. S.; Xu, Y. B.; Guertler, C. M.; Wastlbauer, G.; Ionescu, A.; Trypiniotis, Theodossis; Holmes, S. N. (2003)

Circularly polarized light was used to generate spin-polarized electrons at room temperature in ferromagnet (FM)/GaAs Schottky diode structures. A change in the helicity-dependent photocurrent was obtained when the ...

Conference Object

High throughput biological analysis using multi-bit magnetic digital planar tags

Hong, B.; Jeong, J. -R; Llandro, J.; Hayward, T. J.; Ionescu, A.; Trypiniotis, Theodossis; Mitrelias, Thanos; Kopper, K. P.; Steinmuller, S. J.; Bland, J. A. C. (2008)

We report a new magnetic labelling technology for high-throughput biomolecular identification and DNA sequencing. Planar multi-bit magnetic tags have been designed and fabricated, which comprise a magnetic barcode formed ...

Article

Highly efficient spin filtering of ballistic electrons

Steinmuller, S. J.; Trypiniotis, Theodossis; Cho, W. S.; Hirohata, A.; Lew, W. S.; Vaz, C. A. F.; Bland, J. A. C. (2004)

Spin dependent electron transport in hybrid Au/Co/Cu/NiFe/n-GaAs spin valve Schottky barrier structures was investigated using photoexcitation at various wavelengths. For excitation with the photon energy well above the ...

Conference Object

Highly efficient spin filtering of ballistic electrons in hybrid spin valve/semiconductor structures

Steinmuller, S. J.; Trypiniotis, Theodossis; Hirohata, A.; Cho, W. S.; Lew, W. S.; Vaz, C. A. F.; Bland, J. A. C. (2004)

The highly efficient spin filtering of ballistic electrons in hybrid spin valve/semiconductor (SC) structures was discussed. It was found that the photocurrent was dependent on the relative alignment of the light helicity ...

Article

Initial/final state selection of the spin polarization in electron tunneling across an epitaxial FeGaAs (001) interface

Kurebayashi, H.; Steinmuller, S. J.; Laloë, J. B.; Trypiniotis, Theodossis; Easton, S.; Ionescu, A.; Yates, J. R.; Bland, J. A. C. (2007)

Spin dependent electron transport across epitaxial FeGaAs (001) interfaces has been investigated using photoexcitation techniques. Spin filtering is observed in the forward bias regime and its sign is switched by using ...

Article

Localized magnetic fields in arbitrary directions using patterned nanomagnets

McNeil, R. P. G.; Schneble, R. J.; Kataoka, M.; Ford, C. J. B.; Kasama, T.; Dunin-Borkowski, R. E.; Feinberg, J. M.; Harrison, R. J.; Barnes, C. H. W.; Tse, D. H. Y.; Trypiniotis, Theodossis; Bland, J. A. C.; Anderson, D.; Jones, G. A. C.; Pepper, M. (2010)

Control of the local magnetic fields desirable for spintronics and quantum information technology is not well developed. Existing methods produce either moderately small local fields or one field orientation. We present ...

Article

Magnetic and structural properties of stoichiometric thin Fe 3Si/GaAs(0 0 1) films

Ionescu, A.; Vaz, C. A. F.; Trypiniotis, Theodossis; Gürtler, C. M.; Vickers, M. E.; García-Miquel, H.; Bland, J. A. C. (2005)

In this study, we report experimental results on the structural and magnetic properties of epitaxial Fe3Si films grown on GaAs(0 0 1) by co-evaporation. X-ray reflectivity shows that relatively smooth interfaces are obtained ...

Article

Magnetic properties of Fe/AlO x/GaAs(001) structures

Vaz, C. A. F.; Ionescu, A.; Trypiniotis, Theodossis; Bland, J. A. C.; Dalgliesh, R. M.; Langridge, S. (2005)

We report results on the effect of the Al Ox barrier layer on the magnetic moment of Fe using polarized neutron reflection. The sample has nominal composition 25 nm Au5 nm Fe1.3 nm Al Ox GaAs (001). The metal deposition ...

Article

Numerical calculation model for spin-dependent transport of photoexcited electrons across Fe/GaAs(0 0 1) interfaces

Kurebayashi, H.; Trypiniotis, Theodossis; Lee, K.; Moutafis, C.; Easton, S.; Ionescu, A.; Bland, J. A. C.; Barnes, C. H. W. (2010)

abs Spin-dependent transport of photogenerated electrons across Fe/GaAs(0 0 1) interfaces is calculated using a one-dimensional electron transport model. Creation of spin-polarized electrons by photoexcitation in this model ...

Article

Rewritable remote encoding and decoding of miniature multi-bit magnetic tags for high-throughput biological analysis

Jeong, J. -R; Llandro, J.; Hong, B.; Hayward, T. J.; Mitrelias, Thanos; Kopper, K. P.; Trypiniotis, Theodossis; Steinmuller, S. J.; Simpson, G. K.; Bland, J. A. C. (2008)

We have investigated a new magnetic labelling technology for high-throughput biomolecular identification and DNA sequencing. Planar multi-bit magnetic tags comprising a magnetic barcode formed by an ensemble of micron-sized ...

Article

Spin polarization control through resonant states in an Fe/GaAs Schottky barrier

Honda, S.; Itoh, H.; Inoue, J.; Kurebayashi, H.; Trypiniotis, Theodossis; Barnes, C. H. W.; Hirohata, A.; Bland, J. A. C. (2008)

Spin polarization of the tunnel conductivity has been studied for Fe/GaAs junctions with Schottky barriers. It is shown that band matching of resonant interface states within the Schottky barrier defines the sign of spin ...

Article

Static and dynamic magnetic properties of Ni80 Fe20 square antidot arrays

Tse, D. H. Y.; Steinmuller, S. J.; Trypiniotis, Theodossis; Anderson, D.; Jones, G. A. C.; Bland, J. A. C.; Barnes, C. H. W. (2009)

We have investigated both static and dynamic magnetic properties of square antidot arrays in a ferromagnetic thin-film structure of Au (2 nm)/ Ni80 Fe20 (27.6 nm) on a SiO2 500 nm/Si substrate using magneto-optic Kerr ...

Article

Structural, magnetic, electronic, and spin transport properties of epitaxial Fe 3Si/GaAs(001)

Ionescu, A.; Vaz, C. A. F.; Trypiniotis, Theodossis; Gürtler, C. M.; García-Miquel, H.; Bland, J. A. C.; Vickers, M. E.; Dalgliesh, R. M.; Langridge, S.; Bugoslavsky, Y.; Miyoshi, Y.; Cohen, L. F.; Ziebeck, K. R. A. (2005)

We report experimental results on the structural, magnetic, electronic, and spin transport properties of a 21 nm Fe 3Si/GaAs(001) heterostructure epitaxially grown by coevaporation. High-resolution x-ray diffraction shows ...

Conference Object

Towards magnetic suspension assay technology

Hayward, T. J.; Llandro, J.; Kopper, K. P.; Trypiniotis, Theodossis; Mitrelias, Thanos; Bland, J. A. C.; Barnes, C. H. W. (2008)

In this study micromagnetic simulations are used to evaluate two novel approaches of magnetically tagging biomolecules in high-throughput biological assays. Comparisons are made between a simple magnetic moment-based tagging ...