Browsing by Author "Ionescu, A."

Now showing items 1-8 of 8

    • 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  

      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  

      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  

      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 ...