Search Results - "Gehring, G A"

Ferromagnetism above room temperature in bulk and transparent thin films of Mn-doped ZnO by Rao, K. V, Sharma, Parmanand, Gupta, Amita, Owens, Frank J, Sharma, Renu, Ahuja, Rajeev, Guillen, J. M. Osorio, Johansson, Börje, Gehring, G. A

“…The search for ferromagnetism above room temperature in dilute magnetic semiconductors has been intense in recent years. We report the first observations of…”
Get full text

Two magnetic regimes in doped ZnO corresponding to a dilute magnetic semiconductor and a dilute magnetic insulator by Behan, A J, Mokhtari, A, Blythe, H J, Score, D, Xu, X-H, Neal, J R, Fox, A M, Gehring, G A

“…Films of ZnO doped with magnetic ions Mn and Co and, in some cases, with Al have been fabricated with a very wide range of carrier densities. Ferromagnetic…”
Get full text

Room-temperature magneto-optics of ferromagnetic transition-metal-doped ZnO thin films by Neal, J R, Behan, A J, Ibrahim, R M, Blythe, H J, Ziese, M, Fox, A M, Gehring, G A

“…Magneto-optic studies of ZnO doped with transition metals Co, Mn, V, and Ti indicate a significant magnetic circular dichroism (MCD) at the ZnO band edge at…”
Get full text

Pressure-induced quantum phase transitions by Gehring, G. A

“…A quantum critical point is approached by applying pressure in a number of ferromagnetic and antiferromagnetic metals. The observed dependence of Tc on…”
Get full text

Enhancement of room temperature ferromagnetism of Fe-doped ZnO epitaxial thin films with Al co-doping by Chattopadhyay, S., Nath, T.K., Behan, A.J., Neal, J.R., Score, D., Feng, Q., Fox, A.M., Gehring, G.A.

“…Epitaxial films of ZnO doped with magnetic ion Fe and, in some cases, with 1% Al show clear evidence of room temperature ferromagnetic ordering. The Al doped…”
Get full text

Strong exciton–photon coupling in a low-Q all-metal mirror microcavity by Hobson, P. A., Barnes, W. L., Lidzey, D. G., Gehring, G. A., Whittaker, D. M., Skolnick, M. S., Walker, S.

“…We report the experimental observation of strong exciton–photon coupling in a planar microcavity composed of an organic semiconductor positioned between two…”
Get full text

The dopant concentration and annealing temperature dependence of ferromagnetism in Co-doped ZnO thin films by Xu, Xiao-Hong, Qin, Xiu-Fang, Jiang, Feng-Xian, Li, Xiao-Li, Chen, Ya, Gehring, G.A.

“…A series of Zn 1− x Co x O thin films with the atomic fraction, x, in the range of 0.03–0.10 were deposited on glass substrates at room temperature by…”
Get full text

Temperature dependent carrier induced ferromagnetism in Zn(Fe)O and Zn(FeAl)O thin films by Chattopadhyay, S., Nath, T.K., Behan, A.J., Neal, J.R., Score, D., Feng, Q., Fox, A.M., Gehring, G.A.

“…Epitaxial films of ZnO doped with magnetic ion Fe and, in some cases, with 1% Al show clear evidence of room temperature ferromagnetic ordering but containing…”
Get full text

Influence of Fe3O4 on metal–insulator transition temperature of La0.7Ca0.3MnO3 thin films by Guan, Xiaofen, Ma, Rongrong, Zhou, Guowei, Quan, Zhiyong, Gehring, G. A., Xu, Xiaohong

“…In this work, the magnetic and transport properties of La 0.7 Ca 0.3 MnO 3 (LCMO) films are compared with films capped with Fe 3 O 4 . The capping layers for…”
Get full text

Diffusive benefits of cylinders in front of a Schroeder diffuser by Pogson, M. A., Whittaker, D. M., Gehring, G. A., Cox, T. J., Hughes, R. J., Angus, J. A. S.

“…A numerical investigation is performed into the diffusive effects of cylinders positioned in front of a Schroeder diffuser. A regular line of cylinders is…”
Get full text

Magnetoresistance in Co/ZnO Films by Xiao-Li Li, Zhi-Yong Quan, Xiao-Hong Xu, Hai-Shun Wu, Gehring, G.A.

“…[Co(0.6 nm)/ZnO( x nm)] 60 ( x=0.3 - 3) films were deposited on glass substrates by magnetron sputtering, and then annealed in vacuum. The large negative…”
Get full text

A study of the optimization of parameters for pulsed laser deposition using Monte Carlo simulation by Xu, X.H., Zhang, R.Q., Dong, X.Z., Gehring, G.A.

“…In this paper, we have studied the pulsed laser deposition process of a submonolayer and several monolayers using the Monte Carlo approach. In this model, the…”
Get full text

The structure, optical and magnetic properties of arsenic implanted ZnO films prepared by molecular beam epitaxy by Ying, Minju, Wang, Shida, Duan, Tao, Liao, Bin, Zhang, Xu, Mei, Zengxia, Du, Xiaolong, Gerriu, F.M., Fox, A.M., Gehring, G.A.

“…Different concentrations of arsenic ions have been introduced into high quality O polar ZnO films prepared by rf-plasma assisted molecular beam epitaxy on…”
Get full text

Mechanical alloying: a route to room-temperature Ferromagnetism in bulk Zn1-xMnxO by Blythe, H.J., Ibrahim, R.M., Gehring, G.A., Neal, J.R., Fox, A.M.

“…High-purity commercial ZnO and MnO2 powders have been used as starting materials for the production of the compound Zn0.98Mn0.02O. The magnetic properties of…”
Get full text

Magneto-optical and transport studies of ZnO-based dilute magnetic semiconductors by Behan, A.J., Neal, J.R., Ibrahim, R.M., Mokhtari, A., Ziese, M., Blythe, H.J., Fox, A.M., Gehring, G.A.

“…Thin film samples of ZnO doped with V were grown on sapphire substrates by pulsed laser deposition (PLD). The magnetization was measured by SQUID magnetometry…”
Get full text

Ab initio charge, spin and orbital energy scales in LaMnO3 by Tyer, R, Temmerman, W. M, Szotek, Z, Banach, G, Svane, A, Petit, L, Gehring, G. A

“…The first-principles SIC-LSD theory is utilized to study electronic, magnetic and orbital phenomena in LaMnO3. The correct ground state is found, which is…”
Get full text

Detection of Escherichia coli O157:H7 using a surface plasmon resonance biosensor by Fratamico, P.M, Strobaugh, T.P, Medina, M.B, Gehring, A.G

“…The BIAcore biosensor was used to detect binding of Escherichia coli O157:H7 with specific antibodies. Immobilized Protein A or Protein G captured antibodies…”
Get full text

Carrier-induced ferromagnetism in n-type ZnMnAlO and ZnCoAlO thin films at room temperature by Xu, X H, Blythe, H J, Ziese, M, Behan, A J, Neal, J R, Mokhtari, A, Ibrahim, R M, Fox, A M, Gehring, G A

Get full text

Extrinsic and intrinsic origins of anisotropic magnetoresistance in doped YIG by Lehmann-Szweykowska, A., Wojciechowski, R. J., Gehring, G. A., Szamer, A., Wigen, P. E., Micnas, R.

“…A microscopic model of Ca:YIG minimal system in the form of a pair of the tetrahedral (d) iron–oxygen clusters, separated by the octahedral (a) cluster,…”
Get full text

The temperature dependence of the spin-wave damping in Co/CoO bilayers by Moradi, H., Gehring, G.A.

“…Brillouin light scattering spin wave studies show that the frequency and linewidth of ultrathin Co/CoO films are strongly dependent on the temperature, so that…”
Get full text