TITLE

Microwave properties of compositionally graded (Ba, Sr)TiO[sub 3] thin films according to the direction of the composition gradient for tunable microwave applications

AUTHOR(S)
Lee, Su-Jae; Moon, Seung Eon; Ryu, Han-Cheol; Kwak, Min-Hwan; Kim, Young-Tae; Han, Seok-Kil
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/31/2003, Vol. 82 Issue 13, p2133
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Compositionally graded (Ba[SUBx], Sr[SUB1-x]TiO[SUB3] (BST) thin films were deposited on MgO substrates by pulsed laser ablation. The microwave properties of the graded BST thin films were investigated at microwave frequencies with coplanar waveguide (CPW) meander-line phase shifters as a function of the direction of the composition gradient with respect to the substrate at room temperature. CPW phase shifters using graded BaTiO[SUB3](BT)→SrTiO[SUB3](ST) and ST→BT thin films exhibited a differential phase shift of 73° and 22° at 10 GHz with a dc bias voltage of 150 V, respectively. The figure of merit of the phase shifters at 10 GHz was 14.6 deg/dB for the graded BT→ST film, and 10 deg/dB for the graded ST→BT film. The graded BT→ST thin films showed a larger phase tuning than the ST!BT thin films. The microwave properties of the graded BST films depended strongly on the crystalline structure and the direction of the composition gradient with respect to the substrate.
ACCESSION #
9377411

 

Related Articles

  • In situ growth of PbSrYCaCuO films by laser ablation. Hughes, R.A.; Lu, Y.; Timusk, T.; Preston, J.S. // Applied Physics Letters;2/18/1991, Vol. 58 Issue 7, p762 

    Reports on the preparation of PbSrYCaCuO thin films by laser ablation. Growing of the films in situ at low substrate temperature; Starting composition of the target; Structural analysis; Characteristics of the films.

  • Island growth and surface topography of epitaxial Y-Ba-Cu-O thin films on MgO. Krebs, H.U.; Krauns, Ch.; Xiaoguang Yang; Geyer, Ulrich // Applied Physics Letters;10/21/1991, Vol. 59 Issue 17, p2180 

    Examines the island growth and surface morphology of epitaxial Y-Ba-Cu-O thin films on magnesium oxide substrate. Growth of films by krypton fluoride excimer laser ablation; Use of scanning electron and tunneling microscopies; Determination of the average film thickness.

  • Growth of 2H-SiC on 6H-SiC by pulsed laser ablation. Stan, M.A.; Patton, M.O. // Applied Physics Letters;5/16/1994, Vol. 64 Issue 20, p2667 

    Examines the growth of 2hexagonal-silicon carbide (2H-SiC) thin film on a 6H-SiC substrate by pulsed laser ablation. Occurrence of the 2H-SiC film deposition in a high vacuum system; Measurement of the lattice parameters using plan-view and cross-sectional transmission electron microscopy;...

  • Superconducting epitaxial (Tl,Bi)Sr[sub 1.6]Ba[sub 0.4]Ca[sub 2]Cu[sub 3]O[sub 9-delta] film.... Ren, Z.F.; Wang, C.A. // Applied Physics Letters;7/11/1994, Vol. 65 Issue 2, p237 

    Synthesizes high quality 1 micrometer thick (TI,Bi)Sr[sub 1.6]Ba[sub 0.4]Ca[sub 2]Cu[sub 3]O[sub 9-] thin films. Deposition of the prefilm on the (100) surface of LaAlO[sub 3] by laser ablation; Exhibition of glossy films; Existence of 1223 phase with nearly perfect c-axis alignment;...

  • Thin-film deposition by a new laser ablation and plasma hybrid technique. Krishnaswamy, J.; Rengan, A.; Narayan, J.; Vedam, K.; McHargue, C. J. // Applied Physics Letters;6/12/1989, Vol. 54 Issue 24, p2455 

    We have developed a new laser ablation and plasma hybrid technique for depositing thin diamond-like carbon (DLC) films on Si<100> substrates at room temperature and at 110 °C with improved optical and mechanical properties. The technique involves coupling of laser energy (λ=0.308 μm,...

  • Li deficiencies in LiNbO3 films prepared by pulsed laser deposition in a buffer gas. Gonzalo, J.; Afonso, C.N. // Journal of Applied Physics;9/15/1997, Vol. 82 Issue 6, p3129 

    Investigates the origin of lithium deficiency in films grown by laser ablation of single-crystal LiNbO3 targets in a buffer gas. Influence of the target-substrate distance; Nature of the buffer gas and substrate configuration on the stoichiometry of films; Dynamics of plasma; Role of collisional...

  • Nd[sub 0.8]Y[sub 0.2]NiO[sub 3] thin films with room-temperature metal–insulator transition deposited by pulsed laser ablation. Hamet, Jean-François; Ambrosini, Andrea; Retoux, Richard // Journal of Applied Physics;5/1/2003, Vol. 93 Issue 9, p5136 

    A solid solution between neodymium and yttrium nickelates has been stabilized that displays a room-temperature metal–insulator transition and lattice parameters predicted by Vegard’s law. Nd[sub 0.8]Y[sub 0.2]NiO[sub 3] thin films were grown on (110) NdGaO[sub 3] by pulsed laser...

  • A parametric study of the phase formation of in situ BiSrCaCuO thin films by laser ablation. Lin, Wen-Tai; Chen, Yung-Fu; Kao, Chih-Chang; Wu, Kuo-Chung // Journal of Applied Physics;12/1/1993, Vol. 74 Issue 11, p6767 

    Presents a parametric study of the phase formation of in situ BiSrCaCuO thin films by laser ablation. Experimental procedures for the preparation of the films; Analysis of the oxygen partial pressure-substrate temperature phase diagrams of the films grown by laser ablation; Summary of the...

  • Two-dimensional growth model for laser-ablated Ag-doped YBa2Cu3O7-x thin films. Kumar, Dhananjay; Apte, P. R.; Pinto, R. // Journal of Applied Physics;6/1/1995, Vol. 77 Issue 11, p5802 

    Presents a study which discussed the growth of silver (Ag)-doped YBa[sub2]Cu[sub3]O[sub7-x] thin films by the laser ablation technique. Possible causes of grain-boundary resistance to the current flow; Information on the Ag doping of high-temperature superconductors in bulk form; Effect of film...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics