Accession Number : ADP013346


Title :   Off Axis Growth of Strontium Titanate Films with High Dielectric Constant Tuning and Low Loss


Descriptive Note : Conference proceedings


Corporate Author : COLORADO UNIV AT BOULDER DEPT OF PHYSICS


Personal Author(s) : Kampangkeaw, Satreerat ; Rogers, Charles T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/p013346.pdf


Report Date : 03 Apr 2003


Pagination or Media Count : 6


Abstract : We have measured the nonlinear dielectric properties of strontium titanate (STO) thin films grown on neodymium gallate (NGO) and lanthanum aluminate (LAO) substrates. The films prepared by off-axis pulsed laser deposition were characterized by their dielectric constant and loss tangent at 1 MHz and 2 GHz, and from room temperature down to 4 K. The resulting films show significant variations of dielectric properties with position of the substrates with respect to the plume axis. STO films on LAO substrates show low loss and high dielectric constant in regions near the plume axis. On the other hand, STO on NGO shows this effect only on the films grown far from the plume axis. We also obtained a figure of merit from the relative variation of the dielectric constant divided by the loss tangent in the presence of a DC electric field up to +/- 4 V/micrometers. Careful mapping of the plume crossection allowed us to improve the quality and reproducibility of the dielectric films, obtaining a best figure of merit at 2 GHz and 4 K close to 100 for NGO substrate but only well off axis.


Descriptors :   *THIN FILMS , *DIELECTRIC PROPERTIES , *LOW LOSS , *TUNING , *STRONTIUM , *TITANATES , SYMPOSIA , EPITAXIAL GROWTH , ELECTRIC FIELDS , SUBSTRATES , MICROWAVE EQUIPMENT , PULSED LASERS , DIELECTRIC FILMS , ROOM TEMPERATURE , DEPOSITION , NONLINEAR SYSTEMS , TANGENTS , PLUMES , NEODYMIUM , DIRECT CURRENT , RADIOFREQUENCY , REPRODUCIBILITY , LANTHANUM , FIGURE OF MERIT , ALUMINATES , PHASE SHIFT CIRCUITS , GALLATES , VARACTOR DIODES


Subject Categories : Physical Chemistry
      Electricity and Magnetism
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE