title: Terahertz dielectric response of ferroelectric Ba(x)Sr(1-x)TiO3 thin films.
abstract: Terahertz time-domain spectroscopy has been used to investigate the dielectric and optical properties of ferroelectric Ba(x)Sr(1-x)TiO(3) thin films for nominal x-values of 0.4, 0.6, and 0.8 in the frequency range of 0.3 to 2.5 THz. The ferroelectric thin films were deposited at approximately 700 nm thickness on [001] MgO substrate by pulsed laser deposition. The measured complex dielectric and optical constants were compared with the Cole-Cole relaxation model. The results show that the Cole-Cole relaxation model fits well with the data throughout the frequency range and the dielectric relaxation behavior of ferroelectric Ba(x)Sr(1-x)TiO(3) thin films varies with the films compositions. Among the compositions of Ba(x)Sr(1-x)TiO(3) films with different Ba/Sr ratios, Ba(0.6)Sr(0.4)TiO(3) has the highest dielectric constants and the shortest dielectric relaxation time.
authors.affiliation: IT Convergence & Components Laboratory, Electronics and Telecomunications Research Institute, Daejeon, Korea. sbkang71@etri.re.kr
authors.forename: Seung Beom
authors.initials: SB
authors.lastname: Kang
authors.forename: Min Hwan
authors.initials: MH
authors.lastname: Kwak
authors.forename: Muhan
authors.initials: M
authors.lastname: Choi
authors.forename: Sungil
authors.initials: S
authors.lastname: Kim
authors.forename: Taeyong
authors.initials: T
authors.lastname: Kim
authors.forename: Eun Jong
authors.initials: EJ
authors.lastname: Cha
authors.forename: Kwang Yong
authors.initials: KY
authors.lastname: Kang
mesh_terms: D001464:Barium / Q000737:chemistry* / Q000528:radiation effects; D004553:Electric Conductivity; D008422:Materials Testing; D008567:Membranes, Artificial; D011829:Radiation Dosage; D013324:Strontium / Q000737:chemistry* / Q000528:radiation effects; D055053:Terahertz Radiation; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D008567:Membranes, Artificial; C009495:titanium dioxide; D001464:Barium; D014025:Titanium; D013324:Strontium