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Author Sakai, A. ♦ Kanno, T. ♦ Yotsuhashi, S. ♦ Odagawa, A. ♦ Adachi, H.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2005
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Anisotropic magnetoresistance ♦ Thermoelectricity ♦ Transistors ♦ Strontium ♦ Conductivity ♦ Sputtering ♦ Temperature ♦ Substrates ♦ Magnetic anisotropy ♦ Perpendicular magnetic anisotropy
Abstract We have investigated the control of crystal orientation in misfit layered cobaltite A/sub 3/Co/sub 4/O/sub 9/ (A=Ca, Sr) thin films and succeeded in growing epitaxial films with c-axis orientation perpendicular and parallel to the substrate surface by rf-planar magnetron sputtering. Anisotropic transport properties (parallel to the CoO/sub 2/ layers (/spl par/) and perpendicular to the CoO/sub 2/ layers (/spl perp/)) were measured using the epitaxial films with c-axis parallel to the film plane. The resistivity for Sr/sub 3/Co/sub 4/O/sub 9/ parallel to the CoO/sub 2/ layers (/spl rho//sub /spl par//) is about 2.5 m/spl Omega/ cm at room temperature while that perpendicular to the CoO/sub 2/ layers (/spl rho//sub /spl perp//) is about 150 m/spl Omega/ cm. Sr/sub 3/Co/sub 4/O/sub 9/ has lower parallel and perpendicular resistivity than Ca/sub 3/Co/sub 4/O/sub 9/. As for thermoelectric properties of Sr/sub 3/Co/sub 4/O/sub 9/, Seebeck coefficient parallel to the CoO/sub 2/ layers (S/sub /spl par//) is 90 /spl mu/V/K and that perpendicular to the CoO/sub 2/ layers (S/sub /spl perp//) is 30 /spl mu/V/K at room temperature. The power factor parallel to the CoO/sub 2/ layers is calculated to be 3/spl times/10/sup -4/ W/mK/sup 2/, about two times higher than that for Ca/sub 3/Co/sub 4/O/sub 9/. The anisotropic value of resistivity for Ca/sub 3/Co/sub 4/O/sub 9/ and Sr/sub 3/Co/sub 4/O/sub 9/ is about 40 and 60, respectively, and that of Seebeck Coefficient is similarly about 3.
Description Author affiliation: Adv. Technol. Res. Lab., Matsushita Electr. Ind. Co. Ltd., Kyoto, Japan (Sakai, A.; Kanno, T.; Yotsuhashi, S.; Odagawa, A.; Adachi, H.)
ISBN 0780395522
ISSN 10942734
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2005-06-19
Publisher Place USA
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 1.17 MB
Page Count 4
Starting Page 288
Ending Page 291

Source: IEEE Xplore Digital Library