Comparison of Bi3Fe5O12 film giant Faraday rotators grown on (111) and (001) Gd3Ga5O12 single crystals
2006 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 515, no 2, 477-480 p.Article in journal (Refereed) Published
Bismuth iron garnet (Bi3Fe5O12, BIG) epitaxial thin films were grown on single crystal (Gd3Ga5O12, GGG) (111) and (001) substrates by rf-magnetron sputtering technique. Processing parameters have been optimized to obtain high deposition rate (2.74 mu m/h) and the surface rms roughness less than 10 nm. X-ray diffraction reveals films epitaxial quality: exclusive (111) or (00 1) orientation with narrow rocking curves and strong in-plane texture. Films possess low optical loss and magneto-optical Faraday rotation (FR) as high as 5 deg/mu m at 677 nm wavelength. Comparative analysis of films grown on (111) and (001) substrates clearly shows significant superiority of BIG/GGG(001) film. For this film, the coercive field similar to 100 Oe appears to be 2.5 times lower while the optical transmission to be 10% higher than that for BIG/GGG(111) film. Enhanced magneto-optical performance of BIG/GGG(001) films relies upon better accommodation of the film-to-substrate mismatch strain through the tetragonal BIG lattice distortions compared to the rhombohedral one in BIG/GGG(111) films.
Place, publisher, year, edition, pages
2006. Vol. 515, no 2, 477-480 p.
magnetooptical effects, theory, models, and numerical simulation, optical constants (refractive index, absorption), deposition by sputtering, ferrite and garnet devices, iron-garnet, rotation
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-16054DOI: 10.1016/j.tsf.2005.12.268ISI: 000241220600022ScopusID: 2-s2.0-33748757229OAI: oai:DiVA.org:kth-16054DiVA: diva2:334096
QC 20100525 QC 20110927. Conference: 12th International Conference on Thin Films. BRATISLAVA, SLOVAKIA. SEP 15-20, 20022010-08-052010-08-052011-09-29Bibliographically approved