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Microwave and magneto-optic properties of pulsed laser deposited bismuth iron garnet films
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0001-8774-9302
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
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2001 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 37, no 4, 2454-2456 p.Article in journal (Refereed) Published
Abstract [en]

 We report on processing and comparative characterization of epitaxial Bi3Fe5O12 (BIG) films grown by pulsed laser ablation of a precursor oxide target onto (NdGd)(3)(ScGa)(5)O-12 [NGSGG(111)] and Gd-3 (ScGa)(5)O-12 (GSGG(001)] single crystals. Comprehensive X-ray diffraction analyses reveal the epitaxial quality of the BIG films: they are single phase, exclusively (111) and (001) oriented with less than 0.4 degrees and 0.06 degrees of the full width at half maximum of the rocking curve of main texture Bragg reflection [(111) for NGSGG and (001) for GSGG substrate, respectively]. The films are strongly in-plane textured with cube-on-cube film-to-substrate epitaxial relationship. VSM and ferromagnetic resonance measurements revealed in-plane magnetization in BIG/GSGG(001) film, while the BIG/NGSGG(111) film was found to have perpendicular magnetization. For BIG(001) and (111) films the saturation magnetization 4 piM(s) was found to be 1400 and 1200 Gs; the Faraday rotation at 635 nm was -7.8 and -6.7 deg/mum; the constant of uniaxial magnetic anisotropy was K-u* = -8.70 X 10(4) and +1.16 x 10(4) erg/cm(3); the constant of cubic magnetic anisotropy K-1 = -3.6 x 10(3) and -7.14 x 10(3) erg/cm(3). High Faraday rotation and low coercive field (less than or equal to 40 Oe) of BIG/GSGG(001) films show promise for their use in integrated magneto-optic applications.

Place, publisher, year, edition, pages
2001. Vol. 37, no 4, 2454-2456 p.
Keyword [en]
bismuth iron garnet thin film, Faraday rotation, ferromagnetic resonance, magnetic anisotropy
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6463DOI: 10.1109/20.951201ISI: 000170910900375OAI: oai:DiVA.org:kth-6463DiVA: diva2:11184
Note
QC 20100922Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. On ferromagnetic thin films and two-dimensional magneto-optic photonic crystals
Open this publication in new window or tab >>On ferromagnetic thin films and two-dimensional magneto-optic photonic crystals
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis presents results in two different neighboring areas of research: the magnetic properties of thin ferrite films and the application of the films in two-dimensional photonic crystals.

In the first part, we investigate the accuracy of the customary method for determining the magnetic anisotropy constants of ferrite films by ferromagnetic resonance (FMR) experiment. We have improved the method and introduced an experimental procedure to obtain the anisotropy constants with higher precision. The magnetic anisotropy fields are obtained by using FMR on a (111)-oriented yttrium iron garnet (YIG) film made by pulsed laser deposition. Moreover, we found experimentally that the shapes of FMR spectra of laser deposited epitaxial YIG films strongly depend on the orientation of the magnetic bias field with respect to the crystalline axes of the film. Inhomogeneities of the constants of anisotropy throughout the film could be responsible for the complexity of the FMR spectra. We find the special directions of the applied magnetic field in which the contribution of the magnetocrystalline anisotropy has the smallest effect on the ferromagnetic resonance and therefore on the elements of the permeability tensor.

In the second part, we study the electromagnetic wave propagation in two-dimensional (2D) dielectric and magneto-optic photonic crystals (PCs). We have proposed a 2D PC which is composed of magneto-optic material for the purpose of the enhancement of Faraday rotation in high transmission. It is assumed that the 2D PC contains a bismuth iron garnet (BIG) film either as the PC background medium or as a defect, embedded in the 2D PC. We have examined theoretically and computationally the increase in the Faraday rotation as well as the transmission of a plane-polarized plane wave incident onto these structures in the optical wavelength regime. Several important phenomena, with potential applications, are observed.

Place, publisher, year, edition, pages
Kista: Mikroelektronik och informationsteknik, 2004
Series
TRITA-MVT, ISSN 0348-4467 ; 2004:6
Keyword
Physics, photonic crystals, physics, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-42 (URN)
Public defence
2004-11-12, C1, Electrum, Kista, 13:00
Opponent
Supervisors
Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2016-11-24

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Khartsev, Sergey

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