Spectral dependences of Faraday rotation in Y&amp;lt;inf&amp;gt;3-x&amp;lt;/inf&amp;gt;Bi&amp;lt;inf&amp;gt;x&amp;lt;/inf&amp;gt;Fe&amp;lt;inf&amp;gt;5&amp;lt;/inf&amp;gt;O&amp;lt;inf&amp;gt;12&amp;lt;/inf&amp;gt;LPE films

Šimša, Z.; Gall, H. Le; Šimšová, J.; Koláček, Jan; Paillier-Malécot, A. Le

doi:10.1109/tmag.1984.1063288

Cited by 20 publications

(3 citation statements)

References 7 publications

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“…Films with perpendicular anisotropy exhibit a bubble or labyrinth-like domain structure with domain sizes in the range of 4-50 µm (Polyanskii et al 1989, Indenbom et al 1990. At λ = 426 nm specific Faraday rotations parallel to the magnetization vector up to 4 • µm −1 in Y 3−x Bi x Fe 5 O 12 are obtained at room temperature (Simsa et al 1984), which depend strongly on the Bi content. If the polarized light beam is propagating parallel or antiparallel to M , the Faraday rotation has different signs in different domains.…”

Section: Faraday Effectmentioning

confidence: 99%

“…These garnets are grown by liquid phase epitaxy and exhibit magnetic ordering below T c = 400-600 K with a spontaneous magnetization vector normal to the film plane. Below their point of compensation T k < T c , large Faraday rotations parallel to the magnetization vector are obtained (up to 4 • µm −1 in Y 3−x Bi x Fe 5 O 12 at room temperature and λ = 426 nm (Simsa et al 1984)) which depend strongly on the Bi content. In the temperature region of superconductivity T < 150 K, the Faraday rotation is nearly temperature independent.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-optical studies of current distributions in high-T_csuperconductors

et al. 2002

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In the past few years magneto-optical flux imaging (MOI) has come to take an increasing role in the investigation and understanding of critical current densities in high-T c superconductors (HTS). This has been related to the significant progress in quantitative high-resolution magnetooptical imaging of flux distributions together with the model-independent determination of the corresponding current distributions. We review in this article the magneto-optical imaging technique and experiments on thin films, single crystals, polycrystalline bulk ceramics, tapes and melt-textured HTS materials and analyse systematically the properties determining the spatial distribution and the magnitude of the supercurrents. First of all, the current distribution is determined by the sample geometry. Due to the boundary conditions at the sample borders, the current distribution in samples of arbitrary shape splits up into domains of nearly uniform parallel current flow which are separated by current domain boundaries, where the current streamlines are sharply bent. Qualitatively, the current pattern is described by the Bean model; however, changes due to a spatially dependent electric field distribution which is induced by flux creep or flux flow have to be taken into account. For small magnetic fields, the Meissner phase coexists with pinned vortex phases and the geometry-dependent Meissner screening currents contribute to the observed current patterns. The influence of additional factors on the current domain patterns are systematically analysed: local magnetic field dependence of j c (B), current anisotropy, inhomogeneities and local transport properties of grain boundaries. We then continue to an overview of the current distribution and current-limiting factors of materials, relevant to technical applications like melt-textured samples, coated conductors and tapes. Finally, a selection of magneto-optical experiments which give direct insight into vortex pinning and depinning mechanisms are reviewed.

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Section: Faraday Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magneto-optical studies of current distributions in high-T_csuperconductors

et al. 2002

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“…As far as the MO properties of insulators are concerned, we have to emphasize the large enhancement of the Faraday rotation of the bismuth-substituted yttrium iron garnet (Bi:YIG). Because this giant effect is unambiguously associated with the presence of the diamagnetic Bi 3+ ion, which has a large spin-orbit coupling constant, an appreciable number of works exist where the amazing behaviour is attributed to an increase of the spin-orbit coupling of Fe 3+ ions resulting from the formation of a molecular orbital (mixing of the 3d Fe 3+ orbital with the 6p Bi 3+ one through 2p orbitals of the O 2− ions) (Kahn et al 1969, Scott et al 1975, Shinagawa 1982, Simsa et al 1984. More recently, Dionne andAllen (1993, 1994) have proposed that a large excited-state splitting induced by the large bismuth spin-orbit coupling is responsible for the Faraday rotation enhancement.…”

Section: Introductionmentioning

confidence: 99%

The effect of the spin-orbit interaction strengths on the Faraday rotation in Pr-substituted yttrium iron garnet and in praseodymium trifluoride

Yang

Guillot

1999

J. Phys.: Condens. Matter

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The effect of the spin-orbit interaction of both the ground and excited configurations on the Faraday rotation of the trivalent Pr ion in praseodymium-substituted yttrium iron garnet and praseodymium trifluoride is analysed. It is found that the influence of the spin-orbit coupling strength of the ground configuration on the Faraday rotation is large; however, the MO rotation does not scale linearly with the spin-orbit coupling. It is surprising that the influence of the spin-orbit coupling strength of the excited configuration on the Faraday rotation is small except when the light frequency is near an MO resonance frequency. It is demonstrated that the spin-orbit interactions of both the ground and excited configurations are not always needed to produce a net Faraday rotation. The underlying physical reasons for the differences between our theoretical results and those obtained by other authors and between the different results obtained for Pr:YIG and , respectively, are discussed.

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Preparation and Faraday rotation spectra of YIG:Pb, Pt garnet films

Šimša

Görnert

1989

Phys. Stat. Sol. (a)

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Yttrium iron garnet films are grown in six different flux melts with liquidus temperatures between 878 and 1054 °C. The remarkably different behaviour of the growth rate versus growth temperature is caused mainly by changes of the surface kinetic coefficient of atomically rough {111} faces. Optical absorption and the Faraday rotation are measured on the series of lead and platinum doped yttrium iron garnet films in the visible and near infrared region. While platinum influence can hardly be detected the lead influences many of the lines being already observed in the Faraday rotation spectrum of pure YIG.

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Spectral dependences of Faraday rotation in Y<inf>3-x</inf>Bi<inf>x</inf>Fe<inf>5</inf>O<inf>12</inf>LPE films

Cited by 20 publications

References 7 publications

Magneto-optical studies of current distributions in high-T_csuperconductors

Magneto-optical studies of current distributions in high-T_csuperconductors

The effect of the spin-orbit interaction strengths on the Faraday rotation in Pr-substituted yttrium iron garnet and in praseodymium trifluoride

Preparation and Faraday rotation spectra of YIG:Pb, Pt garnet films

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Spectral dependences of Faraday rotation in Y&lt;inf&gt;3-x&lt;/inf&gt;Bi&lt;inf&gt;x&lt;/inf&gt;Fe&lt;inf&gt;5&lt;/inf&gt;O&lt;inf&gt;12&lt;/inf&gt;LPE films

Cited by 20 publications

References 7 publications

Magneto-optical studies of current distributions in high-Tcsuperconductors

Magneto-optical studies of current distributions in high-Tcsuperconductors

The effect of the spin-orbit interaction strengths on the Faraday rotation in Pr-substituted yttrium iron garnet and in praseodymium trifluoride

Preparation and Faraday rotation spectra of YIG:Pb, Pt garnet films

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Product

Resources

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Spectral dependences of Faraday rotation in Y<inf>3-x</inf>Bi<inf>x</inf>Fe<inf>5</inf>O<inf>12</inf>LPE films

Magneto-optical studies of current distributions in high-T_csuperconductors

Magneto-optical studies of current distributions in high-T_csuperconductors