Characterization and optimization of magnetic garnet films for magneto-optical visualization of magnetic field distributions

Klank, M.; Hagedorn, O.; Holthaus, C.; Shamonin, Mikhail; Dötsch, H.

doi:10.1016/s0963-8695(03)00012-4

Cited by 20 publications

(7 citation statements)

References 17 publications

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“…Bi-substituted garnets are expected to be used as spatial light modulators (SLMs), waveguide-type isolators, and MO indicators. [2][3][4][5][6][7] The MO effects in Bi:RIGs are enhanced with increasing Bi substitution due to the change in the spin-orbit interaction contributed to by the 6p orbital of Bi, [8][9][10] for example, Faraday rotation reaches 25°=µm around 530 nm in a fully Bi-substituted rare-earth iron garnet, Bi 3 Fe 5 O 12 (BIG). Therefore, garnets substituted with a large amount of Bi have been attracting attention as materials for MO applications.…”

Section: Introductionmentioning

confidence: 99%

Nd_0.5Bi_2.5Fe₅₋ _yGa_yO₁₂ thin films on Gd₃Ga₅O₁₂ substrates prepared by metal–organic decomposition

Sasaki

Lou

Liu

et al. 2016

Jpn. J. Appl. Phys.

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Highly Bi-substituted neodymium iron gallium garnet thin films with a Bi content of 2.5, Nd0.5Bi2.5Fe5− y Ga y O12 (NBIGG) with y = 0–1, on gadolinium gallium garnet (111) and (100) substrates have been prepared by metal–organic decomposition. Magnetic properties and magnetic anisotropy energies were measured using an alternating field gradient magnetometer and by magnetic torque measurement, respectively. Faraday rotation spectra and hysteresis loops were measured using a Faraday rotation spectrometer. The magnetization of NBIGG thin films exhibiting a large Faraday rotation of 10–15°/µm decreased with increasing Ga content, resulting in increased effective magnetic anisotropy energy K eff. The dependence of the magnetic anisotropies on the Ga content is discussed in terms of the reverse magnetostrictive effect caused by thermal stress as well as the magnetocrystalline and shape anisotropies.

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Section: Introductionmentioning

confidence: 99%

Nd_0.5Bi_2.5Fe₅₋ _yGa_yO₁₂ thin films on Gd₃Ga₅O₁₂ substrates prepared by metal–organic decomposition

Sasaki

Lou

Liu

et al. 2016

Jpn. J. Appl. Phys.

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“…A detailed calculation of the magnetic field generated by a periodically magnetized videotape can be found in reference [41]. Figure 2 shows an image of the videotape magnetisation seen by using a polarisation microscope, with a GGG (Gadolinium Gallium Garnet) magneto-optical sensor [50] placed on top of a videotape sample. This image is used to measure the period of the recorded pattern, λ = (106.5 ± 0.4) µm [51].…”

Section: The Chipmentioning

confidence: 99%

Experiments on a videotape atom chip: fragmentation and transport studies

Llorente-Garcia¹,

Darquié²,

Curtis³

et al. 2010

New J. Phys.

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This paper reports on experiments with ultra-cold rubidium atoms confined in microscopic magnetic traps created using a piece of periodically-magnetized videotape mounted on an atom chip. The roughness of the confining potential is studied with atomic clouds at temperatures of a few microKelvin and at distances between 30 µm and 80 µm from the videotape-chip surface. The inhomogeneities in the magnetic field created by the magnetized videotape close to the central region of the chip are characterized in this way. In addition, we demonstrate a novel transport mechanism whereby we convey cold atoms confined in arrays of videotape magnetic micro-traps over distances as large as ∼ 1 cm parallel to the chip surface. This conveying mechanism enables us to survey the surface of the chip and observe potential-roughness effects across different regions.

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“…Here, we consider the image contrast C and optical efficiency Q S [14]. Here, we consider the image contrast C and optical efficiency Q S [14].…”

Section: Quality Factors Of Magneto-optical Imagingmentioning

confidence: 99%

“…for a battery-driven source) [14]. α ≈ 88 o gives the highest C [13], while α = 45 o has been considered most advantageous [14] in the second case, and we have used these two values of α in our calculations as well.…”

Section: Quality Factors Of Magneto-optical Imagingmentioning

confidence: 99%

“…We calculate for an example situation that two quality factors that are of interest in the contexts of MO investigation of superconductors [13] and nondestructive evaluation of structural materials [14] could be increased and thus sensor performance enhanced. We calculate for an example situation that two quality factors that are of interest in the contexts of MO investigation of superconductors [13] and nondestructive evaluation of structural materials [14] could be increased and thus sensor performance enhanced.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-optical response of a one-dimensional all-garnet photonic crystal in transmission and reflection

Kahl

Grishin

2004

MRS Proc.

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We present spectra of transmittance, reflectance, and Faraday rotation of transmitted and reflected light for a periodic garnet multilayer structure with a central defect layer. The multilayer consists of alternating layers of bismuth and yttrium iron garnet, is 1.5 µm thick, and was prepared by pulsed laser deposition. For the reflection measurements, a silver mirror was evaporated on top of the multilayer. Faraday rotation is strongly enhanced at resonances in transmission and reflection. The peak value obtained at 748 nm in transmission is 5.3 deg and at 733 nm in reflection is 18 deg. A single layer BIG film of equivalent thickness shows 2.2 deg Faraday rotation at 748 nm. We find rather good agreement between measured and calculated spectra. Using calculations of the distributions of light intensities at different wavelengths inside the multilayer, we are able to give consistent qualitative explanations for the enhancement of Faraday rotation. We also find numerically that -at moderate strengths of the optical resonances -a linear relation exists between Faraday rotation and the intensity integrated over all magneto-optically active layers, if absorption is neglected.We suggest to modify the usual sensor film for magneto-optical imaging by introducing a Bragg mirror consisting of heteroepitaxial garnet layers between the substrate and sensor film. For one example situation, we show by calculation that the quality factors of image contrast and optical efficiency can be higher for heteroepitaxial garnet multilayers than for single-layer iron garnet films currently in use as sensor films.

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Characterization and optimization of magnetic garnet films for magneto-optical visualization of magnetic field distributions

Cited by 20 publications

References 17 publications

Nd_0.5Bi_2.5Fe₅₋ _yGa_yO₁₂ thin films on Gd₃Ga₅O₁₂ substrates prepared by metal–organic decomposition

Nd_0.5Bi_2.5Fe₅₋ _yGa_yO₁₂ thin films on Gd₃Ga₅O₁₂ substrates prepared by metal–organic decomposition

Experiments on a videotape atom chip: fragmentation and transport studies

Magneto-optical response of a one-dimensional all-garnet photonic crystal in transmission and reflection

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Characterization and optimization of magnetic garnet films for magneto-optical visualization of magnetic field distributions

Cited by 20 publications

References 17 publications

Nd0.5Bi2.5Fe5− yGayO12 thin films on Gd3Ga5O12 substrates prepared by metal–organic decomposition

Nd0.5Bi2.5Fe5− yGayO12 thin films on Gd3Ga5O12 substrates prepared by metal–organic decomposition

Experiments on a videotape atom chip: fragmentation and transport studies

Magneto-optical response of a one-dimensional all-garnet photonic crystal in transmission and reflection

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Nd_0.5Bi_2.5Fe₅₋ _yGa_yO₁₂ thin films on Gd₃Ga₅O₁₂ substrates prepared by metal–organic decomposition

Nd_0.5Bi_2.5Fe₅₋ _yGa_yO₁₂ thin films on Gd₃Ga₅O₁₂ substrates prepared by metal–organic decomposition