Properties of Magnetic Garnet Films for Flexible Magneto-Optical Indicators Fabricated by Spin-Coating Method

Abstract

Non-destructive testing using a magneto-optical effect is a high-resolution non-destructive inspection technique for a metallic structure. It is able to provide high-spatial resolution images of defects. Previously, it has been difficult to fabricate flexible magneto-optical sensors because thermal treatment is necessary to crystallize the magnetic garnet. Therefore, it was not possible to apply magneto-optical imaging to complicated shapes in a test subject, such as a curved surface. In this study, we developed a new process for deposition of the magnetic garnet on the flexible substrate by applying the magnetic garnet powders that have already undergone crystallization. In this new process, as it does not require thermal treatment after deposition, flexible substrates with low heat resistance can be used. In this paper, we report our observations of the optical properties, magnetic hysteresis loop, crystallizability and density of the particles on the flexible substrate deposited by the spin-coating method.

Nonlinear Optical Microscopy of Interface Layers of Epitaxial Garnet Films

“…Magnetic domains are of high interest to researchers due to both the bright underlying physics that governs their organization, and because of an important role played by domains in a lot of applications of magnetic nano-and microstructures [1]. One of the most studied and attractive objects here are the crystalline ferrimagnetic iron garnet films that combine strong magnetooptical (MO) activity with high transparency in the red and infrared spectral ranges, pronounced mechanical properties, and the ability to control the parameters of the MO spectra by modification of their chemical composition [2][3][4][5]. It is generally recognized that garnets are widely used as optical disks [6], resonators [7], and in microwave devices [8].…”

High performance mid-infrared optical isolators based on Y3Fe5O12 magneto-optic ceramics

“…In comparison, CeF3 exhibits transmittances of over 85% in the range of 500 to 2500 nm but cannot be utilized in longerwavelength FIs as its transmittance decreases to zero after 2500 nm. On the other hand, Dy2O3 exhibits multiple significant absorptions in the mid-infrared region, limiting its use in FIs at specific wavelengths 16,39,40 . Unlike common paramagnetic materials, the ferromagnetic materials were characterized in the saturated regime of the Faraday effect, in which the polarization rotation angle induced by the material does not increase further with the increase in the strength of the applied magnetic field.…”

“…The effective transition wavelengths 𝜆 0,1 corresponding to these transitions also vary with the temperature. The last term is a wavelength-independent gyromagnetic contribution 𝐺 (𝑆) of the magnetic dipole transitions, which have resonances in the far-infrared and microwave regions 39,[41][42][43][44] .…”

Tuning of Magnetic Damping in Y3Fe5O12/Metal Bilayers for Spin-Wave Conduit Termination

“…A material of choice for complex SW conduits is yttrium iron garnet (YIG) in the single-crystal phase [8]. The growth of ultra-low damping YIG films has been optimized in the last decade [9][10][11][12] and the development of garnet layers is ongoing [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Hitherto, state-of-art YIG films provide high relaxation times of hundreds of nanoseconds corresponding to millimeterscale SW decay length [27][28][29].…”