TY - CHAP A1 - Dötsch, Horst A1 - Klank, M. A1 - Hagedorn, Oliver A1 - Holthaus, C. A1 - Shamonin (Chamonine), Mikhail A1 - Trifonov, A. T1 - Optimization of Magnetic Garnet Films for Magneto-Optical Imaging of Magnetic Field Distributions T2 - Magneto-Optical Imaging. Proceedings of the NATO Advanced Research Workshop on Magneto-Optical Imaging, Øystese, Norway, 28 - 30 August 2003 N2 - Rare-earth iron garnet films are currently applied for magneto-optical imaging of magnetic field distributions. The physical properties of the films can be controlled by the chemical composition, the growth conditions and the crystallographic orientation. The sensor properties must be optimized according to the application desired. A new optimization method is introduced based on the swing of the photoresponse. An application example is presented. Furthermore, the sensitivity can be strongly enhanced using specific crystallographic orientations which induce an easy plane of magnetization being tilted with respect to the film plane. Experimental results of a [112] oriented garnet film are in good agreement with calculations. The influence of the cubic anisotropy on the sensor performance is discussed. Finally, it is shown that also domain films can be applied for magneto-optical imaging. KW - Magneto-optics KW - imaging KW - magnetic garnet films Y1 - 2004 U6 - https://doi.org/10.1007/978-94-007-1007-8_39 SP - 301 EP - 309 PB - KLuwer CY - Dodrecht ER - TY - CHAP A1 - Holthaus, C. A1 - Hagedorn, Oliver A1 - Klank, M. A1 - Shamonin (Chamonine), Mikhail A1 - Trifonov, A. A1 - Dötsch, Horst T1 - Preparation and Characterization of Sensitive Magnetic Garnet Films for MOI Applications T2 - Magneto-Optical Imaging. Proceedings of the NATO Advanced Research Workshop on Magneto-Optical Imaging, Øystese, Norway, 28 - 30 August 2003 N2 - Magnetic garnet films prepared by liquid phase epitaxy on paramagnetic substrates of gadolinium gallium garnet are currently used for the imaging of magnetic field distributions. This application is based on the Faraday rotation which can be strongly enhanced by bismuth incorporation. For gray scale imaging the plane of the sensor film should be an easy plane of magnetization so that no domains nucleate. However, incorporation of bismuth induces a strong positive uniaxial anisotropy perpendicular to the film plane, especially if films of [111] orientation are used. To counteract this unwanted behavior neodymium and/or praseodymium are substituted in addition to bismuth. These two elements cause a very strong negative anisotropy. This is tested experimentally by growing series of garnet films with gradually changing composition and growth parameters. KW - Magneto-optics KW - Imaging KW - Garnet films Y1 - 2004 U6 - https://doi.org/10.1007/978-94-007-1007-8_42 SP - 329 EP - 336 PB - Kluwer CY - Dodrecht ER - TY - JOUR A1 - Klank, M. A1 - Hagedorn, Oliver A1 - Shamonin (Chamonine), Mikhail A1 - Rosen, H. A1 - Dötsch, Horst T1 - Sensitive magneto-optical sensors for visualization of magnetic fields using garnet films of specific orientations JF - Journal of Applied Physics N2 - Garnet films of high Faraday rotation are applied as magneto-optical sensors to visualize the spatial distribution of magnetic fields. Using specific orientations, the induced anisotropy can generate an easy plane of magnetization which is inclined with respect to the film plane. If the magnetization lies in this plane a very high sensitivity can be achieved. The dependence of the geometrical orientation of the easy plane on the growth direction is calculated and the sensitivity and dynamic range are derived. Experimental results of a [112] oriented garnet film are in good agreement with calculations. Y1 - 2002 U6 - https://doi.org/10.1063/1.1516839 VL - 92 PB - AIP ER - TY - CHAP A1 - Dötsch, Horst A1 - Holthaus, C. A1 - Trifonov, A. A1 - Klank, M. A1 - Hagedorn, Oliver A1 - Shamonin (Chamonine), Mikhail A1 - Schützmann, J. T1 - Application of Magnetic Garnet Films for Magnetooptical Imaging of Magnetic Field Distributions T2 - MRS Online Proceedings Library N2 - Rare-earth iron garnet films of high quality can be grown by liquid phase epitaxy on paramagnetic substrates of gadolinium galliumgarnet. Such films are currently used for imaging of the spatial distribution of magnetic fields. This application is based on the Faraday rotation which can strongly be enhanced by bismuth incorporation. The physical properties of the films can be controlled by the chemical composition, the growth conditions and the crystallographic orientation. The sensor properties like sensitivity, dynamic range, signal linearity and unambiguity must be optimized according to the application desired. These properties, however, are not independent of each other. In addition, they strongly depend on the optical wavelength. Thus, it is necessary to find compromises. The influence of Faraday rotation, Faraday ellipticity, optical absorption, magnetic anisotropies and film thickness on the performance of a magnetooptical indicator film is investigated. Based on the swing of the photoresponse, a new optimization process is introduced. The process is experimentally verified and application examples are demonstrated. Furthermore, two methods are presented to enhance the sensitivity of magnetooptical sensors. Using specific crystallographic orientations, an easy plane of magnetization can be induced which is inclined with respect to the film plane. If the magnetization lies in this plane a very high sensitivity is achieved. The dependence of the geometrical orientation of the easy plane on the growth direction is calculated and the sensitivity and dynamic range are derived. Experimental results of a [112] oriented garnet film are in good agreement with calculations. Garnet films which are magnetized along the film normal due to a strong induced uniaxial anisotropy support magnetic domains. If the collapse field perpendicular to the film plane is small, such films can be used as very sensitive indicator films. Such films are easier to prepare than sensitive in-plane films. However, the spatial resolution is limited by the size of the domains. This disadvantage can be avoided by applying a bias field in the film plane. Directly at the in-plane collapse field the sensor film is in-plane magnetized yielding high spatial resolution at still high sensitivity. The variation of magnetooptical images with in-plane induction is demonstrated. Experimental results are in agreement with calculations. Y1 - 2004 U6 - https://doi.org/10.1557/PROC-834-J6.1 SP - 18 EP - 29 PB - Springer ER - TY - JOUR A1 - Klank, M. A1 - Hagedorn, Oliver A1 - Holthaus, C. A1 - Shamonin (Chamonine), Mikhail A1 - Dötsch, Horst T1 - Characterization and optimization of magnetic garnet films for magneto-optical visualization of magnetic field distributions JF - NDT & E International N2 - Rare-earth iron garnet films with in-plane anisotropy grown on (111)-oriented substrates can be used as magneto-optical indicator films for visualization of magnetic leakage fields in nondestructive evaluation. The influence of Faraday rotation, Faraday ellipticity, absorption and film thickness on the performance of a magneto-optical indicator film is investigated. A new optimization method is introduced and compared with the method of contrast optimization. The theory is experimentally verified and an application example is presented. KW - Magneto-optics KW - Imaging KW - Magnetic flux leakage KW - Garnet films Y1 - 2003 U6 - https://doi.org/10.1016/S0963-8695(03)00012-4 VL - 36 IS - 6 SP - 375 EP - 381 PB - Elsevier ER - TY - JOUR A1 - Shamonin (Chamonine), Mikhail A1 - Klank, M. A1 - Hagedorn, Oliver A1 - Dötsch, Horst T1 - Magneto-optical visualization of metal-loss defects in a ferromagnetic plate: experimental verification of theoretical modeling JF - Applied optics N2 - Rare-earth iron garnet films with in-plane magnetic anisotropy grown on [111]-oriented substrates are promising for the visualization of magnetic leakage fields in nondestructive evaluation. Such magneto-optical films have to be specifically engineered, and we give an example of this technology. To assess the validity and accuracy of finite-element calculations of a magnetization assembly combined with the physical modeling of the image formation, comparisons between calculated and experimentally obtained magneto-optical images of metal-loss defects have been made. A convincing quantitative agreement is demonstrated. It is shown that both physical and computer modeling techniques allow for a predictive engineering design of the prospective applications and provide greater insight into the method. Y1 - 2001 U6 - https://doi.org/10.1364/ao.40.003182 VL - 40 IS - 19 SP - 3182 EP - 3189 PB - Optica Publishing Group ER - TY - JOUR A1 - Shamonin (Chamonine), Mikhail A1 - Beuker, T. A1 - Rosen, P. A1 - Klank, M. A1 - Hagedorn, Oliver A1 - Dötsch, Horst T1 - Feasibility of magneto-optic flaw visualization using thin garnet films JF - NDT & E International N2 - We investigate the feasibility of using rare-earth iron garnet films grown on (111)-oriented substrates as magneto-optic indicator films for the visualization of magnetic leakage fields in non-destructive evaluation. In most cases the leakage field of the defect has a strong component in the film plane. The influence of this in-plane dc magnetic field on the image formation is investigated. It is shown that the presence of a strong in-plane magnetic field allows one to extend the dynamic range of the out-of-plane field imposed by the uniaxial anisotropy field HA. On the other hand, an in-plane field reduces the sensitivity. The guidelines for selecting parameters of magneto-optic indicator films are given. KW - Garnet films KW - Magneto-optics KW - Imaging KW - Flaw visualization KW - Magnetic flux leakage Y1 - 2000 U6 - https://doi.org/10.1016/s0963-8695(00)00028-1 VL - 33 IS - 8 SP - 547 EP - 553 PB - Elsevier ER -