IDEA #33FRKY Indicator Structures For Magneto_Optic Imaging Of Magnetic Irregularities

SCIENTIFIC INNOVATIVE PROJECTS FROM ACADEMY OF TECHNOLOGICAL SCIENCES OF UKRAINE INDICATOR STRUCTURES FOR MAGNETO%OPTIC IMAGING OF MAGNETIC IRREGULIARITIES Description Imaging method is based on magneto(cid:28)optic (MO) Faraday effect that allows a transformation of spatially non(cid:28)uni(cid:28) form distribution of the inspected specimen leakage field into an optical contrast image. Indicator structure consists of soft magnetic epitaxial film of Bi(cid:28)substituted rare earth iron garnet grown by liquid phase epitaxy (LPE) method with deposited mirror and protective layer. The general view of the samples is shown on the fig. 1. A principle of magneto(cid:28)optic visualization using the Bi(cid:28)substituted iron garnet LPE film is shown on fig. 2. Innovative Aspect and Main Advantages The developed LPE technological process ensures obtain(cid:28) ing the following indicator structures: – structure diameter – till 3" (76.2 mm); – structure thickness – 0.5…30 μm; – specific Faraday rotation 2иF @500 nm – till 5·104 deg/cm; @633 nm – till 2·104 deg/cm; @1300 nm – till 2·103 deg/cm. Areas of Application Indicator structures are used for non(cid:28)destructive testing and evaluation of hidden flaw, non(cid:28)uniformities and micro(cid:28) Fig. 1. Substrates and MO indicator structures Fig. 2. Principle of magneto%optic visualizing 1 – light source, 2 – polarizer, 3 – beam split mirror, 4 – trans% parent substrate, 5 – indicator layer, 6 – mirror layer, 7 – inspected specimen, 8 – analyser, 9 – CCD camera defects in ferromagnetic, conductive and super conductive materials, recognizing and authentication of magnetic pro(cid:28) tection marks on banknotes and securities, visualization of magnetic records, topo(cid:28)graphing of electrical currents in planar conductor structure, etc. Stage of Development We are seeking for the partners for joint development and further fabrication of MO visualizers on the base of devel(cid:28) oped indicator structures for different applications. The fabrication technology for Bi(cid:28)substituted rare earth iron garnet films is well worked out in laboratory version. The SRC "Carat" is provided with needed technological and analytical equipment only on 80 %. Contact Details Lviv Regional Department of Academy of Technological Sciences of Ukraine Contact person: Dr. N. Vakiv 202, Stryjska st., Lviv, 79031, Ukraine Тel: 38 0322 63 1065 Fax: 38 0322 94 9735 E(cid:28)mail: vakiv@ipm.lviv.ua the НАУКА ТА ІННОВАЦІЇ. Спецвипуск, 2007 101