Magnetooptical sensors using in-plane biased garnet films supporting domains

Autor(en): Holthaus, C
Trifonov, A
Dotsch, H
Schutzmann, J
Stichwörter: garnet films; GROWTH; imaging; LIQUID-PHASE EPITAXY; magnetic domains; magnetic flux leakage; magnetooptics; Materials Science; Materials Science, Characterization & Testing; VISUALIZATION
Erscheinungsdatum: 2005
Herausgeber: ELSEVIER SCI LTD
Journal: NDT & E INTERNATIONAL
Volumen: 38
Ausgabe: 2
Startseite: 129
Seitenende: 134
Zusammenfassung: 
Rare-earth iron garnet films are currently used as magnetooptical indicator films for visualization of magnetic leakage fields in nondestructive testing. For gray scale imaging in-plane magnetized films are used yielding a high spatial resolution. On the other hand, garnet films supporting magnetic domains can be prepared having a very high sensitivity, while their resolution is limited by the size of the domains. This behavior can be improved considerably by applying a bias induction B-parallel to in the plane of the sensor film. Just above the collapse-induction B-parallel to,B-coll the in-plane magnetized film offers a high spatial resolution with still high sensitivity. Experiments demonstrate a clear improvement of the quality of the magnetooptical imaging. The experimental results are in agreement with calculations. (C) 2004 Elsevier Ltd. All rights reserved.
ISSN: 09638695
DOI: 10.1016/j.ndteint.2004.07.004

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