Dynamic Magneto‐Optical Imaging of Domains in Grain‐Oriented Electrical Steel. Issue 2 (16th April 2015)

• Record Type: Journal Article
• Authors: Richert, Hendryk; Schmidt, Heidemarie; Lindner, Sandra; Lindner, Morris; Wenzel, Benjamin; Holzhey, Rocco; Schäfer, Rudolf
• Is Part Of: Steel research international. Volume 87:Issue 2(2016)
• Page Start: 232
• Page End: 240
• Publication Date: 2015-04-16
• Subjects: flux leakage -- GOES -- Kerr effect -- magnetic domain -- magneto‐optics; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201500013
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : Magneto‐optical imaging with magneto‐optical indicator films (MOIF) is a versatile method to characterize magnetic field distributions especially for material development and quality control. Magnetic domains and grains in grain‐oriented electrical steel can be visualized, and quantified without removing the isolation layer. The combination of MOIF with digital high‐speed camera technology enables temporally resolved investigations of the magnetization processes. In contrast to Kerr‐effect measurements MOIF imaging works without sample preparation and even in the presence of industrial insulation coatings. Optical resolution of 25 microns and temporal resolution of 1 ms in single‐shot mode could be demonstrated. Abstract : The article presents the use of sensitive magneto‐optical indicator film (MOIF) imaging as a comprehensive method for characterizing magnetic domains in grain‐oriented electrical steels (GOES). MOIF imaging provides magnetic flux density distribution with a lateral resolution of 25 μm. Most important findings are (i) temporal resolution of 1 ms and (ii) the ability to be used on top of standard isolation layers.