Magnetooptic Observation Of Domains At Low Temperature In The Transparent Ferromagnet LiHoF[sub]4[/sub]

Peter Meyer; Jacques Pommier; Jacques Ferre

doi:10.1117/12.961386

14 December 1989 Magnetooptic Observation Of Domains At Low Temperature In The Transparent Ferromagnet LiHoF₄

Peter Meyer, Jacques Pommier, Jacques Ferre

Proceedings Volume 1126, Electro-Optic and Magneto-Optic Materials and Applications; (1989) https://doi.org/10.1117/12.961386
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

Abstract

The capability of magnetooptic microscopy has been improved considerably thanks to the use of CCD cameras and digital image processing. Using Faraday-effect, we observed the evolution of the magnetic domain structure in the dipolar uniaxial ferromagnet LiHoF4 at very low temperatures (below Tc = 1.54 K) and determined its (H, T) magnetic phase diagram. The possibility of digital image averaging and image substraction increases significantly the sensitivity of the microscopic observation. This is illustrated by the ability to visualise the domain structure near Tc, where contrast is very low. Scanning over the depth of the specimen allows, in simple cases, the determination of the 3-dimensional domain shape. We shall discuss the nucleation process of magnetic bubbles in very thick samples (up to 2mm) from spike shaped domains originating near their surface.

Citation Download Citation

Peter Meyer, Jacques Pommier, and Jacques Ferre "Magnetooptic Observation Of Domains At Low Temperature In The Transparent Ferromagnet LiHoF₄", Proc. SPIE 1126, Electro-Optic and Magneto-Optic Materials and Applications, (14 December 1989); https://doi.org/10.1117/12.961386

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