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Measurement of the magnetostriction constant of bi-doped garnets by optical observation of stress-induced stripe domains

By: Mayergoyz, I.D.; Rojas, R.; Krafft, C.; Nistor, I.;

2004 / IEEE

Description

This item was taken from the IEEE Periodical ' Measurement of the magnetostriction constant of bi-doped garnets by optical observation of stress-induced stripe domains ' In this paper, we report on the optical investigation of magnetic microstructures in Bi substituted garnet thin films grown by epitaxial deposition on (111)-oriented gallium gadolinium garnet substrates. The specimens are magnetically diluted with Ga ions. By using a technique based on the bending of the thin film, the appearance of a straight stripe domain pattern is observed. The changes in this stripe pattern due to external applied in-plane and out-of-plane fields are correlated to those induced by a known applied stress. We show that this method can be used to compute the magnetostriction coefficient /spl lambda//sub 111/ of the material. One important advantage of this method is that it allows a real-time optical observation of the manifestations of magnetoelastic interactions.