Effect of stress on the bamboo domains and magnetization process of CoSiB amorphous wire

In this work we have studied the behavior of the bamboo domains under stress (/spl sigma/), tension (+/spl sigma/) as well as compression (-/spl sigma/), with the aim of making the domain model of the negatively magnetostrictive (-/spl lambda//sub 2/) CoSiB wire clear. It Is observed that the growth of the surface bamboo domains due to /spl sigma/ has directivity depending on the orientation of the underlying core domain. In one orientation the black bamboo domain grows, while in the opposite orientation the white domain grows. From the stress behavior of the bamboo domains we have concluded that the domain model of -/spl lambda/, wire consists of two spiral domains of opposite rotation and we propose a new model.