Propagation of magnetic bubbles on ion implanted patterns in a (100) Bi-yttrium iron garnet film

Magnetic bubbles have been propagated on ion implanted patterns in a (100) garnet film for the first time. Charged walls form in the implanted layer at the edges of unimplanted features due to stress relief at the pattern edges. In response to a rotating in-plane field, they circulate completely around unimplanted circles and 8-μm contiguous disk patterns, carrying underlying bubbles along. This is because in the Bi-yttrium iron garnet composition used, the magnetostriction coefficients λ100 and λ111 are both negative.