Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1805366 | Journal of Magnetism and Magnetic Materials | 2006 | 5 Pages |
Realization of pulsed-current selectable domain configurations of small permalloy islands is reported. In the islands with 65–100 nm thickness and micron-sized lateral dimensions, the magnetic domain pattern can be uniquely set into either a four or seven closure domain configuration by applying either a positive or negative 10 ns current pulse at the density of 107 A/cm2. The transition is completely reversible. This phenomenon appears to belong to a family of current-induced magnetization reordering, whose main mechanism appears to be domain wall motion due to s-d exchange force directed along the electron flow, and partially influenced by the Amperian field produced at the contact regions. This paper presents two cases, namely, bi-stable and tri-stable configurations, and discusses the mechanism as well as power requirements in using this approach for memory device applications.