Study of field‐driven wall‐configuration conversions for laminated Permalloy in the easy‐axis state
| Autor: | M. L. Komsa, B. E. Argyle, D. A. Herman, D. F. Canaperi, B. Petek, Lubomyr T. Romankiw, Panayotis C. Andricacos, Philip L. Trouilloud, D. L. Rath, S. Krongelb |
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| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 63:4036-4038 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.340541 |
| Popis: | Laminated Permalloy, with edge‐curling walls replacing closure domains, has been proposed to increase permeability and reduce wall noise in recording. However, in structures meeting the criteria for Slonczewski’s ‘‘easy‐axis’’ state, normal walls often coexist with edge‐curling walls. We have used our laser magneto‐optic microscope to study inductive‐head‐yoke shaped elements of two and four Permalloy layers separated by nonmagnetic, metallic spacers. In the four‐magnetic‐layer sample a state with a single wall, terminating at the edge‐curling regions and lying along the easy‐axis direction, is often observed on the top and bottom layers. Some elements may be driven into an easy‐axis state with no observed domain walls. The two‐magnetic‐layer sample also exhibited simultaneous one‐wall structures on the top and bottom layers. The other stable configuration was a no‐wall state on the top layer and a two‐wall (three‐domain) state on the lower layer. These ‘‘coupled’’ states were exceptionally stable in both... |
| Databáze: | OpenAIRE |
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