Magnetic reversal of tapered permalloy bars with holes in the center

C. Merton, G. D. Skidmore, J. Schmidt, E. D. Dahlberg, H. Wan, B. Pant

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

The magnetic reversal mechanism of tapered permalloy bars with holes in the center was studied using a Magnetic Force Microscope with in situ magnetic field capability. The samples studied were lithographically patterned from a 20-nm-thick NiFe film using a subtractive process to create tapered bars 18 wide X 348 μm long. The easy axis of the permalloy is parallel to the long axis of the bar. In the center of the tapered bar was either a 10, 5, or 3 μm diameter hole. The remnant state after saturation parallel to the long axis of the bar is a large domain magnetized along the saturating field direction except near the hole. The magnetization at the edge of the hole can be explained by considering edge pinning and the last direction of a saturating magnetic field. An inplane magnetic field parallel to the long axis of the bar reverses the magnetization by domain nucleation at the edge of the hole. After the bar has reversed, the same type of wall structure is seen as in the remnant state. As the magnetic field is increased further, the magnetization rotates away from parallel to the edge of the hole, as seen by the emergence of surface poles along the hole edge.

Original languageEnglish (US)
Pages (from-to)4601-4603
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
DOIs
StatePublished - Apr 15 1999
EventProceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States
Duration: Nov 9 1998Nov 12 1998

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    Merton, C., Skidmore, G. D., Schmidt, J., Dahlberg, E. D., Wan, H., & Pant, B. (1999). Magnetic reversal of tapered permalloy bars with holes in the center. Journal of Applied Physics, 85(8 II A), 4601-4603. https://doi.org/10.1063/1.370421