Formation of magnetic structure by domain wall confinement in nanoconstriction

Ngo, D.-T., Hickey, M.C., McGrouther, D. , McVitie, S. , Marrows, C.H., Chapman, J.N. and Awano, H. (2011) Formation of magnetic structure by domain wall confinement in nanoconstriction. IEEE Transactions on Magnetics, 47(10), pp. 2511-2514. (doi: 10.1109/TMAG.2011.2156395)

Abstract

We present here a study of exploiting Lorentz transmission electron microscopy to observe the magnetic structure in a nanobridge formed by confining a magnetic domain wall. The domain wall is nucleated in an elliptical pad by magnetization reversal and is driven to be pinned at the constriction to form a complex magnetic structure. High-resolution Lorentz microscopy shows that such a structure is composed by a mixture of S and C states of smooth rotation of the magnetization through the nanobridge rather than a conventional single wall as observed previously. This confinement contributes a domain wall resistance observed via anisotropic magnetoresistance presented previously. A serial transformation from S state to S/C mixture, to C state and finally to S state of the topology of the flux is evidently confirmed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: McVitie, Professor Stephen and McGrouther, Dr Damien and Chapman, Professor John
• Authors: Ngo, D.-T., Hickey, M.C., McGrouther, D., McVitie, S., Marrows, C.H., Chapman, J.N., and Awano, H.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: IEEE Transactions on Magnetics
• ISSN: 0018-9464