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Title: Slow magnetization dynamics of small permalloy islands

Abstract

The conditions that lead to specific domain configurations and the associated switching characteristics of small permalloy islands were studied by using magnetic force microscopy. By measuring a large number of particles, it was established that islands that have nonzero remanent moments (nonsolenoidal) exist in one of three distinct configurations, namely: (a) true single domain, (b) quasisingle domain with edge closure patterns, and (c) multidomain with nonuniform internal magnetization. The configuration depended upon the island width as well as the aspect ratio. Islands that are 310 nm wide or less are true single domain particles at low aspect ratios ({approx}1.87) and higher, while islands wider than 500 nm always exhibited edge closure domains even for very large aspect ratios. In the range between 310 and 500 nm, the onset of single domain behavior was a function of the aspect ratio and thickness. Our studies involving in situ applied field similarly revealed the mechanisms of the reversal processes for each of the configurations, which correlated quite well with the values of the switching fields. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [1];  [1];  [3]
  1. Laboratory for Physical Sciences, 8050 Greenmead Drive, College Park, Maryland 20740 and (United States)
  2. (United States)
  3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845 (United States)
Publication Date:
OSTI Identifier:
20216223
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PERMALLOY; MAGNETIZATION; DOMAIN STRUCTURE; MICROSCOPY; NICKEL ALLOYS; IRON ALLOYS; PARTICLES; EXPERIMENTAL DATA

Citation Formats

Koo, H., Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, Luu, T. V., Gomez, R. D., and Metlushko, V. V. Slow magnetization dynamics of small permalloy islands. United States: N. p., 2000. Web. doi:10.1063/1.373266.
Koo, H., Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, Luu, T. V., Gomez, R. D., & Metlushko, V. V. Slow magnetization dynamics of small permalloy islands. United States. doi:10.1063/1.373266.
Koo, H., Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, Luu, T. V., Gomez, R. D., and Metlushko, V. V. Mon . "Slow magnetization dynamics of small permalloy islands". United States. doi:10.1063/1.373266.
@article{osti_20216223,
title = {Slow magnetization dynamics of small permalloy islands},
author = {Koo, H. and Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742 and Luu, T. V. and Gomez, R. D. and Metlushko, V. V.},
abstractNote = {The conditions that lead to specific domain configurations and the associated switching characteristics of small permalloy islands were studied by using magnetic force microscopy. By measuring a large number of particles, it was established that islands that have nonzero remanent moments (nonsolenoidal) exist in one of three distinct configurations, namely: (a) true single domain, (b) quasisingle domain with edge closure patterns, and (c) multidomain with nonuniform internal magnetization. The configuration depended upon the island width as well as the aspect ratio. Islands that are 310 nm wide or less are true single domain particles at low aspect ratios ({approx}1.87) and higher, while islands wider than 500 nm always exhibited edge closure domains even for very large aspect ratios. In the range between 310 and 500 nm, the onset of single domain behavior was a function of the aspect ratio and thickness. Our studies involving in situ applied field similarly revealed the mechanisms of the reversal processes for each of the configurations, which correlated quite well with the values of the switching fields. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373266},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}