Investigation of the magnetic interaction of small permalloy particles

H. Koo; M. Dreyer; V. V. Metlushko; R. D. Gomez

doi:10.1109/20.951049

Investigation of the magnetic interaction of small permalloy particles

H. Koo, M. Dreyer, V. V. Metlushko, R. D. Gomez

Research output: Contribution to journal › Conference article › peer-review

5 Citations (Scopus)

Abstract

Permalloy island arrays and undulated lines were systematically studied by MFM to clarify the effect of neighbor magnetic interaction. The islands are 860 nm × 320 nm and 35 nm thick, single domains and patterned to have preferential interaction along the easy and hard axes. The switching field for easy axis interaction is relatively high, i.e., 370 Oe with a 32 Oe spread; while the hard axis interaction produces a switching field of 130 Oe and a slightly wider distribution of over 40 Oe. A third array is comprised of undulated lines with connected segments. Magnetic charges accumulate at the ends of each segment, and yield the strongest possible interaction along the easy axis. In this case all segments on one line simultaneously switch at a specific field. The switching field increases linearly from 150 Oe with the number of segments up to a maximum number of 50, and approaches a constant field of 290 Oe. The results favorably compare with the prediction for parallel rotation of the Jacobs-Bean chain of spheres model.

Original language	English
Pages (from-to)	2049-2051
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	37
Issue number	4 I
DOIs	https://doi.org/10.1109/20.951049
Publication status	Published - 2001 Jul
Event	8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) - San Antonio, TX, United States Duration: 2001 Jan 7 → 2001 Jan 11

Bibliographical note

Funding Information:
Manuscript received October 13, 2000; revised February 7, 2001. This work was supported in part by NSF CAREER AWARD ECS-9984797 H. Koo, M. Dreyer, and R. D. Gomez are with the Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742 USA. They are also with the Laboratory for Physical Sciences, College Park, MD 20740 USA (e-mail: [email protected]). V. V. Metlushko is with the Department of Electrical Engineering and Computer Science, University of Illinois, Chicago, IL 60607 USA. Publisher Item Identifier S 0018-9464(01)07278-8.

Keywords

Array
Chain of spheres model
Jacobs-Bean model
Magnetic interaction
Parallel rotation
Permalloy
Switching distribution
Undulated line

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.951049

Cite this

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title = "Investigation of the magnetic interaction of small permalloy particles",

abstract = "Permalloy island arrays and undulated lines were systematically studied by MFM to clarify the effect of neighbor magnetic interaction. The islands are 860 nm × 320 nm and 35 nm thick, single domains and patterned to have preferential interaction along the easy and hard axes. The switching field for easy axis interaction is relatively high, i.e., 370 Oe with a 32 Oe spread; while the hard axis interaction produces a switching field of 130 Oe and a slightly wider distribution of over 40 Oe. A third array is comprised of undulated lines with connected segments. Magnetic charges accumulate at the ends of each segment, and yield the strongest possible interaction along the easy axis. In this case all segments on one line simultaneously switch at a specific field. The switching field increases linearly from 150 Oe with the number of segments up to a maximum number of 50, and approaches a constant field of 290 Oe. The results favorably compare with the prediction for parallel rotation of the Jacobs-Bean chain of spheres model.",

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author = "H. Koo and M. Dreyer and Metlushko, {V. V.} and Gomez, {R. D.}",

note = "Funding Information: Manuscript received October 13, 2000; revised February 7, 2001. This work was supported in part by NSF CAREER AWARD ECS-9984797 H. Koo, M. Dreyer, and R. D. Gomez are with the Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742 USA. They are also with the Laboratory for Physical Sciences, College Park, MD 20740 USA (e-mail: [email protected]). V. V. Metlushko is with the Department of Electrical Engineering and Computer Science, University of Illinois, Chicago, IL 60607 USA. Publisher Item Identifier S 0018-9464(01)07278-8.; 8th Joint Magnetism and Magnetic Materials -International Magnetic Conference- (MMM-Intermag) ; Conference date: 07-01-2001 Through 11-01-2001",

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N2 - Permalloy island arrays and undulated lines were systematically studied by MFM to clarify the effect of neighbor magnetic interaction. The islands are 860 nm × 320 nm and 35 nm thick, single domains and patterned to have preferential interaction along the easy and hard axes. The switching field for easy axis interaction is relatively high, i.e., 370 Oe with a 32 Oe spread; while the hard axis interaction produces a switching field of 130 Oe and a slightly wider distribution of over 40 Oe. A third array is comprised of undulated lines with connected segments. Magnetic charges accumulate at the ends of each segment, and yield the strongest possible interaction along the easy axis. In this case all segments on one line simultaneously switch at a specific field. The switching field increases linearly from 150 Oe with the number of segments up to a maximum number of 50, and approaches a constant field of 290 Oe. The results favorably compare with the prediction for parallel rotation of the Jacobs-Bean chain of spheres model.

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Investigation of the magnetic interaction of small permalloy particles

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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