Interisland spacing and angle effects on magnetic reversal in permalloy arrays

H. Koo; C. Krafft; R. D. Gomez

doi:10.1109/TMAG.2002.801947

Interisland spacing and angle effects on magnetic reversal in permalloy arrays

H. Koo, C. Krafft, R. D. Gomez

KU-KIST Graduate School of Converging Science and Technology

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

1 Citation (Scopus)

Abstract

The switching characteristics of submicron permalloy elements were systematically studied as a function of interisland spacing. The result was an increase of the switching field with reduction in spacing, with a maximum value for near zero spacing. However, in overlapped segments, all elements switched simultaneously at lower fields than the maximum at zero spacing. The switching field depends on the number of connected segments as described by the Jacobs-Bean model, whereas the switching of the separated islands is governed mainly by the field emanating from the nearest-neighbor magnetic poles. The reversal behavior of the branched contiguous array was also studied. The angle between the branch axis and the easy axis played a critical role in establishing the switching field. The reversal field of the branched segment reached a minimum at 45° and a maximum at 90°. A coherent rotation model, which includes the effect of the array geometry, appears to explain the trends.

Original language	English
Pages (from-to)	2559-2561
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	38
Issue number	5 I
DOIs	https://doi.org/10.1109/TMAG.2002.801947
Publication status	Published - 2002 Sept
Event	2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands Duration: 2002 Apr 28 → 2002 May 2

Keywords

Angle
Array
Coherent rotation
Interisland spacing
Permalloy
Switching field

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2002.801947

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title = "Interisland spacing and angle effects on magnetic reversal in permalloy arrays",

abstract = "The switching characteristics of submicron permalloy elements were systematically studied as a function of interisland spacing. The result was an increase of the switching field with reduction in spacing, with a maximum value for near zero spacing. However, in overlapped segments, all elements switched simultaneously at lower fields than the maximum at zero spacing. The switching field depends on the number of connected segments as described by the Jacobs-Bean model, whereas the switching of the separated islands is governed mainly by the field emanating from the nearest-neighbor magnetic poles. The reversal behavior of the branched contiguous array was also studied. The angle between the branch axis and the easy axis played a critical role in establishing the switching field. The reversal field of the branched segment reached a minimum at 45° and a maximum at 90°. A coherent rotation model, which includes the effect of the array geometry, appears to explain the trends.",

keywords = "Angle, Array, Coherent rotation, Interisland spacing, Permalloy, Switching field",

author = "H. Koo and C. Krafft and Gomez, {R. D.}",

note = "Funding Information: Manuscript received February 14, 2002; revised May 22, 2002. This work was supported in part by NSF CAREER Award ECS-9984797 and performed in part at the Cornell Nanofabrication Facility (a member of the National Nanofabri-cation Users Network), which is supported by the National Science Foundation under Grant ECS-9731293, Cornell University, and industrial affiliates.; 2002 International Magnetics Conference (Intermag 2002) ; Conference date: 28-04-2002 Through 02-05-2002",

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AU - Krafft, C.

AU - Gomez, R. D.

N1 - Funding Information: Manuscript received February 14, 2002; revised May 22, 2002. This work was supported in part by NSF CAREER Award ECS-9984797 and performed in part at the Cornell Nanofabrication Facility (a member of the National Nanofabri-cation Users Network), which is supported by the National Science Foundation under Grant ECS-9731293, Cornell University, and industrial affiliates.

PY - 2002/9

Y1 - 2002/9

N2 - The switching characteristics of submicron permalloy elements were systematically studied as a function of interisland spacing. The result was an increase of the switching field with reduction in spacing, with a maximum value for near zero spacing. However, in overlapped segments, all elements switched simultaneously at lower fields than the maximum at zero spacing. The switching field depends on the number of connected segments as described by the Jacobs-Bean model, whereas the switching of the separated islands is governed mainly by the field emanating from the nearest-neighbor magnetic poles. The reversal behavior of the branched contiguous array was also studied. The angle between the branch axis and the easy axis played a critical role in establishing the switching field. The reversal field of the branched segment reached a minimum at 45° and a maximum at 90°. A coherent rotation model, which includes the effect of the array geometry, appears to explain the trends.

AB - The switching characteristics of submicron permalloy elements were systematically studied as a function of interisland spacing. The result was an increase of the switching field with reduction in spacing, with a maximum value for near zero spacing. However, in overlapped segments, all elements switched simultaneously at lower fields than the maximum at zero spacing. The switching field depends on the number of connected segments as described by the Jacobs-Bean model, whereas the switching of the separated islands is governed mainly by the field emanating from the nearest-neighbor magnetic poles. The reversal behavior of the branched contiguous array was also studied. The angle between the branch axis and the easy axis played a critical role in establishing the switching field. The reversal field of the branched segment reached a minimum at 45° and a maximum at 90°. A coherent rotation model, which includes the effect of the array geometry, appears to explain the trends.

KW - Angle

KW - Array

KW - Coherent rotation

KW - Interisland spacing

KW - Permalloy

KW - Switching field

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DO - 10.1109/TMAG.2002.801947

M3 - Conference article

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SN - 0018-9464

VL - 38

SP - 2559

EP - 2561

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 5 I

T2 - 2002 International Magnetics Conference (Intermag 2002)

Y2 - 28 April 2002 through 2 May 2002

ER -

Interisland spacing and angle effects on magnetic reversal in permalloy arrays

Abstract

Keywords

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