Edge effect on coercive field of GMR sensors with meander line structure

Y. H. Chan; M. J. Chen; J. J. Chiang; I. C. Liao; T. H. Wu; C. M. Lee; W. Y. Peng; J. Y. Chen; J. Y. Lai; C. K. Lo; Zung Hang Wei

doi:10.1109/TMAG.2013.2273453

Edge effect on coercive field of GMR sensors with meander line structure

Y. H. Chan, M. J. Chen, J. J. Chiang, I. C. Liao, T. H. Wu, C. M. Lee, W. Y. Peng, J. Y. Chen, J. Y. Lai, C. K. Lo, Zung Hang Wei^*

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Edge effect plays a major role on magnetic properties in permalloy microstructures. To perform high dynamic range, the meander line has been used in giant magnetoresistance (GMR) sensor for increasing the sensor active area. In this paper, we fabricated GMR sensors with various edge structures by using a photolithography and e-beam evaporation system. The device properties are measured by magnetoresistance (MR) system and compared with Object Oriented MicroMagnetic Framework (OOMMF) simulations. Magnetic moment and domain states were analyzed with respect to the edge shapes. The round corners reveal more the formation of magnetic vortex which means lowered magnetostatic energy in the GMR sensor. We found out that by altering the geometry of the edges on the GMR sensors, we can control the coercive field. When the edge structure is circular rather than rectangular, the coercive field is respectively found to be 37.5 Oe rather than 57.5 Oe, yielding a 15% variation rate by utilizing this edge effect.

Original language	English
Article number	2273453
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	1
DOIs	https://doi.org/10.1109/TMAG.2013.2273453
Publication status	Published - 2014 Jan

Keywords

Coercive field
Edge effect
Giant magnetoresistance (GMR)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2013.2273453

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title = "Edge effect on coercive field of GMR sensors with meander line structure",

abstract = "Edge effect plays a major role on magnetic properties in permalloy microstructures. To perform high dynamic range, the meander line has been used in giant magnetoresistance (GMR) sensor for increasing the sensor active area. In this paper, we fabricated GMR sensors with various edge structures by using a photolithography and e-beam evaporation system. The device properties are measured by magnetoresistance (MR) system and compared with Object Oriented MicroMagnetic Framework (OOMMF) simulations. Magnetic moment and domain states were analyzed with respect to the edge shapes. The round corners reveal more the formation of magnetic vortex which means lowered magnetostatic energy in the GMR sensor. We found out that by altering the geometry of the edges on the GMR sensors, we can control the coercive field. When the edge structure is circular rather than rectangular, the coercive field is respectively found to be 37.5 Oe rather than 57.5 Oe, yielding a 15% variation rate by utilizing this edge effect.",

keywords = "Coercive field, Edge effect, Giant magnetoresistance (GMR)",

author = "Chan, {Y. H.} and Chen, {M. J.} and Chiang, {J. J.} and Liao, {I. C.} and Wu, {T. H.} and Lee, {C. M.} and Peng, {W. Y.} and Chen, {J. Y.} and Lai, {J. Y.} and Lo, {C. K.} and Wei, {Zung Hang}",

year = "2014",

month = jan,

doi = "10.1109/TMAG.2013.2273453",

language = "English",

volume = "50",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

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T1 - Edge effect on coercive field of GMR sensors with meander line structure

AU - Chan, Y. H.

AU - Chen, M. J.

AU - Chiang, J. J.

AU - Liao, I. C.

AU - Wu, T. H.

AU - Lee, C. M.

AU - Peng, W. Y.

AU - Chen, J. Y.

AU - Lai, J. Y.

AU - Lo, C. K.

AU - Wei, Zung Hang

PY - 2014/1

Y1 - 2014/1

N2 - Edge effect plays a major role on magnetic properties in permalloy microstructures. To perform high dynamic range, the meander line has been used in giant magnetoresistance (GMR) sensor for increasing the sensor active area. In this paper, we fabricated GMR sensors with various edge structures by using a photolithography and e-beam evaporation system. The device properties are measured by magnetoresistance (MR) system and compared with Object Oriented MicroMagnetic Framework (OOMMF) simulations. Magnetic moment and domain states were analyzed with respect to the edge shapes. The round corners reveal more the formation of magnetic vortex which means lowered magnetostatic energy in the GMR sensor. We found out that by altering the geometry of the edges on the GMR sensors, we can control the coercive field. When the edge structure is circular rather than rectangular, the coercive field is respectively found to be 37.5 Oe rather than 57.5 Oe, yielding a 15% variation rate by utilizing this edge effect.

AB - Edge effect plays a major role on magnetic properties in permalloy microstructures. To perform high dynamic range, the meander line has been used in giant magnetoresistance (GMR) sensor for increasing the sensor active area. In this paper, we fabricated GMR sensors with various edge structures by using a photolithography and e-beam evaporation system. The device properties are measured by magnetoresistance (MR) system and compared with Object Oriented MicroMagnetic Framework (OOMMF) simulations. Magnetic moment and domain states were analyzed with respect to the edge shapes. The round corners reveal more the formation of magnetic vortex which means lowered magnetostatic energy in the GMR sensor. We found out that by altering the geometry of the edges on the GMR sensors, we can control the coercive field. When the edge structure is circular rather than rectangular, the coercive field is respectively found to be 37.5 Oe rather than 57.5 Oe, yielding a 15% variation rate by utilizing this edge effect.

KW - Coercive field

KW - Edge effect

KW - Giant magnetoresistance (GMR)

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Edge effect on coercive field of GMR sensors with meander line structure

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Keywords

ASJC Scopus subject areas

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