Formation of Magnetic Structure by Domain Wall Confinement in Nanoconstriction

Duc-The Ngo; M. C. Hickey; D. McGrouther; S. McVitie; C. H. Marrows; J. N. Chapman; H. Awano

doi:10.1109/TMAG.2011.2156395

Formation of Magnetic Structure by Domain Wall Confinement in Nanoconstriction

Duc-The Ngo
, M. C. Hickey
, D. McGrouther
, S. McVitie
, C. H. Marrows
, J. N. Chapman
, H. Awano

Massachusetts Institute of Technology
University of Glasgow
University of Leeds
Toyota Technological Institute

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

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.

Original language	English
Journal	IEEE Transactions on Magnetics
Volume	47
Issue number	10
Pages (from-to)	2511-2514
ISSN	0018-9464
DOIs	https://doi.org/10.1109/TMAG.2011.2156395
Publication status	Published - 2011
Externally published	Yes

Keywords

magnetic anisotropy
magnetic domain walls
magnetic structure
magnetisation reversal
magnetoresistance
nanofabrication
nanomagnetics
nanostructured materials
nucleation
transmission electron microscopy

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title = "Formation of Magnetic Structure by Domain Wall Confinement in Nanoconstriction",

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.",

keywords = "magnetic anisotropy, magnetic domain walls, magnetic structure, magnetisation reversal, magnetoresistance, nanofabrication, nanomagnetics, nanostructured materials, nucleation, transmission electron microscopy",

author = "Duc-The Ngo and Hickey, \{M. C.\} and D. McGrouther and S. McVitie and Marrows, \{C. H.\} and Chapman, \{J. N.\} and H. Awano",

year = "2011",

doi = "10.1109/TMAG.2011.2156395",

language = "English",

volume = "47",

pages = "2511--2514",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "10",

}

TY - JOUR

T1 - Formation of Magnetic Structure by Domain Wall Confinement in Nanoconstriction

AU - Ngo, Duc-The

AU - Hickey, M. C.

AU - McGrouther, D.

AU - McVitie, S.

AU - Marrows, C. H.

AU - Chapman, J. N.

AU - Awano, H.

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - magnetic anisotropy

KW - magnetic domain walls

KW - magnetic structure

KW - magnetisation reversal

KW - magnetoresistance

KW - nanofabrication

KW - nanomagnetics

KW - nanostructured materials

KW - nucleation

KW - transmission electron microscopy

U2 - 10.1109/TMAG.2011.2156395

DO - 10.1109/TMAG.2011.2156395

M3 - Journal article

SN - 0018-9464

VL - 47

SP - 2511

EP - 2514

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 10

ER -

Formation of Magnetic Structure by Domain Wall Confinement in Nanoconstriction

Abstract

Keywords

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