Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States

Trevor P. Almeida; Adrian R. Muxworthy; András Kovács; Wyn Williams; Leslei Nagy; Pádraig O. Conbhuí; Cathrine Frandsen; Radchagrit Supakulopas; Rafal E. Dunin-Borkowski

doi:10.1002/2016GL070074

Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States

Trevor P. Almeida
, Adrian R. Muxworthy
, András Kovács
, Wyn Williams
, Leslei Nagy
, Pádraig O. Conbhuí
, Cathrine Frandsen
, Radchagrit Supakulopas
, Rafal E. Dunin-Borkowski

Department of Physics

Imperial College London
University of Edinburgh
Jülich Research Centre

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

465 Downloads (Orbit)

Abstract

The thermal demagnetization of pseudo-single-domain (PSD) magnetite (Fe₃O₄) particles, which govern the magnetic signal in many igneous rocks, is examined using off-axis electron holography. Visualization of a vortex structure held by an individual Fe₃O₄ particle (~250nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Stepwise demagnetization of the remanence-induced Fe₃O₄ particle upon heating to above the Curie temperature, performed in a similar fashion to bulk thermal demagnetization measurements, revealed that its vortex state remains stable under heating close to its unblocking temperature and is recovered upon cooling with the same or reversed vorticity. Hence, the PSD Fe3O4 particle exhibits thermomagnetic behavior comparable to a single-domain carrier, and thus, vortex states are considered reliable magnetic recorders for paleomagnetic investigations.

Original language	English
Journal	Geophysical Research Letters
Volume	43
Issue number	16
Pages (from-to)	8426-8434
Number of pages	9
ISSN	0094-8276
DOIs	https://doi.org/10.1002/2016GL070074
Publication status	Published - 2016

Bibliographical note

This is an open access article under the terms of the Creative Commons Attribution License

Access to Document

10.1002/2016GL070074

Grl54809Final published version, 4.72 MB

OpenUrl availability

Check availability in DTU Findit

Cite this

Almeida, T. P., Muxworthy, A. R., Kovács, A., Williams, W., Nagy, L., Conbhuí, P. O., Frandsen, C., Supakulopas, R., & Dunin-Borkowski, R. E. (2016). Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States. Geophysical Research Letters, 43(16), 8426-8434. https://doi.org/10.1002/2016GL070074

@article{cf031153983a445386cb1b7e7e34f1a2,

title = "Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States",

abstract = "The thermal demagnetization of pseudo-single-domain (PSD) magnetite (Fe3O4) particles, which govern the magnetic signal in many igneous rocks, is examined using off-axis electron holography. Visualization of a vortex structure held by an individual Fe3O4 particle (\textasciitilde{}250nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Stepwise demagnetization of the remanence-induced Fe3O4 particle upon heating to above the Curie temperature, performed in a similar fashion to bulk thermal demagnetization measurements, revealed that its vortex state remains stable under heating close to its unblocking temperature and is recovered upon cooling with the same or reversed vorticity. Hence, the PSD Fe3O4 particle exhibits thermomagnetic behavior comparable to a single-domain carrier, and thus, vortex states are considered reliable magnetic recorders for paleomagnetic investigations.",

author = "Almeida, \{Trevor P.\} and Muxworthy, \{Adrian R.\} and Andr{\'a}s Kov{\'a}cs and Wyn Williams and Leslei Nagy and Conbhu{\'i}, \{P{\'a}draig O.\} and Cathrine Frandsen and Radchagrit Supakulopas and Dunin-Borkowski, \{Rafal E.\}",

note = "This is an open access article under the terms of the Creative Commons Attribution License",

year = "2016",

doi = "10.1002/2016GL070074",

language = "English",

volume = "43",

pages = "8426--8434",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley and Sons Inc.",

number = "16",

}

Almeida, TP, Muxworthy, AR, Kovács, A, Williams, W, Nagy, L, Conbhuí, PO, Frandsen, C, Supakulopas, R & Dunin-Borkowski, RE 2016, 'Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States', Geophysical Research Letters, vol. 43, no. 16, pp. 8426-8434. https://doi.org/10.1002/2016GL070074

Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States. / Almeida, Trevor P.; Muxworthy, Adrian R.; Kovács, András et al.
In: Geophysical Research Letters, Vol. 43, No. 16, 2016, p. 8426-8434.

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

TY - JOUR

T1 - Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders

T2 - Thermal Demagnetization of Vortex States

AU - Almeida, Trevor P.

AU - Muxworthy, Adrian R.

AU - Kovács, András

AU - Williams, Wyn

AU - Nagy, Leslei

AU - Conbhuí, Pádraig O.

AU - Frandsen, Cathrine

AU - Supakulopas, Radchagrit

AU - Dunin-Borkowski, Rafal E.

N1 - This is an open access article under the terms of the Creative Commons Attribution License

PY - 2016

Y1 - 2016

N2 - The thermal demagnetization of pseudo-single-domain (PSD) magnetite (Fe3O4) particles, which govern the magnetic signal in many igneous rocks, is examined using off-axis electron holography. Visualization of a vortex structure held by an individual Fe3O4 particle (~250nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Stepwise demagnetization of the remanence-induced Fe3O4 particle upon heating to above the Curie temperature, performed in a similar fashion to bulk thermal demagnetization measurements, revealed that its vortex state remains stable under heating close to its unblocking temperature and is recovered upon cooling with the same or reversed vorticity. Hence, the PSD Fe3O4 particle exhibits thermomagnetic behavior comparable to a single-domain carrier, and thus, vortex states are considered reliable magnetic recorders for paleomagnetic investigations.

AB - The thermal demagnetization of pseudo-single-domain (PSD) magnetite (Fe3O4) particles, which govern the magnetic signal in many igneous rocks, is examined using off-axis electron holography. Visualization of a vortex structure held by an individual Fe3O4 particle (~250nm in diameter) during in situ heating is achieved through the construction and examination of magnetic-induction maps. Stepwise demagnetization of the remanence-induced Fe3O4 particle upon heating to above the Curie temperature, performed in a similar fashion to bulk thermal demagnetization measurements, revealed that its vortex state remains stable under heating close to its unblocking temperature and is recovered upon cooling with the same or reversed vorticity. Hence, the PSD Fe3O4 particle exhibits thermomagnetic behavior comparable to a single-domain carrier, and thus, vortex states are considered reliable magnetic recorders for paleomagnetic investigations.

U2 - 10.1002/2016GL070074

DO - 10.1002/2016GL070074

M3 - Journal article

C2 - 27867236

SN - 0094-8276

VL - 43

SP - 8426

EP - 8434

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 16

ER -

Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders: Thermal Demagnetization of Vortex States

Abstract

Bibliographical note

Access to Document

OpenUrl availability

Fingerprint

Cite this