globalchange  > 科学计划与规划
DOI: 10.1002/2016GL070074
论文题名:
Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders
作者: Almeida T.P.; Muxworthy A.R.; Kovács A.; Williams W.; Nagy L.; Conbhuí P.Ó.; Frandsen C.; Supakulopas R.; Dunin-Borkowski R.E.
刊名: Geophysical Research Letters
ISSN: 0094-8716
EISSN: 1944-8447
出版年: 2016
卷: 43, 期:16
起始页码: 8426
结束页码: 8434
语种: 英语
英文关键词: magnetite ; paleomagnetism ; thermal demagnetization
Scopus关键词: Demagnetization ; Electron holography ; Geomagnetism ; Igneous rocks ; Magnetic bubbles ; Magnetism ; Magnetite ; Direct observations ; Magnetic signals ; Magnetic vortices ; Off-axis electron holography ; Paleomagnetism ; Pseudo single domains ; Thermal demagnetization ; Vortex structures ; Vortex flow
英文摘要: 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 (~250 nm 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. ©2016. The Authors.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982291288&doi=10.1002%2f2016GL070074&partnerID=40&md5=b14e0bc09df482db3bbf29fba6ac928e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9679
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London, United Kingdom

Recommended Citation:
Almeida T.P.,Muxworthy A.R.,Kovács A.,et al. Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders[J]. Geophysical Research Letters,2016-01-01,43(16).
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