| DOI: | 10.1002/2014GL061432
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| 论文题名: | Observing thermomagnetic stability of nonideal magnetite particles: Good paleomagnetic recorders? |
| 作者: | Almeida T.P.; Kasama T.; Muxworthy A.R.; Williams W.; Nagy L.; Dunin-Borkowski R.E.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9688
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| EISSN: | 1944-9419
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| 出版年: | 2014
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| 卷: | 41, 期:20 | | 起始页码: | 7041
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| 结束页码: | 7047
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| 语种: | 英语
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| 英文关键词: | magnetic recorders
; magnetite
; thermomagnetic stability
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| Scopus关键词: | Electron holography
; Holograms
; Magnetic devices
; Magnetite
; Stability
; Vortex flow
; Electron holograms
; magnetic recorders
; Magnetic signatures
; Magnetite particles
; Off-axis electron holography
; Pseudo single domains
; Single domain particles
; Thermally stable
; Magnetic bubbles
; heating
; lithology
; magnetic property
; magnetite
; observational method
; paleomagnetism
; particulate matter
; stabilization
; temperature effect
; vortex
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| 英文摘要: | The thermomagnetic behavior of remanence-induced magnetite (Fe3O4) particles in the pseudo-single-domain (PSD) size range (∼0.1-10-μm), which dominate the magnetic signature of many rock lithologies, is investigated using off-axis electron holography. Construction of magnetic induction maps allowed for the visualization of the vortex domain state in an individual Fe3O4 grain (∼200-nm in diameter) as a function of temperature. Acquisition of a series of electron holograms at 100°C intervals during in situ heating up to 700°C demonstrates the vortex state of the Fe3O4 grain, in this instance, remains thermally stable close to its unblocking temperature and exhibits a similar in-plane remanent state upon cooling; i.e., the particle is effectively behaving like a uniaxial single-domain particle to temperatures near TC. Such particles are thought to be robust magnetic recorders. It is suggested that evidence for PSD behavior should therefore not preclude paleomagnetic investigation. Key Points Thermomagnetic stability of nonideal magnetite particlesVisualization of stability of vortex domain state with heatingParticles behave like uniaxial SD particles near to Curie temperature ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911459685&doi=10.1002%2f2014GL061432&partnerID=40&md5=20aaf5009c38291b146d218034243426
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6952
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth Science and Engineering, Imperial College London, London, United Kingdom
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| Recommended Citation: | |
Almeida T.P.,Kasama T.,Muxworthy A.R.,et al. Observing thermomagnetic stability of nonideal magnetite particles: Good paleomagnetic recorders?[J]. Geophysical Research Letters,2014-01-01,41(20).
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