globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.08.027
Scopus记录号: 2-s2.0-85054079304
论文题名:
Magnetic vortex effects on first-order reversal curve (FORC) diagrams for greigite dispersions
作者: Valdez-Grijalva M.A.; Muxworthy A.R.; Williams W.; Ó Conbhuí P.; Nagy L.; Roberts A.P.; Heslop D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501
起始页码: 103
结束页码: 111
语种: 英语
英文关键词: FORC diagram ; greigite ; micromagnetic ; single vortex
Scopus关键词: Dispersions ; Graphic methods ; Magnetic domains ; Magnetic hysteresis ; Magnetization ; Particle size ; Quantum optics ; Vortex flow ; First-order reversal curve diagrams ; FORC diagrams ; Greigites ; Magnetic-domain state ; Micromagnetic calculations ; Micromagnetics ; Single vortices ; Vortex annihilation ; Iron compounds
英文摘要: First-order reversal curve (FORC) diagrams are used increasingly in geophysics for magnetic domain state identification. The domain state of a magnetic particle is highly sensitive to particle size, about which FORC diagrams provide valuable information. However, the FORC signal of particles with nonuniform magnetisations, which are the main carrier of natural remanent magnetisations in many systems, is still poorly understood. In this study, the properties of non-interacting, randomly oriented dispersions of greigite (Fe3S4) in the uniform single-domain (SD) to non-uniform single-vortex (SV) size range are investigated via micromagnetic calculations. Signals for SD particles (<50nm) are found to be in excellent agreement with previous SD coherent-rotation studies. A transitional range from ∼50nm to ∼80nm is identified for which a mixture of SD and SV behaviour produces complex FORC diagrams. Particles >∼80nm have purely SV behaviour with the remanent state for all particles in the ensemble in the SV state. It is found that for SV ensembles the FORC diagram provides a map of vortex nucleation and annihilation fields and that the FORC distribution peak should not be interpreted as the coercivity of the sample, but as a vortex annihilation field on the path to saturation. © 2018 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109671
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Instituto Mexicano del Petróleo07730, Mexico; Department of Earth Science and Engineering, Imperial College LondonSW7 2BP, United Kingdom; School of GeoSciences, University of EdinburghEH9 3FE, United Kingdom; Research School of Earth Sciences, Australian National UniversityACT 2601, Australia; Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, CA 92093, United States; Research Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology305-8567, Japan

Recommended Citation:
Valdez-Grijalva M.A.,Muxworthy A.R.,Williams W.,et al. Magnetic vortex effects on first-order reversal curve (FORC) diagrams for greigite dispersions[J]. Earth and Planetary Science Letters,2018-01-01,501
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