A strong angular dependence of magnetic properties of magnetosome chains: Implications for rock magnetism and paleomagnetism

doi:10.1002/ggge.20228

	A strong angular dependence of magnetic properties of magnetosome chains: Implications for rock magnetism and paleomagnetism
	Li, Jinhua 1,2; Ge, Kunpeng 1,2; Pan, Yongxin 1,2; Williams, Wyn 3; Liu, Qingsong 4; Qin, Huafeng 4
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2013-10-01
卷号	14 期号:10 页码:3887-3907
关键词	magnetosome chain magnetic property angular dependence magnetic anisotropy rock magnetism paleomagnetism
ISSN号	1525-2027
DOI	10.1002/ggge.20228
文献子类	Article
英文摘要	Single-domain magnetite particles produced by magnetotactic bacteria (magnetosomes) and aligned in chains are of great interest in the biosciences and geosciences. Here, we investigated angular variation of magnetic properties of aligned Magnetospirillum magneticum AMB-1 cells, each of which contains one single fragmental chain of magnetosomes. With measurements at increasing angles from the chain direction, we observed that (i) the hysteresis loop gradually changes from nearly rectangular to a ramp-like shape (e. g., B-c and remanence decrease), (ii) the acquisition and demagnetization curves of IRM shift toward higher fields (e. g., B-cr increases), and (iii) the FORC diagram shifts toward higher coercivity fields (e. g., B-c,(FORC) increases). For low-temperature results, compared to unoriented samples, the samples containing aligned chains have a much lower remanence loss of field-cooled (delta(FC)) and zero-field-cooled (delta(ZFC)) remanence upon warming through the Verwey transition, higher delta-ratio (delta = delta(FC)/delta(ZFC)) for the measurement parallel to the chain direction, and lower delta-ratio, larger delta(FC) and delta(ZFC) values for the perpendicular measurement. Micromagnetic simulations confirm the experimental observations and reveal that the magnetization reversal of magnetosome chain appears to be noncoherent at low angles and coherent at high angles. The simulations also demonstrate that the angular dependence of magnetic properties is related to the dispersion degree of individual chains, indicating that effects of anisotropy need to be accounted for when using rock magnetism to identify magnetosomes or magnetofossils once they have been preserved in aligned chains. Additionally, this study experimentally demonstrates an empirical correspondence of the parameter B-c,(FORC) to B-cr rather than B-c, at least for magnetite chains with strong shape anisotropy. This suggests FORC analysis is a good discriminant of magnetofossils in sediments and rocks.
WOS关键词	SINGLE-DOMAIN MAGNETITE ; EOCENE THERMAL MAXIMUM ; ELEMENT MESH QUALITY ; ORGANIC-CARBON FLUX ; MAGNETOTACTIC BACTERIA ; MAGNETOSPIRILLUM-GRYPHISWALDENSE ; FERROMAGNETIC-RESONANCE ; BIOGENIC MAGNETITE ; MAGNETOCRYSTALLINE ANISOTROPY ; JACOBIAN MATRIX
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000330531400001
资助机构	National Natural Science Foundation of China (NSFC)(41004024) ; National Natural Science Foundation of China (NSFC)(41004024) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; National Natural Science Foundation of China (NSFC)(41004024) ; National Natural Science Foundation of China (NSFC)(41004024) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; National Natural Science Foundation of China (NSFC)(41004024) ; National Natural Science Foundation of China (NSFC)(41004024) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; National Natural Science Foundation of China (NSFC)(41004024) ; National Natural Science Foundation of China (NSFC)(41004024) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZCX2-YW-T10) ; China Postdoctoral Science Foundation (CPSC)(201104144) ; China Postdoctoral Science Foundation (CPSC)(201104144)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87228]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, Jinhua
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earths Deep Interior, Paleomagnetism & Geochronol Lab, Beijing, Peoples R China 2.Chinese Acad Sci, China France Biomineralizat & Nanostruct Lab, Beijing, Peoples R China 3.Univ Edinburgh, Grant Inst Earth Sci, Edinburgh, Midlothian, Scotland 4.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Jinhua,Ge, Kunpeng,Pan, Yongxin,et al. A strong angular dependence of magnetic properties of magnetosome chains: Implications for rock magnetism and paleomagnetism[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2013,14(10):3887-3907.
APA	Li, Jinhua,Ge, Kunpeng,Pan, Yongxin,Williams, Wyn,Liu, Qingsong,&Qin, Huafeng.(2013).A strong angular dependence of magnetic properties of magnetosome chains: Implications for rock magnetism and paleomagnetism.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,14(10),3887-3907.
MLA	Li, Jinhua,et al."A strong angular dependence of magnetic properties of magnetosome chains: Implications for rock magnetism and paleomagnetism".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 14.10(2013):3887-3907.