Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite

doi:10.1016/j.pepi.2008.07.008

	Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite
	Liu, Qingsong 1,2; Yu, Yongjae 3; Muxworthy, Adrian R.4; Roberts, Andrew P.2
刊名	PHYSICS OF THE EARTH AND PLANETARY INTERIORS
	2008-08-01
卷号	169 期号:1-4 页码:100-107
关键词	Verwey transition Magnetite Internal stress AF demagnetization Closure domain
ISSN号	0031-9201
DOI	10.1016/j.pepi.2008.07.008
文献子类	Article
英文摘要	The magnetic properties of magnetite (Fe(3)O(4)) are strongly dependent on the internal stress related to stress-controlled regions and to closure domains associated with defects. The contribution of internal stress to the low-temperature magnetic properties of magnetite was tested using annealed and unannealed multi-domain (MD) magnetites. During low-temperature cooling. a room temperature-induced saturation isothermal remanent magnetization (SIRM) increased abruptly at the Verwey transition (T(v) similar to 122 K). In particular, the absolute intensity jump (delta(VJ), defined as the jump in SIRM at T(v) upon cooling) resulted from the high-coercivity fraction of MD grains. We observe that annealing significantly reduces internal stress and thus decreases the average microcoercivity. Comparison of the alternating field (AF) demagnetization spectra of delta(VJ) both for annealed and unannealed magnetites directly links delta(VJ) to the internal stress. It is likely that removal of the closure domain associated with stress-controlled regions was dominant when the peak AF was less than the average micromagnetic coercivity (h(c)), resulting in a net increase of delta(VJ) with increasing AF. However, when the AF exceeded the (h(c)) threshold, delta(VJ) decreased because the stress-controlled regions were demagnetized. Such observations could therefore be useful for estimating the < h(c)> of MD magnetite. (C) 2008 Published by Elsevier B.V.
WOS关键词	SINGLE-DOMAIN MAGNETITE ; LOW-TEMPERATURE ; COERCIVE FORCE ; GRAIN-SIZE ; HYSTERESIS ; MAGNETIZATION ; DEMAGNETIZATION ; DEPENDENCE ; MICROCOERCIVITY ; REVERSAL
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000260648700011
资助机构	Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSFC(40221402) ; NSFC(40221402) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSFC(40221402) ; NSFC(40221402) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSFC(40221402) ; NSFC(40221402) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; NSFC(40221402) ; NSFC(40221402)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69200]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu, Qingsong
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Paleomagnetism & Geochronol Lab SKL LE, Beijing 100029, Peoples R China 2.Univ Southampton, Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England 3.Chungnam Natl Univ, Dept Geol & Earth Environm Sci, Taejon 305764, South Korea 4.Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England
推荐引用方式 GB/T 7714	Liu, Qingsong,Yu, Yongjae,Muxworthy, Adrian R.,et al. Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2008,169(1-4):100-107.
APA	Liu, Qingsong,Yu, Yongjae,Muxworthy, Adrian R.,&Roberts, Andrew P..(2008).Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,169(1-4),100-107.
MLA	Liu, Qingsong,et al."Effects of internal stress on remanence intensity jumps across the Verwey transition for multi-domain magnetite".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 169.1-4(2008):100-107.