Magnetic and Structural Properties of Magnetite in Radular Teeth of Chiton

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	Magnetic and Structural Properties of Magnetite in Radular Teeth of Chiton
	Han, YA ; Liu, CL ; Zhou, D ; Li, FS ; Wang, Y ; Han, XF
刊名	BIOELECTROMAGNETICS
	2011
卷号	32 期号:3 页码:226
关键词	ACANTHOPLEURA-HIRTOSA PLAXIPHORA-ALBIDA POLYPLACOPHORA MINERALIZATION ORGANIZATION MATRIX
ISSN号	0197-8462
通讯作者	Han, YA: Rainlake Area, Peach Garden Rd, Xiangtan 411201, Hunan, Peoples R China.
中文摘要	The teeth of the Polyplacophora Chiton Acanthochiton Rubrolinestus contain biomineralized magnetite crystallites whose biological functions in relation to structure and magnetic properties are not well understood. Here, using superconducting quantum interference device (SQUID) magnetometry, we find that the saturation magnetization (sigma(s)) and the Verwey transition temperature (T-v) of tooth particles are 78.4 emu/g and 105 K, respectively. These values are below those of the stoichiometric magnetite. An in situ examination of the structure of the magnetite-bearing region within an individual tooth using high-resolution transmission electron microscopy indicates magnetite microcrystals form electron-dense polycrystalline sheets with typical lengths of about 800 nm and widths of about 150 nm. These polycrystalline sheets are arranged regularly along the longitudinal direction of the tooth cutting surface. In addition, the crystallites in polycrystalline sheets take on generally good crystallinity. The magnetic microstructures of in situ magnetic force microscopy demonstrate that the [111] easy direction of magnetite microcrystals are aligned along the length of the tooth, whereas the [1 (1) over bar1] direction is parallel to the thickness of the tooth. Both Mossbauer spectra and magnetization versus temperature measurements under field cooled and zero-field cooled conditions do not detect superparamagnetic magnetite crystallites in the mature major lateral tooth particles of this chiton. Bioelectromagnetics 32:226-233, 2011. (C) 2010 Wiley-Liss, Inc.
收录类别	SCI
资助信息	Ministry of Science and Technology (MOST) [2006CB932200]; Chinese National Natural Science Foundation (NSFC) [10574156, 50528101, 50721001]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/41147]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Han, YA,Liu, CL,Zhou, D,et al. Magnetic and Structural Properties of Magnetite in Radular Teeth of Chiton[J]. BIOELECTROMAGNETICS,2011,32(3):226.
APA	Han, YA,Liu, CL,Zhou, D,Li, FS,Wang, Y,&Han, XF.(2011).Magnetic and Structural Properties of Magnetite in Radular Teeth of Chiton.BIOELECTROMAGNETICS,32(3),226.
MLA	Han, YA,et al."Magnetic and Structural Properties of Magnetite in Radular Teeth of Chiton".BIOELECTROMAGNETICS 32.3(2011):226.