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Modeling an oblique anhysteretic remanent magnetization using low-temperature and alternating-field demagnetizations.

使用低温和交变场退磁对倾斜非磁滞剩磁进行建模。

基本信息

批准号：
15540407
负责人：
TSUNAKAWA Hideo
金额：
$ 1.86万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540407/
关键词：
Paleomagnetism Rock magnetism Anhysteretic remanent magnetization Thermoremanent magnetization Single-domain particle Multi-domain particle Coercivity force Low-temperature demagnetization ARM SD MD 交流消磁 PSD

项目摘要

Anhysteretic remanent magnetization(ARM) is normally imparted applying a dc field parallel to alternating field(AF), that is ‘parallel ARM'. In this study we have experimentally investigated oblique ARM(OARM) which is given under the condition of a dc field oblique to or perpendicular to AF. We have modeled its acquisition mechanism and suggest its application to the paleomagnetic study. The results obtained in this study will be summarized as follows.(1)Device for parallel, perpendicular and oblique ARMsOrthogonality of two-axis dc fields for OARM is better than 0.5 deg.Linearity of dc field intensity vs. current is confirmed with very high precision.(2)Measurement of bulk OARMOARM intensity is linearly acquired with applied dc fields in range of 10-100 micro T.Intensity :Parallel ARM>Oblique ARM>Perpendicular ARMAddivity law of OARM :OARM(AF;DC1,DC2;Hc1,Hc2)=OARM(AF;DC1,0;Hc1,Hc2)+OARM(AF;0,DC2;Hc1,Hc2) DC1:Dc field by Coil-1,DC2:Dc field by Coil-2,He:coercivity forceUni-axis AF demagnetization curve is almost the reverse of ARM acquisition curve.Low temperature demagnetization(LTD) :LTD components (multi-domain particle origin) show a direction parallel to the applied dc field.LT memory (single-and pseudo-single-domain particle origin) does not show a parallel direction.(3)Modeling OARM acquisitionIt is suggested that the observed characteristics of OARM can be explained with the shape-anisotropy model of SD particles and the domain-wall model of MD particles.(4)Application of OARMIt is thought that OARM has a potential for evaluation of SD, PSD and MD components.OARM can be used in the LTD-DHT Shaw method in the absolute paleointensity determination.

非滞回剩磁（ARM）通常是应用一个直流场平行于交变场（AF），即“并行ARM”。本文对斜向或垂直于AF的直流电场条件下的斜向ARM（OARM）进行了实验研究，建立了其获取机制模型，并提出了其在古地磁研究中的应用。本研究的结果将总结如下。(1)平行、垂直和斜向armarm装置，两轴直流磁场的正交性优于0.5度，直流场强与电流的线性关系得到了高精度的证实。(2)在10-100微t范围内施加直流电场，线性获取OARMOARM体强度测量值。强度：平行ARM>斜向ARM>垂直ARM。OARM的可加性规律：OARM(AF;DC1,DC2;Hc1,Hc2)=OARM(AF;DC1,0;Hc1,Hc2)+OARM(AF;0,DC2;Hc1,Hc2) DC1: dc场by Coil-1，DC2: dc场by Coil-2，He：矫顽力单轴AF退磁曲线几乎与ARM采集曲线相反。低温退磁（LTD）：LTD分量（多域粒子原点）呈现与外加直流场平行的方向。LT记忆（单域和伪单域粒子原点）不显示平行方向。(3) OARM获取的建模研究表明，OARM的观测特征可以用SD粒子的形状各向异性模型和MD粒子的畴壁模型来解释。(4) OARMIt的应用认为OARM在SD、PSD和MD组分的评价中具有潜力。OARM可用于LTD-DHT Shaw法测定绝对古强度。