Origin of PSD Behavior: Magnetic Measurements and Domain Observations of Single Particles

PSD 行为的起源：单粒子的磁测量和域观察

• 批准号: 8817884
• 负责人: Michael Fuller
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1991-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817884&HistoricalAwards=false
• 关键词: Origin; PSD; Behavior; Magnetic; Measurements

This is a collaborative effort between Lamont-Doherty Geological Observatory and UCSB to study the magnetic behavior of pseudosingle domain particles. The work will utilize magnetic measurements on individual particles coupled with domain observations. The magnetic measurements will be extended from remanence measurements to weak field susceptibility and hysteresis determination. The particular topics are the following: 1. Additional tests of the existence of metastable single-domain like states in IRM(s), TRM and VRM. 2. The relationship between temperature dependence of domain structure and the TRM blocking process. 3. The physical nature of nucleation and pinning sites. 4. The role of nucleation in determining the response of PSD material to AF demagnetization. The last topic will lead to the application of new ideas on behavior of PSD particles to the interpretation of NRM.

这是拉蒙特-多尔蒂地质观测站和UCSB之间的合作努力，以研究伪单畴粒子的磁性行为。这项工作将利用对单个粒子的磁性测量以及对畴的观测。磁性测量将从剩磁测量扩展到弱场磁化率和磁滞测定。具体内容如下：1.对双稳态、TRM和VRM中亚稳单畴类状态存在性的附加测试。2.磁畴结构的温度依赖性与TRM阻断过程之间的关系。3.成核和钉扎位置的物理性质。4.成核在决定PSD材料对AF退磁的响应中的作用。最后一个主题将导致PSD粒子的行为的新想法的应用到NRM的解释。