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

这是Lamont-Doherty地质天文台和UCSB合作研究伪单磁区粒子的磁性行为。这项工作将利用对单个粒子的磁测量与区域观测相结合。磁测量将从剩磁测量扩展到弱场磁化率和磁滞测量。具体内容如下：1.对IRM(S)、TRM和VRM中亚稳态单畴类态的存在进行了补充检验。2.磁畴结构的温度依赖性与TRM阻断过程的关系。3.成核和钉扎位置的物理性质。4.成核在决定PSD材料对AF退磁响应中的作用。最后一个主题将导致对PSD粒子行为的新观点应用于对NRM的解释。

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.