Development of a 0.5 Tesla AF Demagnetizer

1053399 Coe这笔赠款支持开发一种新型的高磁场能力(0.5-1.0特斯拉)单轴交变磁场(AF)消磁器，以支持岩石和古地磁的研究。该设计将把一个由高磁导率材料制成的磁芯放入一个风冷线圈中，产生一个横向于样品孔的均匀磁场。PI将首先建造一个0.5T的自动对焦系统，然后尝试更具挑战性的1.0T设计。一种成功的设备将产生比现有商业设备上可用的峰值交变磁场高得多的峰值交变磁场(高场5-6倍)，并使许多样品能够退磁，这些样品目前无法通过替代方法进行退磁，而不会产生虚假的初级剩余磁化，特别是含有使用热退磁技术进行化学改变的磁性矿物的岩石。它还将提供通过检查磁剩磁的AF退磁所得的矫顽力分布来表征沉积岩的磁性矿物学的能力。开发的仪器将支持岩石和古地磁学的合作研究。PI将让本科生参与开发工作的某些方面。*

1053399CoeThis grant support the development of a new high magnetic field capable (0.5-1.0 Tesla) single axis Alternating Field (AF) Demagnetizer to support research in rock and paleomagnetism. The design would incorporate a magnetic core, built from high magnetic permeability material, in an air-cooled coil producing a uniform field oriented transverse to the sample bore. The PIs will first build a 0.5 T AF demag system and then will attempt the more challenging 1.0 T design. A successful device will yield a much higher peak alternating field than available on existing commercial devices (a factor of 5-6 higher field) and enable demagnetization of many samples that currently cannot be demagnetized via alternative methods without generating spurious primary remanent magnetizations, particularly rocks that contain magnetic minerals that are chemically altered using thermal demagnetization techniques. It will also offer the ability to characterize the magnetic mineralogy of sedimentary rocks through examination of coercivity distributions derived from AF demagnetization of magnetic remanence. The developed instrument will support collaborative research in rock and paleomagnetism. The PIs will engage undergraduates in some aspects of the development effort.***