Experimental Micromagnetism of Magnetite and Maghemite

PI建议使用磁力显微镜和磁性测量来研究磁铁矿、磁铁矿和相耦合颗粒的微磁性结构和宏观磁性行为之间的相互关系。磁力显微镜是一种能够在亚微米尺度上对微磁结构进行成像的高分辨率磁袍。用MFM研究的磁性氧化物将使用分子束外延和光刻技术生产。这些先进的微加工技术可以合成单晶、单相和相耦合颗粒，并能精确控制形状、大小和晶体取向。通过这种方式，系统地研究了磁铁矿的伪单畴（PSD）尺寸范围（0.5-10微米）内的本征畴模式、畴壁结构和其他微磁特征作为颗粒尺寸和晶体取向的函数。该实验项目将为理论微磁模型提供关键的实验验证，为相耦合CRM样品的微磁结构和岩石磁性提供新的重要数据，并促进我们对古磁学物理基础的认识。

Moskowitz 9526812 The PI's propose to investigate the interrelation between micromagnetic structure and macroscopic magnetic behavior in magnetite, maghemite, and phase-coupled particles using magnetic force microscopy and magnetic property measurements. The magnetic force microscope (MFM) is a high-resolution magnetic robe that can image micromagnetic structures on a submicron scale. Magnetic oxide articles to be studied with the MFM will be produced using molecular-beam epitaxy and photolithography. These advanced microfabrication techniques can synthesize single crystalline, single phase and phase-coupled particles with precise control over shape, size, and crystallographic orientations. In this way, a systematic study of intrinsic domain patterns, domain wall structures, and other micromagnetic features as a function of particles size and crystallographic orientation within the pseudo-single domain (PSD) size range for magnetite (0.5-10 micrometer) will be accomplished. This experimental program will provide critical experimental testing of theoretical micromagnetic models, provide new and important data on micromagnetic structures and rock magnetic properties of phase-coupled CRM samples, and advance our understanding of the physical basis of paleomagnetism.