Experimental Micromagnetism of Magnetite and Maghemite

莫斯科维茨9526812 PI建议使用磁力显微镜和磁性测量来研究磁铁矿、磁赤铁矿和相耦合颗粒中微观磁性结构和宏观磁性行为之间的相互关系。 磁力显微镜（MFM）是一种高分辨率的磁长袍，可以在亚微米尺度上成像微磁性结构。 磁性氧化物的文章将研究与MFM将使用分子束外延和光刻生产。 这些先进的微加工技术可以合成单晶，单相和相耦合的颗粒，精确控制形状，尺寸和晶体取向。 以这种方式，本征域图案，畴壁结构，和其他微磁性功能的函数的颗粒尺寸和晶体取向内的伪单畴（PSD）尺寸范围内的磁铁矿（0.5-10微米）的系统研究将完成。 该实验计划将提供理论微磁模型的关键实验测试，提供新的和重要的数据微磁结构和岩石磁性的相位耦合CRM样品，并推进我们对古地磁的物理基础的理解。

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.