Measurement of the Crystalline Anisotropy Constant of Titanomagnetite

磁晶各向异性和磁致伸缩是 磁性材料的基本性质，并从 事实上，负责的交换能量 自发磁化的存在是由 晶体中电子云的重叠。 磁晶 各向异性源于磁化能 是相对于晶格的取向的函数。 这导致磁化的“易”和“难”方向， 是控制畴壁宽度的关键参数。 因此，我们必须有准确的测量数据， 如果我们要在这方面取得很大进展， 了解TRM机制。 一个主要问题是， 已知常数随温度变化。 我们尤其 需要居里点附近的温度值，因为这是 剩磁被锁定。 PI将确保测量。 他 将测量x值高达0.8的两个常数， 温度高达居里点。 他的目标是测量 几个x值的磁晶各向异性常数， 在明显高于室温的温度下。 他将 使用一种在岩石磁学中应用有限的技术， 铁磁共振

Magnetocrystalline anisotropy and magnetostriction are fundamental properties of magnetic materials and derive from the fact that the exchange energy which is responsible for the existence of spontaneous magnetization is controlled by the overlap of electron clouds in the crystal. Magnetocrystalline anisotropy derives from the fact that the energy of magnetization is a function of the orientation with respect to the lattice. This leads to "easy" and "hard" directions for magnetization and is a critical parameter controlling the width of domain walls. It is thus clearly important that we have accurate measurements of these parameters if we are to make much progress in our understanding of TRM mechanisms. A major problem is that both constants are known to vary with temperature. In particular, we need values at temperatures near the Curie point as this is where remanence in locked in. The PI will make sure measurements. He will measure both constants for x-values up to 0.8 and temperatures up to the Curie point. His goal is to measure the magnetocrystalline anisotropy constant for several x-values and at temperatures significantly above room temperature. He will use a technique that has seen only limited use in rock magnetism, ferromagnetic resonance.