Magnetic Measurements of Single Crystals of Titanomagnetites

PI将测量合成钛磁体单晶中室温以上磁致伸缩和磁晶各向异性常数的热依赖关系。在劳伦斯利弗莫尔国家实验室的晶体生长设施中，将在弧形成像炉中通过浮区技术从熔体中生长单晶。单晶工作将补充多晶样品中磁致伸缩的热依赖关系的工作。富钛钛磁铁矿在室温以上的磁晶各向异性与温度的关系没有这样的测量。这些基本常数的热依赖关系对于热剩余磁化、矫顽力和域态的热依赖关系的理论是重要的。

The PI will measure the thermal dependence of magnetostriction and magnetocrystalline anistrophy constants above room-temperature in synthetic single crystals of titanomagnetites. Single crystals will be grown from the melt by the floating zone technique in an arc image furnace at the crystal growth facility at Lawrence Livermore National Laboratory. The single crystal work will complement work on the thermal dependence of magnetostriction in polycrystalline Samples. There are no such measurements for the thermal dependence of magnetocrystalline anisotropy above room- temperature for titanium-rich titanomagnetites. The thermal dependence of these fundamental constants is important for theories of thermoremanent magnetization, coercivity, and thermal dependence of domain states.