磁性石榴石薄膜的磁力显微镜研究

Studies of Magnetic Garnet using Magnetic Force Microscope

本文采用磁力显微镜（ＭＦＭ）对磁性石榴石（ＹＧｄＢｉ）３（ＧａＦｅ）５Ｏ１２薄膜的磁畴结构进行了观察研究。实验结果表明，磁性针尖的磁特性对石榴石ＭＦＭ图像的影响较大，而且随着针尖与样品间距的增大，磁针尖对石榴石畴结构的影响有所降低。另外，改变针尖的磁化方向，得到的石榴石磁畴结构也有所不同。

The magnetic tips dependence of the magnetic domains in low coercivity magnetic (YGdBi)3(GaFe)_5O_12 garnet was investigated using magnetic force microscopy.With a soft magnetic tip,we obtained dark and bright stripes with same widths representing domains with opposite magnetization.However,the stray field emanating from a hard tip magnetized the garnet and changed the widths of magnetic bright domains.By chosing appropriate tipsample distance and the tip magnetization,the influence of hard tip can be minimized.