二维单畴磁性颗粒磁化快速翻转特性的研究

The study of the magnetization switching feature of the two-dimensional single domain magnetic particle

用数值模拟法研究了二维无限大单畴磁性薄膜的磁化翻转过程和特性.比较了单轴磁性薄膜和二重轴磁性薄膜的磁化翻转,发现二重轴磁性薄膜比单轴磁性薄膜更有优势.翻转场垂直于磁化初始态且在薄膜平面内时翻转所需的时间比翻转场施加在反平行于薄膜平面内磁化初始态时翻转所需的时间要短得多,而且在磁化翻转过程中垂直于薄膜平面的偏压场发挥着重要作用.翻转场和偏压场对磁化翻转的影响程度会随着阻尼系数α取值不同而呈现此消彼长的变化.

The switching procession and switching features of the infinite two-dimensional single-domain magnetic thin film have been studied by using the numerical simulation method. Comparing the magnetization switching of the uni-axial magnetic thin film with that of the duplicate-axial magnetic thin film, we find that the duplicate-axial mag- netic thin film has more merits. When the switching field is applied in plane and perpendicularly to the initial mag- netization vector the time for magnetization reversal is much shorter than that of the case when the switching field is applied in plane and anti-parallel to the initial magnetization vector. And the bias field applied perpendicularly to the thin film plays an important role in the process of magnetization switching. The influence of the switching field and the bias field for the magnetization switching procession alternates when the the damping constant α varies.