Fully controlled precessional switching of a macrospin in a cross-wire geometry
Fully controlled precessional switching of a macrospin in a cross-wire geometry
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交叉线几何中宏自旋的完全受控进动切换
DOI：
10.1063/1.1543885
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Boeck
中科院分区：
文献类型：
--
作者：
W. Hiebert;L. Lagae;J. Das;J. Bekaert;R. Wirix;J. Boeck
超快扫描克尔显微镜测量半旋进周期，准弹道磁化翻转在坡莫合金™宏观自旋。将20×7 μm2、15 nm的椭圆形单元嵌入到一层较薄的Py连续膜中，有效地消除了束缚态封闭畴，大大提高了大单元中动力学运动的相干性。一个垂直的交叉线的几何形状允许脉冲激励的容易和困难的轴。数据以及终止，振铃抑制弹道开关和不良终止开关振铃与硬轴脉冲小至12 Oe和短至400 ps的驱动进动开关。随着增加的易轴重叠脉冲，半选择进动切换到亚稳态观察，然而，大的空间不均匀性引入到元素的动态，这最终击败了半选择切换过程。
Ultrafast scanning Kerr microscopy measurements of half-precession-cycle, quasiballistic magnetization switching in a Permalloy™ macrospin are presented. The 20×7 μm2, 15-nm ellipse-shaped element is embedded in a continuous film of thinner Py, which effectively eliminates the remanent state closure domains and strongly increases coherence of dynamic motions in the large element. A perpendicular crossing-wire geometry allows pulse excitations to both the easy and hard axes. Data for well-terminated, ringing-suppressed ballistic switching and poorly-terminated switching with ringing are presented with hard axis pulses as small as 12 Oe and as short as ∼400-ps driving precessional switching. With addition of an easy-axis overlapping pulse, half-select precessional switching into a metastable state is observed; however, large spatial nonuniformities are introduced into the element dynamics, which ultimately defeat the half-select switching process.