Spatially inhomogeneous ultrafast precessional magnetization reversal
Spatially inhomogeneous ultrafast precessional magnetization reversal
复制标题
空间不均匀超快进动磁化反转
DOI：
10.1103/physrevb.68.020402
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发表时间：
2002
影响因子：
3.7
通讯作者：
J. Boeck
中科院分区：
文献类型：
--
作者：
W. Hiebert;L. Lagae;J. Boeck
本文介绍了微结构中准弹道旋进磁开关的空间分辨测量。一种技术被引入到抑制recrystalend域，并允许一个完全均匀的，几乎完美的宏观自旋初始状态。尽管对横向磁场脉冲的进动响应最初在空间上是均匀的，并且可以仿真宏自旋特性，但是仍然发生失相，导致不均匀性和瞬态退磁。当使用由交叉电流线产生的重合纵向和横向脉冲时，这些不均匀性被加剧。这些结果对磁器件中弹道进动开关的可靠性具有重要意义。
Spatially resolved measurements of quasiballistic precessional magnetic switching in a microstructure are presented. A technique is introduced to suppress remanent end domains and allow a completely uniform, almost-perfect-macrospin initial state. Though the precessional response to a transverse magnetic field pulse is initially spatially uniform, and macrospin characteristics can be emulated, dephasing still occurs leading to nonuniformity and transient demagnetization. These nonuniformities are intensified when using coincident longitudinal and transverse pulses created by crossing current wires. The results have implications for the reliability of ballistic precessional switching in magnetic devices.