Coherent suppression of magnetic ringing in microscopic spin valve elements
Coherent suppression of magnetic ringing in microscopic spin valve elements
复制标题
微观自旋阀元件中磁振的相干抑制
DOI：
10.1063/1.1480476
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发表时间：
2002
影响因子：
4
通讯作者：
M. Bauer
中科院分区：
文献类型：
--
作者：
H. Schumacher;C. Chappert;P. Crozat;R. Sousa;P. Freitas;M. Bauer
我们证明了超短磁场脉冲衰变后，微观自旋阀元件中磁进动的相干抑制。通过测量超短磁场脉冲(脉长0.2~4 ns)的磁输运响应，研究了1 μm×4 μm宽的巨磁电阻器件的磁化动力学。在垂直于脉冲场的静电场的影响下，脉冲开始后和脉冲终止时都观察到明显的磁进动。通过使有效脉冲长度与进动周期相适应，可以有效地抑制脉冲衰减(振铃)之后的进动。
We demonstrate the coherent suppression of magnetic precession in microscopic spin valve elements after the decay of ultrashort magnetic field pulses. The magnetization dynamics in 1 μm×4 μm wide giant magnetoresistance devices are studied by measuring the magnetotransport response to ultrashort magnetic field pulses (pulse length 0.2–4 ns). Under the influence of a static field perpendicular to the pulsed field, pronounced magnetic precession is observed after the onset of the pulse as well as upon pulse termination. The precession after the pulse decay (“ringing”) can be effectively suppressed by adapting the effective pulse length to the precession period.