MAGNETIC AND ACOUSTIC EXCITATIONS IN CONFINED NICKEL NANOWIRES
MAGNETIC AND ACOUSTIC EXCITATIONS IN CONFINED NICKEL NANOWIRES
复制标题
受限镍纳米线中的磁和声激发
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Wehrspohn
中科院分区：
文献类型：
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作者：
Z. K. Wang;M. H. Kuok;S. Ng;H. Fan;D. J. Lockwood;K. Nielsch;R. Wehrspohn
利用布里渊散射研究了Al衬底上1μm厚的Al 2 O3膜中Ni纳米线周期性排列的磁激发和振动激发.在0- 0.4T的横向磁场中，研究了直径为30和40 nm，周期为100 nm的Ni纳米线。p-s偏振光谱具有三个峰，布里渊频率低于20 GHz，并且其强度强烈依赖于所施加的磁场，并且其斯托克斯/反斯托克斯强度比不相等。这些结果表明，这三个峰的起源是磁性的。在p-p极化谱中也观察到Ni填充的Al 2 O3结构上的表面声波，对于直径为30 nm的纳米线样品，其相速度约为3400 m/s。
The magnetic and vibrational excitations of periodic arrays of Ni nanowires, in 1µm- thick Al 2 O 3 membranes on Al substrates, have been investigated by Brillouin scattering. Ni nanowires of 30 and 40 nm diameter and periodicity of 100 nm have been studied in a transverse magnetic field from 0-0.4 T. The p-s polarized spectra feature three peaks, with Brillouin frequencies below 20 GHz, and whose intensities are strongly dependent on the applied magnetic field and whose Stokes/anti-Stokes intensity ratios are unequal. These results indicate that the three peaks are magnetic in origin. A surface acoustic wave on the Ni-filled Al 2 O 3 structures is also observed in p-p polarized spectra, with a phase velocity of about 3400 m/s for the 30nm-diameter nanowire sample.