Standing spin waves in perpendicularly magnetized circular dots at millimeter waves
Standing spin waves in perpendicularly magnetized circular dots at millimeter waves
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DOI：
10.1063/1.4799528
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发表时间：
2013-04
影响因子：
3.2
通讯作者：
S. Nedukh;S. Tarapov;D. P. Belozorov;A. Kharchenko;V. Golub;I. V. Kilimchuk;O. Salyuk;E. Tartakovskaya;S. Bunyaev;G. Kakazei
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文献类型：
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作者：
S. Nedukh;S. Tarapov;D. P. Belozorov;A. Kharchenko;V. Golub;I. V. Kilimchuk;O. Salyuk;E. Tartakovskaya;S. Bunyaev;G. Kakazei
用铁磁共振技术测量了40 nm厚、半径为250 nm的垂直磁化的坡莫合金圆点在70-80 GHz（4.2 K）和10 GHz（室温）的自旋波谱。在两个频率范围内都观察到五个尖锐的共振峰。共振场可以很好地描述了磁交换色散关系，这意味着所观察到的共振对应于圆形的“鼓面”模式与贝塞尔函数的配置文件。不同频率范围内相邻峰间的相对距离几乎相同，而毫米波范围内的绝对峰间距离比10 GHz时大约30%。
Spin wave spectra of 40-nm thick perpendicularly magnetized circular Permalloy dots of 250 nm radius were measured using ferromagnetic resonance technique in 70-80 GHz range at 4.2 K and in 10 GHz at room temperature. The five sharp resonance peaks were observed for both frequency ranges. The resonance fields can be well described by a magneto-exchange dispersion relation, implying that the observed resonances correspond to circular “drumhead” modes with Bessel-function profiles. The relative distances between neighbor peaks for different frequency ranges were almost the same, while the absolute interpeak distances in millimeter range were ∼30% bigger than at 10 GHz, as predicted by the theory.