Nonstationary behavior of a high-spin molecule in a bifrequency alternating current magnetic field
Nonstationary behavior of a high-spin molecule in a bifrequency alternating current magnetic field
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DOI：
10.1103/physreva.66.013407
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发表时间：
2002-07
影响因子：
2.9
通讯作者：
I. D. Tokman;G. A. Vugalter
中科院分区：
文献类型：
--
作者：
I. D. Tokman;G. A. Vugalter
考虑了高自旋分子与双频交流磁场的相互作用，这种相互作用发生的时间比分子弛豫时间短得多。分子受到垂直于分子易各向异性轴的直流磁场的作用。双频交流场是两个交流场的叠加，其中一个垂直于易各向异性轴，导致基态和第一激发双态的低态之间的共振跃迁。另一个交流场平行于易各向异性轴，其频率远小于第一个交流场的频率。结果表明，第一，分子可以吸收或发射能量，这取决于低频交流场的频率；第二，双频交流磁场以拉比频率诱导分子磁化的隧穿。讨论了观测预报效果的条件。
An interaction of a high-spin molecule with a bifrequency ac magnetic field, occurring at times much shorter than the molecule relaxation times, has been considered. The molecule is subjected to a dc magnetic field perpendicular to the easy anisotropy axis of the molecule. The bifrequency ac field is a superposition of two ac fields, one of which is perpendicular to the easy anisotropy axis and causes resonant transitions between the lower states of the fundamental and first excited doublets. The other ac field is parallel to the easy anisotropy axis and has a frequency much smaller than the frequency of the first ac field. It has been shown that, first, the molecule can absorb or emit energy, depending on the frequency of the low-frequency ac field, second, the bifrequency ac magnetic field induces tunneling of the molecule magnetization with the Rabi frequency. The conditions of observation of the effects predicted are discussed.