超导薄膜的巨退磁效应
Giant demagnetization effects induced by superconducting films
摘要：
研究表明，由于超导体对杂散磁场的Meissner屏蔽作用，面内磁化的铁磁（F）板夹在两层超导（S）膜之间时，会产生强烈的退磁效应.在极端情况下，S膜从正常状态到超导状态的转变可以将退磁因子从0切换到1，这与S/F双层形成鲜明对比，在S/F双层中，这种转变仅轻微地影响F膜内部的磁场。巨大的退磁效应被证明是对超导膜厚度的减少定性鲁棒性，并可能提供一个线索，对最近观察到的S/F/S结构的巨大的铁磁共振频移的解释[I. A. Golovchanskiy，N. N.阿布拉莫夫斯托利亚罗夫Chichkov，M.西拉耶夫岛V. Shchetinin，A. A. Golubov，V. V. Ryazanov，A. V. Ustinov和M. Yu. Kuprianov，Phys.Rev.Appl.14，024086（2020）]。
英文摘要：
We show that a ferromagnetic (F) slab with the in-plane magnetization sandwiched between two superconducting (S) films experiences strong demagnetization effect due to the Meissner screening of the stray magnetic field by the superconductors. In the extreme case the transition of the S films from normal to the superconducting state can switch the demagnetization factor from 0 to 1 which is in a sharp contrast with the S/F bilayers where such transition affects the magnetic field inside the F film only slightly. The giant demagnetization effect is shown to be qualitatively robust against the decreasing of the superconducting film thickness and may provide a hint towards the explanation of the anomalously large ferromagnetic resonance frequency shift recently observed for the S/F/S structures [I. A. Golovchanskiy, N. N. Abramov, V. S. Stolyarov, V. I. Chichkov, M. Silaev, I. V. Shchetinin, A. A. Golubov, V. V. Ryazanov, A. V. Ustinov, and M. Yu. Kuprianov, Phys. Rev. Appl. 14, 024086 (2020)].
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