Possible existence of a new type of left-handed materials in coupled ferromagnetic bilayer films

Possible existence of a new type of left-handed materials in coupled ferromagnetic bilayer films
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耦合铁磁双层薄膜中可能存在新型左手材料

DOI:
10.1016/j.jmmm.2005.09.040
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发表时间:
2006-07
影响因子:
2.7
通讯作者:
--
中科院分区:
材料科学3区
文献类型:
--
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从Landau-Lifshitz-吉尔伯特(LLG)方程出发,详细论证了铁磁共振的反常行为。磁矩间的耦合使其中一个磁矩产生3π/2的相位延迟,从而使磁化率χ η =χ′-jχ″的符号与通常的铁磁共振相反。因此,可以在谐振的低频侧附近形成左手材料(LHM)。特别地,预测了仅磁导率真实的部分为负值的左手材料。
On the basis of Landau–Lifshitz–Gilbert (LLG) equation, an anomalous ferromagnetic resonance behavior is demonstrated in detail. Coupling between the magnetic moments produces a 3π/2 phase delay for one of the moments ferromagnetic resonance unusually, thus leads the sign of magnetic susceptibility χ˜=χ′-jχ″to be opposite to that induced by the usual ferromagnetic resonance. Consequently, a left-handed material (LHM) may be formed near the low-frequency side of the resonance. Particularly, a LHM with negative value of real part of permeability only is predicted.
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