Spin-wave propagation through a magnonic crystal in a thermal gradient

Spin-wave propagation through a magnonic crystal in a thermal gradient
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自旋波在热梯度中穿过磁振子晶体的传播

DOI:
10.1088/1361-6463/aad2ac
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发表时间:
2018
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
V.I. Vasyuchka
V.I. Vasyuchka
中科院分区:
--
文献类型:
--
作者:
T. Langner;D.A. Bozhko;S.A. Bunyaev;G.N. Kakazei;A.V. Chumak;A.A. Serga;B. Hillebrands;V.I. Vasyuchka

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磁振子晶体的性质预计会受到热梯度存在的强烈影响。研究了在连续空间温度梯度作用下一维磁振子晶体中后向体静磁自旋波和表面静磁自旋波的传播。结果表明,施加沿着传播方向的热梯度导致的频率偏移和修改的自旋波的传输特性。频率偏移是由绝对温度变化引起的饱和磁化强度变化引起的。改变的透射率表现为MC带隙的加宽和MC通带的相应变窄,并且被理解为是热梯度中自旋波波长的空间变换的结果。此外,自旋波在热梯度中的传输特性已通过数值计算的基础上的传输矩阵的方法进行了验证。计算结果表明,与实验测量数据吻合良好。
The properties of a magnonic crystal are expected to be strongly influenced by the presence of a thermal gradient. We investigated the propagation of backward volume and surface magnetostatic spin-waves in a 1D magnonic crystal (MC) exposed to a continuous spatial temperature gradient. It is shown that the thermal gradient applied along the propagation direction leads to a frequency shift and a modification of the transmission characteristics of the spin-waves. The frequency shift is caused by a variation in saturation magnetization due to the change in absolute temperature. The altered transmission manifests itself in a broadening of MC band gaps and the corresponding narrowing of the MC passbands and is understood to be a result of a spatial transformation of the spin-waves wavelengths in a thermal gradient. Furthermore, the transmission characteristics of spin-waves in a thermal gradient have been verified by numerical calculations based on the approach of the transmission matrix. The results of the calculations demonstrate a good agreement with the experimentally measured data.
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