Investigation of non-reciprocal magnon propagation using lock-in thermography
Investigation of non-reciprocal magnon propagation using lock-in thermography
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使用锁定热成像研究非互易磁振子传播
DOI：
10.1088/1361-6463/aa5d24
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
G. Schmidt
中科院分区：
文献类型：
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作者：
O. Wid;J. Bauer;A. Müller;O. Breitenstein;S. Parkin;G. Schmidt
利用锁相热成像技术（LIT）研究了200 nm钇铁石榴石（YIG）薄膜中的单向自旋波热传输效应。这源于磁振子的非互易传播，这导致了不对称的热输运。为了激发自旋波，我们使用两种不同的天线几何形状：共面波导（CPW）或YIG顶部的“微带”状天线。通过使用CPW和比较Damon-Eshbach和后向体积模式的结果，我们能够表明，起源的不对称的热分布确实是非互易的自旋波。使用“微带”状的几何形状，我们可以确认这些结果，我们甚至可以观察到一个独特的激励分布沿着天线由于小的场不均匀性。
We have investigated the unidirectional spin wave heat conveyer effect in a 200 nm thin yttrium iron garnet (YIG) film using lock-in thermography (LIT). This originates from the non-reciprocal propagation of magnons, which leads to an asymmetric heat transport. To excite the spin waves we use two different respective antenna geometries: a coplanar waveguide (CPW) or a ‘microstrip’-like antenna on top of the YIG. By using the CPW and comparing the results for the Damon–Eshbach and the backward volume modes we are able to show that the origin of the asymmetric heat profile are indeed the non-reciprocal spin waves. Using the ‘microstrip’-like geometry we can confirm these results and we can even observe a distinct excitation profile along the antenna due to small field inhomogeneities.