晶格匹配衬底上NiFe $_2$ O $_4$薄膜中增强的磁振子自旋输运
Enhanced magnon spin transport in NiFe$_2$O$_4$ thin films on a lattice-matched substrate
摘要：
我们研究了在镓酸镁尖晶石（MgGa $_2$ O $_4$，MGO）衬底上外延生长的镍铁氧体（NiFe $_2$ O $_4$，NFO）薄膜中的磁振子自旋输运，该薄膜与NFO的晶格失配小至0.78%，导致反相边界缺陷的减少，从而改善了NFO薄膜的磁性能.在非定域输运实验中，增强的信号被观察到的电和热激发的磁振子，和磁振子弛豫长度（$λ_m$）的NFO被发现在室温下约为2.5 $μ$ m。此外，在室温和低温下，我们提出了不同的功能，从非本地自旋Seebeck信号所产生的磁振子极化子的形成。我们的研究结果表明，良好的磁振子输运性能（磁振子自旋电导率，$λ_m$和自旋混合电导之间的Pt之间的界面）的NFO薄膜生长在晶格匹配的衬底上，是与钇铁石榴石。
英文摘要：
We investigate magnon spin transport in epitaxial nickel ferrite (NiFe$_2$O$_4$, NFO) films grown on magnesium gallate spinel (MgGa$_2$O$_4$, MGO) substrates, which have a lattice mismatch with NFO as small as 0.78%, resulting in the reduction of antiphase boundary defects and thus in improved magnetic properties in the NFO films. In the nonlocal transport experiments, enhanced signals are observed for both electrically and thermally excited magnons, and the magnon relaxation length ($λ_m$) of NFO is found to be around 2.5 $μ$m at room temperature. Moreover, at both room and low temperatures, we present distinct features from the nonlocal spin Seebeck signals which arise from magnon polaron formation. Our results demonstrate excellent magnon transport properties (magnon spin conductivity, $λ_m$ and spin mixing conductance at the interface between Pt) of NFO films grown on a lattice-matched substrate that are comparable with those of yttrium iron garnet.
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