Manipulation of Coupling and Magnon Transport in Magnetic Metal-Insulator Hybrid Structures
Manipulation of Coupling and Magnon Transport in Magnetic Metal-Insulator Hybrid Structures
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DOI：
10.1103/physrevapplied.13.061002
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发表时间：
2020-06-15
影响因子：
4.6
通讯作者：
Liu, Luqiao
中科院分区：
文献类型：
--
作者：
Fan, Yabin;Quarterman, P.;Liu, Luqiao
铁磁金属和绝缘体被广泛用于产生、控制和检测磁振子自旋信号。大多数磁振子结构主要基于磁性绝缘体或铁磁金属，而集成两者的异质结构较少探索。在这里，通过引入一个Pt/钇铁石榴石（YIG）/坡莫合金（Py）的混合结构生长在Si衬底上，我们研究的磁耦合和磁振子传输通过两个磁性层的界面。我们发现，在这种结构中，Py和YIG表现出强如150 mT的反铁磁耦合场，证明了这两个磁力计和极化中子反射测量。通过控制各层厚度和外场，我们实现了平行和反平行磁化结构，并进一步利用它们来控制磁振子电流传输。我们表明，一个磁振子自旋阀的开：关比约为130%，可以实现了这种多层结构在室温下，通过自旋泵和自旋塞贝克效应实验。Pt/YIG/Py混合结构由于其对磁振子电流的有效控制以及与Si工艺的兼容性，在磁振子逻辑和存储器件中具有潜在的应用前景。
Ferromagnetic metals and insulators are widely used for generation, control, and detection of magnon spin signals. Most magnonic structures are based primarily on either magnetic insulators or ferromagnetic metals, while heterostructures integrating both of them are less explored. Here, by introducing a Pt/yttrium iron garnet (YIG)/permalloy (Py) hybrid structure grown on a Si substrate, we study the magnetic coupling and magnon transmission across the interface of the two magnetic layers. We find that within this structure, Py and YIG exhibit an antiferromagnetic coupling field as strong as 150 mT, as evidenced by both magnetometry and polarized neutron reflectometry measurements. By controlling individual layer thicknesses and external fields, we realize parallel and antiparallel magnetization configurations, which are further utilized to control the magnon current transmission. We show that a magnon spin valve with an on:off ratio of approximately 130% can be realized out of this multilayer structure at room temperature through both spin pumping and spin-Seebeck-effect experiments. Owing to the efficient control of magnon current and the compatibility with Si technology, the Pt/YIG/Py hybrid structure could potentially find applications in magnon-based logic and memory devices.