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Manipulation of Coupling and Magnon Transport in Magnetic Metal-Insulator Hybrid Structures



Yabin Fan, Patrick Quarterman, Joseph Finley, Jiahao Han, Pengxiang Zhang, Justin T. Hou, Mark D. Stiles, Alexander Grutter, Luqiao Liu


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 explored1-5. Here, by introducing a Pt/yttrium iron garnet (YIG)/permalloy (Py) hybrid structure grown on Si substrate, we studied the magnetic coupling and magnon transmission across the interface of the two magnetic layers. We found that within this structure, Py and YIG exhibit an antiferromagnetic coupling field as strong as 150 mT, as evidenced by both the vibrating-sample 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 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.
Physical Review Applied


Magnetism, spintronics, magnons, thin film growth


Fan, Y. , Quarterman, P. , Finley, J. , Han, J. , Zhang, P. , Hou, J. , Stiles, M. , Grutter, A. and Liu, L. (2020), Manipulation of Coupling and Magnon Transport in Magnetic Metal-Insulator Hybrid Structures, Physical Review Applied, [online], (Accessed June 17, 2024)


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Created June 14, 2020, Updated October 12, 2021