SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Posters Magnetism I

MA 3.9: Poster

Monday, September 27, 2021, 13:30–16:30, P

Magnetic Coupling in YIG/GIG Heterostructures — •Sven Becker¹, Zengyao Ren^1,2,3, Felix Fuhrmann¹, Andrew Ross^1,4, Sally Lord^1,5, Shilei Ding^1,2,6, Rui Wu^1,7, Jinbo Yang⁶, Jun Miao³, Mathias Kläui^1,2,7, and Gerhard Jakob^1,2 — ¹University of Mainz, Germany — ²Graduate School of Excellence ’MAINZ’, Germany — ³USTB, Beijing, China — ⁴Université Paris-Saclay, France — ⁵University of Manchester, UK — ⁶Peking University, China — ⁷University of Trondheim, Norway

We study the magnetic coupling in epitaxial Y₃Fe₅O₁₂/Gd₃Fe₅O₁₂ (YIG/GIG) heterostructures grown by pulsed laser deposition. From bulk sensitive magnetometry and surface sensitive spin Seebeck effect and spin Hall magnetoresistance measurements, we determine the alignment of the heterostructure magnetization as a function temperature and external magnetic field. The ferromagnetic coupling between the Fe sublattices of YIG and GIG dominates the overall behavior of the heterostructures. Because of the temperature-dependent gadolinium moment, a magnetic compensation point of the total bilayer system can be identified. This compensation point shifts to lower temperatures with increasing YIG thickness due the parallel alignment of the iron moments. We show that we can control the magnetic properties of the heterostructures by tuning the thickness of the individual layers, opening up a large playground for magnonic devices based on coupled magnetic insulators. These devices could potentially control the magnon transport analogously to electron transport in giant magnetoresistive devices.