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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 Ren1,2,3, Felix Fuhrmann1, Andrew Ross1,4, Sally Lord1,5, Shilei Ding1,2,6, Rui Wu1,7, Jinbo Yang6, Jun Miao3, Mathias Kläui1,2,7, and Gerhard Jakob1,21University 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.

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