Control of the orientation and size of magnetic domain structures is crucial for the proper functioning of various magneto-optical devices. Here we propose and demonstrate garnet-based heterostructures that allow stabilization of in-plane stripe domain orientation and period under certain conditions. This was achieved using a 5-$\mu \mathrm{m}$-thick epitaxial garnet layer covered with one-dimensional ferromagnetic metal gratings. Using optical polarization microscopy, we show that the interaction between the garnet film and Co/Au or (Co/Pt)${}_{10}$ gratings (with thicknesses on the order of tens of nanometers and periods close to the intrinsic domain width) leads to two key effects: (1) deviation of the stripe domains' orientation from the applied magnetic field direction toward the metal grating and (2) fixation of the stripe domain period within a specific range of external magnetic fields. Second harmonic generation microscopy confirms that this pinning effect is homogeneous throughout the entire thickness of the garnet film. These findings open opportunities for precise control over both domain orientation and width, thereby enhancing the stability of functional magneto-optical heterostructures.

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• Magnetic interactions
• Magneto-optics
• Micromagnetism