In the narrower sense of magnetic information storage and processing, the advantages of extending the typically 2D structures into the third dimension for higher integration density have already been realized and have lead to developments such as the racetrack memory 5. Nanomagnetic structures are traditionally planar, but recent work is expanding nanomagnetism into three dimensions and it has been generally recognized that in three-dimensional nanomagnets complex magnetic configurations with unprecedented properties become possible, see 4 for a recent review. Nanomagnetic structures are ubiquitous, as they form the basic functional elements in various applications, such as in magnetic storage and information processing, magnonics and spintronics, see e. Furthermore we show that the magnetic 3D elements can be combined with other 3D elements of different chemical composition and intrinsic material properties. By employing micro-Hall sensing, we have determined the magnetic stray field generated by our free-form structures in an externally applied magnetic field and we have performed micromagnetic and macro-spin simulations to deduce the spatial magnetization profiles in the structures and analyze their switching behavior. Here we demonstrate the direct-write fabrication of freestanding ferromagnetic 3D nano-architectures. Although first proposals have been made to advance into three dimensions (3D), established nanofabrication pathways based on electron beam lithography have not been adapted to obtain free-form 3D nanostructures. This has been accomplished with great success in two dimensions in the fields of artificial spin ice and magnetic logic devices, to name just two. This level of safety is not often found in cheaper products on the market.By the fabrication of periodically arranged nanomagnetic systems it is possible to engineer novel physical properties by realizing artificial lattice geometries that are not accessible via natural crystallization or chemical synthesis. Our tiles are ultrasonically welded, with visible rivets in the corners, ensuring that the magnets are safely encased. While toys with magnets are officially recommended for ages 3 and up, supervised play with younger children is also possible with Imagimags tiles. These sets are designed with complexity in mind. These are: the Construction Set, which requires more dexterity and involves play with small building bricks, and the Marble Run Set, which requires spatial planning and more complex engineering to build. In addition, we offer two sets designed specifically for older children aged 5 and up. All Imagimags sets are suitable for this purpose. When older children are given access to screen-free, open-ended play, they often impress themselves with their imaginative and intricate builds with the creative, complex builds they create, becoming fully immersed in a world of their own imagination. From simple cubes to complex castles, the possibilities are endless. Imagimags sets are designed to appeal to a wide range of ages, from toddlers to pre-teens, as the tiles respond to the creative thinking and fine motor skills of the child playing with them.
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