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Home » Insights

Researchers develop 3D printed Magnets

Insights By AM Chronicle EditorJanuary 8, 20224 Mins Read
Researchers develop 3D printed Magnets
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An international team of scientists led by Cambridge University’s Cavendish Laboratory has used 3D printing technology to develop a novel set of microscopic nanomagnets.

Created using a custom 3D printing process, the nanomagnets are in the shape of a DNA-inspired double helix. According to the research team, this unconventional structure lends itself to strong magnetic field interactions between the helices in a manner never seen before. Specifically, by twisting around one another, the 3D printed helices produce nanoscale topological textures in the magnetic field they generate.

The team believes it can harness this phenomenon to closely control magnetic forces at the nanoscale, paving the way for ‘next generation’ magnetic devices.

The new ability to pattern the magnetic field at this length scale allows us to define what forces will be applied to magnetic materials and to understand how far we can go with patterning these magnetic fields. If we can control those magnetic forces on the nanoscale, we get closer to reaching the same degree of control as we have in two dimensions.”

The limitations of 2D magnetic systems

Though you may not realize it, magnetic devices are integral to many different parts of our lives. Magnets are used in energy generation applications, they’re used in data storage, and they’re crucial for day-to-day computing.

Unfortunately, conventional computing devices are rapidly reaching their miniaturization limits as they’re based on 2D magnetic systems. As such, to advance computing and data storage, the Cambridge team states that there’s growing interest in transitioning to 3D magnetic systems. Using 3D nanowire architectures, 3D magnetic systems can lend themselves to higher information densities (more storage with less physical space) and overall improved performance.

Transitioning to this new domain has proven difficult until now, as there’s a need to understand the effects of scaling up to 3D on both the magnetization and the magnetic field of the systems.

As such, Donnelly and the rest of the team have spent the last few years researching and developing new methods to visualize 3D magnetic structures. They’ve also developed a 3D printing technique for magnetic materials – the one used in the present study

SEM imaging of the 3D printed nanomagnets. Image via University of Cambridge. 1024x670 1
SEM imaging of the 3D printed nanomagnets. Image via University of Cambridge.

 

Scaling magnetization to the third dimension

Once the nanomagnets were 3D printed, the Cambridge team performed their 3D measurements at the PolLux Beamline of the Swiss Light Source at the Paul Scherrer Institute. It is reportedly the only beamline to offer soft X-ray laminography – an advanced X-ray imaging technique.

The researchers found that their 3D printed helical magnets featured a different magnetization texture to what is usually seen in 2D systems. Pairs of walls between magnetic domains were found to be coupled, resulting in deformation. By attracting one another, the walls were seen to rotate and ‘lock into place’, generating strong bonds between the helices of the printed magnets (much like the bonds in a DNA double helix).

Donnelly said, “Not only did we find that the 3D structure leads to interesting topological nanotextures in the magnetisation, where we are relatively used to seeing such textures, but also in the magnetic stray field, which revealed exciting new nanoscale field configurations!”

Having successfully 3D printed magnets with three dimensional magnetization, the scientists will now explore the production of more complex systems with three dimensional magnetic fields. The work shows promise in a variety of domains, including particle trapping, imaging techniques, and smart materials.

Further details of the study can be found in the paper titled ‘Complex free-space magnetic field textures induced by three-dimensional magnetic nanostructures’.

The three dimensional magnetic fields of the 3D printed nanomagnets. Image via University of Cambridge. 1024x758 1
The three dimensional magnetic fields of the 3D printed nanomagnets. Image via University of Cambridge.

The 3D printing of magnetic materials allows for the creation of intelligent systems and a whole host of novel applications. Researchers from Xiamen University have previously 3D printed radio frequency (RF) probe heads capable of performing both routine and unconventional Magnetic Resonance (MR) experiments. MR technology is widely used in scientific research, geological surveys, and clinical diagnosis via MRI scans.

Original Source

3d printing Additive Manfacturing Magnets Nanomagnets smart materials UK
AM Chronicle Editor

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