Magnetization textures
Magnetic domain walls in a sample of iron meteorite showing how the nanoscale precipitates create offsets on the domain walls. To the right of the image, you can see an image from Atom Probe Tomography, showing the nano-precipitates with different iron content. Click on the image to go to the full article in ACS Nano Letters.
Lattice of solitons, a special type of magnetic domain wall, in a chiral material. Click on the image to go to the full article in ACS Nano Letters.
Lattice of Skyrmions, a topologically non-trivial magnetization texture, and the process via which is breaks via the creation of antiskyrmions. Click on the image to go to the full article in Nature Scientific Reports.
Magnetization texture around a Bloch point, a topological defect where the magnetization vanishes at its center. Click on the image to go to the full article in Physical Review B.
Magnetization reversal process in a greigite thin film with grains that have a size of 20 nanometers. Click on the image to go to the full article in Nature Scientific Reports.
Models
Stereoscopic projection of the magnetic anisotropy in magnetite nanoparticles. Click on the image to go to the full article in Journal of Applied Physics.
Illustration of a theoretical model for an antiferromagnet, where each layer is ferromagnetic and the interaction between them is antiferromagnetic. Click on the image to go to the full article in Physical Review B.
Models of local atomic arrangements in thin films of Co-Pt, which can be a random alloy (a), a rough multilayer (b) or a Pt matrix with Co platelets (c), otherwise termed as short-range order. Click on the image to go to the full article in Physical Review B.
Monte Carlo simulation of a hysteresis loop of a frustrated system, i.e., a material with competing interactions, which at low temperature exhibits unexpected magnetization steps. Click on the image to go to the full article in Physical Review Letters.
Monte Carlo simulation of a hysteresis loop of an artificial ferromagnet, i.e., a stack of ferromagnetic layers that are coupled antiferromagnetically. The sequence of layer reversal is such that minor loops emerge, depending on the number of layers. Click on the image to go to the full article in Applied Physics Letters.
Illustration of the four possible configurations of a Bloch point, a topological defect where the magnetization vanishes at its center. Click on the image to go to the full article in Physical Review B.
Structural defects in the form of steps in a layered antiferromagnet can lead to the appearance of non-zero magnetization due to incomplete compensation of the magnetization.. Click on the image to go to the full article in Journal of Applied Physics.
Model for a layered system, where the coupling between the ferromagnetic layers can be either positive or negative, resulting in multiple possible configurations. Click on the image to go to the full article in Physical Review B.
Crystal structure of Ilmenite, an oxide consisting of iron and titanium, where each metal ion is coordinated by oxygen ions and the iron and titanium are stacked on alternating layers. Click on the image to go to the full article in Physical Review B.
A moving Bloch point generates an electric field around it, due to the changing magnetization texture. The electric field looks like as if it was created by a moving magnetic monopole, hence Bloch points are also called emergent monopoles. Click on the image to go to the full article in Physical Review Letters (left) or APL Materials (right).
Structures and microstructures
A collection of iron-oxide nanoparticles as viewed in a Transmission Electron Microscope. When zoomed in, you can see the individual particles and distinguish their size and shape, and going even deeper allows you to see individual rows of atoms (c). Click on the image to go to the full article in Journal of Applied Physics.
Lorentz Transmission Electron Microscopy images, off-axis electron holography images, and simulated images showing how the magnetic domain walls in a Sm-Co magnet follow the pattern of the microstructure. Click on the image to go to the full article in Nature Scientific Reports.
Scanning Electron Miscoscopy image of a sample containing a heat-treated iron-titanium-oxide solid solution. Titanium rich precipitates come out of the titano-magnetite solution and follow the directions of the crystal lattice. Click on the image to go to the full article in Geophysical Journal International.
Magnetotactic bacteria biomineralize iron from their environment and make iron-oxide (or sometimes sulfate) nanoparticles in the form of a linear chain. This chain gives them a magnetic dipole moment that helps them navigate using the Earth's magnetic field, just like a compass. Click on the image to go to the full article in Applied Physics Letters.