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The released particles on the magnetic surface will orient along the magnetic fields of the domains. Applying external magnetic field via 3D Helmholtz coils we can move the magnetic particles along the surface. Oscillating the magnetic field at valuable speed will lead to the orientation of the particles along the magnetic fields, as we can see (track particle on top left).
When the oscillating time is too short we can see the particle moving along the external magnetic field, but without orienting along the magnetic domains on the surface. We can see this particle also in the next video, entering the frame from right.
Depending on the fabrication, some of the particles can't be used for the transportation, caused by the residual layer (RL) as we can see it on the top. These particles were connected through the RL and just swing with the oscillation. Unfortunately the RL is not visible here.
Depending on the external magnetic field and oscillating speed, the particle is not just gliding flat on the surface, it also moves straight upright.
Some fields were not strong enough to move the particles forward, it took some time.
When the cavities of the stamp were not completely filled, we get some artifacts, which we can see in the surrounding of the transported particles.
Preliminary results of magnetic particles (see publication Ha et al. (2018).
Results of the KERR microscope
We measured with the KERR microscope the magnetization of our released bi-layer particles. We can clearly see the change at the edge of our particles. The color will change, when the magnetic moment of the implemented magnetic particles were aligned with the applied magnetic field. Depending on the orientation of the magnetization, we will see white (parallel orientation) / grey (not aligned) / black (anti parallel oriented) color. We can see on the top right corner our particles, whereby the change is just at the edges, which indicates, that we have an anisotropic distribution of the implemented magnetic particles.
Preliminary results of functional particles fabricated via lithography methods
