Logical magnets

Jeri Ellsworth has made a great video in which she explains magnetic hysteresis, and how magnetic properties can be used for magnetic storage and logic.

She fairly describes magnetic logic as a forgotten technology, but I wonder if people are looking at this again since for high end electronics since we now have not only magnetic recording media, but also magnetoresistive random-access memory.


Grain Boundary Allotriomorphic Ferrite and Polygonal Ferrite

Bodnar and Hansen (writing in 1994) note that Polygonal ferrite can occur as grain boundary allotriomophs and intragranular idiomorphs. They then demonstrated the similarity between grain boundary allotriomorph and polygonal ferrite  by showing the same grain boundary area at two different magnifications with different labels. In the combined image you can see that the arrow is pointing at very similar position in two figures.

Grain Boundary Allotriomorph in Figure 1 A





Polygonal Ferrite Figure 1 B

Polygonal Ferrite in Figure 1 B


Posiiton of Figure A in Figure B

Posiiton of Figure A in Figure B