This reminds me of magnetic-bubble technology, which was relatively big in the late 1970's and early 1980's. Intel made magnetic bubble devices up to a capacity of 1 megabits/device, which was considered large in comparison with the then-64 kilobit RAMs then in common use.
In contrast, these "skrymions" are said to have a domain size as small as 2 nanometers.
Jim Bell