Typical Co-Fe amorphous microwires (diameter 0.1 mm).
The wire was kindly supplied by Dr Firuta Borza, National Institute of Research & Development for Technical Physics Location, Iaşi, Romania.
See also: amorphous_co-fe_microwire_in_glass_magnetica_jpg
You are permitted and indeed encouraged to use this image freely, for any legal purpose including commercial, and with any modifications (the permission is hereby given, so there is no need to ask for it explicitly again), but you MUST always give the following credits:
S. Zurek, Encyclopedia Magnetica, CC-BY-4.0
We would appreciate if you let us know of any use: email@example.com