Question:
I would like to know more about anisotropy of METGLAS 2605SA1, does it occur at all, and if it does, how does it effect core losses?
Answer:

As-cast METGLAS2605SA1 ribbon has a magnetic anisotropy along the ribbon length direction (induced by casting), which can be changed by heat-treatment. For example, by applying a magnetic field along the ribbon length direction, you can increase the degree of the cast-in anisotropy. The effect of the anisotropy on core loss depends on the size and direction of the magnetic anisotropy. This is a general property of a magnetic material and I recommend that you read, for example, a book "Physics of Magnetism" by S. Chikazumi (John Wiley & Sons, New York; 1964).