Magnetic Properties in Finemet-Type Soft Magnetic Toroidal Cores Annealed under Radial Stresses

Round 1

Reviewer 1 Report

The paper is well organized and presented. The references might be improved with some more recent paper in this field.

the English is very clear, the methods and materials are well presented,
the paper is well-organized and the I have no comments for the authors.
These are the reasons that my review is so short. I am very familiar with
the subject and the paper impressed me.

Author Response

Thank you for reviewing my paper.

Reviewer 2 Report

The Authors have studied and presented a novel approach to induce magnetic anisotropy by applying radial stresses on tape wound cores of Fe73.5Si13.5B9Cu3Nb1 (at. %) ribbon during crystallization heat treatment. The results showed that while stress annealing does not change the structural characteristics of annealed samples, the magnetic anisotropies induced can increase to values ~3–5 times larger than the sample annealed in the absence of external stress. This increase in magnetic anisotropy energy is associated with ~25–50% decrease of magnetic inductance in the treated cores.

Generally, Authors present nice work and analyze and describe observed changes quite well.

The paper is well organized and written.

I suggest for the Authors to read the paper carefully.

However in line:

- Authors mentioned about “h” parameter which should be show in Fig 1c but it is not? They could also write what is “h”.

Questions: in line 188-192 is information about magnetic anisotropy increases which Authors explain with stress increasing. However, potential Readers looking on Fig. 2b, where practical constant value of microstrain as a function of the extent of stress annealing is visible, can be confused? Could Author comment this?

Author Response

Authors mentioned about “h” parameter which should be show in Fig 1c but it is not? They could also write what is “h”

Reply: I have marked “h” in the original figure.

In line 188-192 is information about magnetic anisotropy increases which Authors explain with stress increasing. However, potential Readers looking on Fig. 2b, where practical constant value of microstrain as a function of the extent of stress annealing is visible, can be confused? Could Author comment this?

Reply: The XRD data in Fig.2 have been analyzed using Williamson-Hall method as a modified Scherrer formula taking the internal stress into consideration. The results obtained are the size and lattice distortion of the Fe₃Si phase. It does not reflect the morphology and stress of the entire grain.These results suggest that radial stresses imposed on wound cores are not large enough to significantly alter the structural characteristics of Fe₃Si phase during nanoscrysatllization. I think the structural evolution of nanocrystalline soft magnetic alloys during annealing treatment depends mainly on annealing temperature and time. All samples are annealed at 813 K for 1 h, so the structural characteristics of Fe₃Si phase do not change so much.

 In Fig.5, we are discussing the effect of applied stress on magnetic anisotropy. The applied stress changes the magnetic anisotropy energy of the stress annealed nanocrystalline magnetic cores. Stress leads to magnetoelastic anisotropy, which in turn induces anisotropy.

The two cannot be confused.