How to calculate a negative anisotropy field (Hk) from the out-of-plane hysteresis loop (for volume contribution anisotropy- that is, a final result of Keff is in negative). The formula we know that,
Based on the magnetic layer thickness,
Keff = Kv + Ks/t
and also we know that Keff = (Hk x Ms/2)
My question is, how can we get Keff is negative value by using the formula of Hk = Hs + 4 pie Ms (the negative Keff value represents the main contribution from volume anisotropy and obviously is not from the surface anisotropic effect). How to find (saturation field (Hs) to make it as negative and how to calculate from the hysteresis loop as negative value) ?
There is a direct formula to determine magnetocrystalline anisotropy in materials with perpendicular anisotorpy based on out of plane and in-plane hysteresis loops given for instance in paper: C. Zeng et al. Appl. Phys. Lett 83, 5002 (2003). The sign of K is a matter of convention I guess. Hope it will somewhat help you.
Thank you. But i need to know more information about that. However, thanks for your comments
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