Trends may some times match, but logic may not be.

Because, the magnetic moment depends on the alignment of cations in different sites, where as the Ha depends on the ability of spin rotation in the filed direction.

In other words, magnetic moment is an intrinsic parameter depends on the number and strength of the magnetic cations and their occupation. But, the Ha is an extrinsic parameter depends on anisotropies of the cations as well as the microstructure of the material.

Respected Prof. Rao

thanks for your reply and explaination too

with regards

R B Jotania

According to my experience, Co is a source of high Ha and  Zn is a source of higher magnetic moment. In hexaferrite composites, I think the Ha and the magnetic moment they can be changed by using different amounts of Co and Zn.

Dear Obol

Thanks for sharing your experience

with regards

R B Jotania

Dear Jonita,

First I will appreciate some word on what is Ha.

Now I am not sure that you know the work of Dirac where the notion of spin appear different of that it is often suppose. So I give you some precision in the following.

When Dirac published his equation he has supposed to have find the spin because probably he found half integer values for the angular momentum. But according to the solutions of this equation, it is clear that the “ns” states correspond to just one spin state, contrary to that is generally supposed.

Do we have to consider that the first notion of spin must be reconsidered?

 The two sub-shells of the “np” “nd” and “nf” shell correspond to an additional quantum state to that of the “ns” states, either in the plane of gravitation or perpendicular to it. This is different from the classical notion of spin according to Uhlenbeck G.E. and Goudsmit S., where the spin hypothesis was proposed to explain the two subshells “np” “nd” and “nf”.

Yours Xavier

This is well established from experimental magnetism see: Total angular momentum and atomic magnetic moments; with G. Lochak, J. Magn. Magn Mater. 65, 99-122 (1987).

In fact Dirac ’equation quantify the action in all the directions of the space that is: angular momentum and the perpendicular direction. Now if we consider the classical approach of Bohr Sommerfeld, is it easy to suppose that the initial quantum “h” is share between the plane of gravitation and the perpendicular direction. This is an alternative approach of the quantum state that I suppose to be correct.

 If we consider the classical approach of Bohr Sommerfeld, is it easy to suppose that the initial quantum “h” is share between the plane of gravitation and the perpendicular direction. It is, I suppose, the origin of the magnetic and electric moment found by Dirac in is paper: Proc. Roy. Soc., A117, p610-624, 1928. In experimental magnetism, from the calculation of the magnetic moment according to the solutions of Dirac’s equation, it is clear that the “ns” states correspond to just one spin state, contrary to that is generally supposed.

The two sub-shells of the “np” “nd” and “nf” shell correspond to an additional quantum state to that of the “ns” states, either in the plane of gravitation or perpendicular to it. 

Respected Dr Xavier,

 thanks for explaining concept with references

best regards

R B Jotania