I am interested in the correlation of domain size of magnetic materials with magnetization, grain size and coercivity.
As the size of the grain decreases the coersivity increases till to a size where the grain size equal to domain size (called critical size),if you decrease the grain size further the domain rotation takes place instead of domain wall motion ,hence coersivity decreases below critical size.The first part of the question,whether it is related to the relation between domain size and magnetization or grain size and magnetization?which one you exactly need,because you asked in first part about domain and in second part about grain size!................
Thank you sir, actually I want to corelate domain size with grain size and magnetic behaviour(M-H characteristics)
Coercivity strongly influences domain size. Generally if the Hc is high the domin size will be small. As for the grain size, it is rare that a grain has a monodomain. for this to happen the grains have to be lesser than 1 micron. Largaer the grain it would have more than one domain. So the most important property that determines the domain size is the coercivity and is related to the anisotropy.
thank you sir, can you provide me some literature related to this. In my case grain size from XRD has found to range from 28 t0 65 nm. I have realized magnetic thin film of ferromagnetic material on p-type and n-type silicon substrate. For p-type structure I have found ~30nm domain size from MFM and superparamagnetic behaviour from M-H characteristics. For n-type structure I have found ~50nm domain size and antiferromagnetic coupled behaviour from our M-H. How can I relate these domain size to grain size and M-H?
I have also found coercivity of ~20 Oe in case of p-type structure and ~45 Oe for n-type structure.
Dear thirmal reddy sir , i need how to calculate circital size
cristallite size can be calculated from XRD-scherrer formula,(by taking care of instrumental broadening etc......) go though the cullity text book on XRD.......
Dear Arvind, check out our paper. Perhaps it would be useful to you.
https://www.researchgate.net/publication/236154307_Magnetic_Microstructure_of_Amorphous_Nanocrystallineand_Nanophase_Ferromagnets
Article Magnetic Microstructure of Amorphous, Nanocrystalline,and Na...
If your sample is bulk than u probably get a wrong crystallite size. More worse if u use Scherrer formula or Williamson-Hall plot but your sample is not isotropic. The methods has a lot limitation to describe the physical behind microstructure.
If u wanna find a relation between crystallite size and domain size (magnetic), u need to grind ur sample close to ur domain size.
Dear Maykel,
Can we calculate the crystallite size from GI-XRD measurement by using Scherrer formula ?
Dear Arvind,
I hope you will get answer from Domain theory (attached the file) and also go through the book "introduction to magnetic materials by b.d.cullity"
It is not simple matter. The domain size would rather depend on the ratio of magnetization to the anisotropy. sure enough coercivity too plays a part. But high anisotropy means higher coercivitiy. As you know the self demagnetizing force depends on the M. If you are talking about polycrystalline materials then it is more complicated as it would depend on the grain size too. To sum up you need a medicine to cure all diseases! does not exist in my opinion.
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