Dear Amr,

The method that we commonly use, employs the (i) Curie Temperature; or (ii) the unblocking field.

--For the (i), the thermo-magnetic curves (variation of magnetic susceptibility with temperature) are measured between room temperature and 650°C. The reversibility of the curves is checked, and a second round of the measurements is done, if some metastable phases are present.

--Then, the Curie temperature is determined using the first derivative technique and/or tangent method (e.g., Petrovský and Kapička 2006)

-- The Curie temperature may be compared with the results from Lattard et al., 2006

For (ii) You need hysteresis measurements followed by UnMix processing (Egli, 2005).

--This will allow you to estimate the unblocking field and coercivity.

--The results may be compared with the data in Lowrie 1990, and the references there in.

Usually the results should be comparable.

I hope this helps

Amar

ref:

Petrovský, E.D., Kapička, A., 2006. On determination of the Curie point from thermomagnetic curves. J. Geophys. Res. Solid Earth 111:1–10. http://dx.doi.org/10.1029/ 2006JB004507.

Lattard, D., Engelmann, R., Kontny, A., Sauerzapf, U., 2006. Curie temperatures of synthetic titanomagnetites in the Fe-Ti-O system: effects of composition, crystal chemistry, and thermomagnetic methods. J. Geophys. Res. 111 B12S28. 10.1029/2006JB004591.

Egli, R., 2005. User's Guide to theMAG-MIX,Magnetic Unmixing Software Packet, Release 1, April 2005. Free Distrib. http://dourbes.meteo.be/aarch.net/magmix.man.pdf.

Lowrie, William. "Identification of ferromagnetic minerals in a rock by coercivity and unblocking temperature properties." Geophysical research letters 17.2 (1990): 159-162.

Dear Amar Agarwal

thank you for your help

Amar Agarwal