Isotermal Remanent Magnetisation

Wawan Purnama

Abstract


Measurement IRM aims to get the saturation state of the sample being tested. This measurement is done by placing a sample of the finished didemagnetisasi in center of magnetic poles, then given electromagnetic field generated by electric currents Weiss with an acceptable rate of 16 A with voltage of 120 V DC Power Supply and electrical resistance 6,6 Ohm. To obtain a strong magnetic field, of course, required large electrical currents and to keep the heat effect resulting from large currents Weiss electromagnet was then cooled with water that flowed through the cooling pipe with pompa.Kuat electromagnetic field generated by Weiss, in addition to relying the flow is also dependent on the distance of the magnetic poles. The measurement results obtained should show a linear relationship between the magnetic field with an electric current through the relationship M = ai + b where M states in the magnitude of the magnetic field coil elektomagnet Weiss, i declare a strong magnitude of the current in Amperes, while a and b is the number of measurement results obtained ie a = b = 80.26 and 12.03.  IRM measurements performed by means of Minispin Magnetometers with the same procedure as in the measurement of NRM, note the magnitude of the intensity of magnetization is shown as a result of the magnetic field induced by electromagnetic Weiss, then raise the terrain is given by way of adjusting the position switch to position 2 and note the large strong currents caused. After administering field is done, then measure again IRMnya with the same procedure as before to obtain saturation of the sample being tested. Usually the number of steps required for saturation between 11-15 step or maybe less. IRMnya sample to be measured is taken one from each site by considering that the sample is slow decay of its intensity, the characterization of a95 which is quite significant and doesdeclination, inclination and  not vary much with the other characterization.


Full Text:

PDF

References


ASM, Metal handbook, vol 10, Material characterization, The American Society for Metal, Metal Park, Ohio, 1992.

Butler, R. F. (1992) Paleomagnetism : Magnetic Domains to Geologic Terranes, Blackwell.

Cullity, B.D, Introduction to Magnetic Material, Addison-Wesley Publishing Company, 1972

Collinson. David, W, Method in Rock Magnetism and Paleomagnetism Techniques Instrumentation, Chapman-Hall, New York, 1983

Dunlop, D. J and Ozdemir. O, Rock Magnetism Fundamentals and Frontiers. Canbridge University Press, 1997.

Graha, D. Setia., Batuan dan Mineral, 1987.

Katili, J.A, Geology, National Research, Jakarta, 1967

Operation’s Manual Minispin. Molspin Ltd. New Castle, England.

Reilly, W.O, Rock and Mineral Magnetism, Blackie, Chapman-Hall, New York, 1984

Reynold, J. M., (1997) An Introduction to Applied and Envronmental Geophysics.

Sutanto, Soeria Atmadja, R., Maury, R. C. Bellon, H., Proceed. Geologi dan Geoteknologi Pulau Jawa, 73 – 76, 1994.

Soeria Atmadja, R., Maury, R. C., Bellon, H., Pringgoprawiro. H., Polve, M., Tertiary Magnetic Belt in Java, 9, 12, 13-27, 1994.

Sunata, S, Hendro, W., Penerapan Metode Paleomagnetik untuk Rekonstruksi Pergerakan Jangka Panjang Kalimantan, PIT HAGI, 1999.

Tauxe, L., Paleomagnetic Principles and Practice. Kluwer Academic Publishers, 1998.


Refbacks

  • There are currently no refbacks.