The sensitivity of magnetic Barkhausen noise (MBN) profile to changes in the excitation field strength and the number of turns of the detection coil was investigated in inhomogeneous material. Generally, the 0.5 mm case depth EN 36 steel specimen shows a double peak profile indicative of inhomogeneity through the detected depth the magnetized landscape. Various excitation field amplitudes were applied to the specimen and the induced MBN emission was analyzed for each magnetizing current. Excitation field at the lowest level induced an MBN emission of two peaks of equivalent heights. The first peak occurs at lower field than the second peak in the magnetization period. As the excitation field increased, the height of both peaks increased but the second peak increased in a higher rate than that of the first peak. Beyond certain excitation level, both peaks began to saturate and no increase in the MBN intensity was observed with increased excitation field strength. However, peak position and the number of Barkhausen events, indicated linearly as a function of the applied field strength. The experiment also establishes that the number of turns in the detection coil is important parameter which controls the height of the first peak. Low field peak height increases as the number of turn of the detection coil increases. The results indicate that the potential difference applied to the electromagnet and the sensitivity of the detection coil, determine the MBN profile characteristics.
 Ranjan, R., Jiles, D.C. and Rastogi, P. (1987) Magnetic Properties of Decarburized Steels: An Investigation of the Effects of Grain Size and Carbon Content. IEEE Transactions on Magnetics, MAG-23, 1869-1876. http://dx.doi.org/10.1109/TMAG.1987.1065175
 Jiles, D.C. (2000) Dynamics of Domain Magnetization and the Barkhausen Effect. Czechoslovak Journal of Physics, 50, 893-924. http://dx.doi.org/10.1023/A:1022846128461
 Blaow, M., Evans, J.T. and Shaw, B.A. (2005) Magnetic Barkhausen Noise: The Influence of Microstructure and Deformation in Bending. Acta Materialia, 53, 279-287. http://dx.doi.org/10.1016/j.actamat.2004.09.021
 Blaow, M., Evans, J.T. and Shaw, B.A. (2005) Surface Decarburization of Steel Detected by Magnetic Barkhausen emission. Journal of Materials Science, 40, 5517-5520. http://dx.doi.org/10.1007/s10853-005-4240-5
 Moorthy, V., Vaidyanathan S., Jayakumar, T., and Raj, B. (1997) Microstructural Characterization of Quenched and Tempered 0.2 % Carbon Steel Using Magnetic Barkhausen Noiseanalysis. Journal of Magnetism and Magnetic Materials, 171, 179-189. http://dx.doi.org/10.1016/S0304-8853(97)00049-8
 Saquet, O., Chicois, J. and Vincent, A. (1999) Barkhausen Noise from Plain Carbon Steel: Analysis of the Influence of Microstructure. Materials Science and Engineering: A, 269(A), 73-82.
 Sablik, J., Augustyniak, B. and Chmielewski, M. (1999) Modelling Biaxial Stress Effects on Magnetic Hysteresis in Steel with the Field and Stress Axes Noncoaxial. Journal of Applied Physics, 85, 4391-4393. http://dx.doi.org/10.1063/1.369794
 Kim, H.C., Hwang, D.G. and Kim, C.G. (1992) Evaluation of Residual Stress and Texture in Ferromagnetic Crystalline Material by Barkhausen Noise Measurements. Journal of Nondestructive Evaluation, 8-9, 575-590.
 Vaidyanathan, S., Moorthy, V., Jayakumar, T. and Raj, B. (2000) Evaluation of Induction Hardened Case Depth through Microstructural Characterization Using Magnetic Barkhausen Emission Techniques. Materials Science & Technology, 16, 202 208. http://dx.doi.org/10.1179/026708300101507550
 Bach, G., Goebbels,K. and Theiner, W.A. (1988) Characterization Ofhardening Depth by Barkhausen Noise Measurement. Mat.Eval., 46, 1576-1580.
 Dubois, M. and Fiset, M. (1995) Evaluation of Case Depth on Steels by Barkhausen Noise Measurement. Materials Science & Technology, 11, 264-267. http://dx.doi.org/10.1179/mst.19126.96.36.1994
 Vaidyanathan, S., Moorthy, V., Jayakumar, T. and Raj, B. (1998) Evaluation of Carburization Depth in Service Exposed Ferritic Steel Using Magnetic Barkhausen Noise Analysis. Mat. Eval., 56, 449-452.
 Alessandra, J., Gunther, L. and Gerhardt, F. (2013) Case Depth in SAE Steel Using Barkhausen Noise. Matres and Matrones, 16, 1015-1019. http://dx.doi.org/10.1590/S1516-14392013005000095
 Hao, X., Yin, W., Strangwoof, M., Peyton, A., Morris, P. and Davis, C. (2008) Off line Measurement of Decarburization of Steels Using a Multifrequency. Electromagnetic Sensor, 58, 1033-1036.
 Dhar, A. and Atherton, D.L. (1992) Influence of Magnetizing Parameters on the Magnetic Barkhausen Noise. IEEE Transactions on Magnetics, 28, 3363-3366. http://dx.doi.org/10.1109/20.179811
 Hwang, D. and Kim, H. (1988) The Influence of Plastic Deformation on Barkhausen Effects and Magnetic Properties in Mild Steel. Journal of Physics D: Applied Physics, 21, 1807-1813. http://dx.doi.org/10.1088/0022-3727/21/12/024
 Jiles, D.C. (1988) The Influence of Size and Morphology of Eutectoid Carbides on the Magnetic Properties of Carbon Steels. Journal of Applied Physics, 63, 2980-2983. http://dx.doi.org/10.1063/1.340921
 Lo, C.C.H., Kinser, E.R. and Jiles, D.C. (2006) Analysis of Barkhausen Effect Signals in Surface Modified Magnetic Materials Using a Hysteretic Stochastic Model. Journal of Applied Physics, Article ID: 08B705.