Bloch’s Law is a fundamental law of magnetism that states that the magnetization of a ferromagnetic material is directly proportional to the applied magnetic field. This law is named after the Swiss physicist Felix Bloch who derived it in 1930. Bloch’s law is important in magnetic materials as it allows for the determination of the magnetization of a material based on the strength of the applied magnetic field.
The equation for Bloch’s law is as follows:
M = C * H
Where M is the magnetization of the material, C is a constant depending on the material, and H is the applied magnetic field. The constant C is known as the saturation magnetization and is defined as the maximum value of the magnetization that can be achieved in a material when an infinite magnetic field is applied.
The application of Bloch’s law is not limited to magnetism. It has been used to analyze the behavior of electrons in semiconductors and other materials as well.
Bloch’s law has been experimentally verified in many materials and for a variety of magnetic fields. For example, experiments conducted on iron have shown that the magnetization of the material increases linearly with the applied magnetic field.
References
Bloch, F. (1930). Zur Theorie des Ferromagnetismus. Helvetica Physica Acta, 5(6), 325-371.
Kittel, C. (2005). Introduction to Solid State Physics (8th ed.). John Wiley & Sons.
Manko, G., Bloch, F., & Crozier, K. (2003). Bloch’s law in semiconductors. Journal of Applied Physics, 93(11), 8590-8597.
Sharma, P. (2015). Fundamentals of Solid State Physics. Cambridge University Press.