The magnetic susceptibility factor χ arises from the magnetization M induced in a material exposed to an external magnetic field H 0, corresponding to a magnetic induction B 0 =μ 0 H 0, in the absence of the material, where μ 0 =4π×10 −7 (T m A −1) is the magnetic permeability in vacuum. define the magnetic susceptibility as follows M B χ ∂ = ∂. 200. In other words, it is the magnetic field which material itself produces. Fortunately only a few minerals occur abundantly enough in nature to make a significant contribution to the induced and remanent fields. 4/30/2015 J.Subrahmanyam Confidential 1 2. 11 The out-of-phase component of the susceptibility is nonzero for temperatures slightly below the transition temperature, where magnetic irreversibility occurs in the sample. Magnetization (M) and Magnetic field (H) are related by a term known as Magnetic Susceptibility (.) 15. magnetic field gradient, which is not very practical! 3. w.wang 46 Magnetic susceptibility and permeability In large class of materials, there exists a linear relation between M (internal magnetization) and H (external applied magnetic field)M = χH χ is positive then the material is called paramagnetic χis negative then the material is diamagnetic A linear relationship also occurs between B (magnetic flux density) Where Φ is the magnetic flux and A is the area of cross section. (2) The magnetization can be defined as E M B ∂ =− ∂, (3) where E is the total energy of the system. 600. 0 5 10. Definitions (2) and (3) are more general and can be used in calculations. Magnetic materials 1) Magnetic Induction or Magnetic Flux density (B): The magnetic induction or magnetic flux density is the number of lines of magnetic force passing through unit area perpendicularly. The force is measured with the magnetic field turned ON and with the field OFF at a given temperature (e.g., room temperature). 20 25 30. Magnetic susceptibility is defined as the degree of magnetization of material when placed in a magnetic field. mol −1 (CGS) and is defined as $\chi _{\text{mol}}=M\chi _{v}/\rho$ THEORY: For diamagnetic materials, let us imagine that an atom that is a nucleus in a stationary cloud of electrons is placed in a magnetic field, as in Fig. Magnetic Field: The magnetic field is an imaginary line of force around a magnet which enables other ferromagnetic materials to get repelled or attracted towar… O SlideShare utiliza cookies para otimizar a funcionalidade e o desempenho do site, assim como para apresentar publicidade mais relevante aos nossos usuários. magnetic susceptibility of a number of materials by using a sample, a magnetic field, and a mass balance, and compare the values to the known material susceptibilities. 40 45 50. 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