3. 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. 20 25 30. (2) The magnetization can be defined as E M B ∂ =− ∂, (3) where E is the total energy of the system. 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. 200. Definitions (2) and (3) are more general and can be used in calculations. Measure- 35. as: M = .H. Curie law of the magnetic susceptibility 0 100. Magnetic Susceptibility. 40 45 50. 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) 0 5 10. The force is measured with the magnetic field turned ON and with the field OFF at a given temperature (e.g., room temperature). Magnetic susceptibility is defined as the degree of magnetization of material when placed in a magnetic field. In other words, it is the magnetic field which material itself produces. 300 400 500. magnetic field gradient, which is not very practical! 1a. Fortunately only a few minerals occur abundantly enough in nature to make a significant contribution to the induced and remanent fields. 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. 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. mol −1 (CGS) and is defined as \[{\displaystyle \chi _{\text{mol}}=M\chi _{v}/\rho }\] Magnetic materials 1. the magnetic susceptibility, spatial distribution and concentration of the local crustal materials. define the magnetic susceptibility as follows M B χ ∂ = ∂. 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. 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