Loeb, Arthur L. (Arthur Lee)

Scope and Contents MIT DIC 6889. Project Whirlwind Engineering Note E-559. The free energy of magnetization is expressed as a fourth degree polynomial in the magnetization with a linear term due to an external field and quadratic and quartic terms due to Fermi, exchange, magnetostatic, etc., energies as well as to entropy effects. Below the Curie temperature the free energy function has three real extrema, namely two minima and a maximum, if the absolute magnitude of the external field lies below a...

Scope and Contents MIT DIC 6889. Project Whirlwind Memo M-1744. Considering exchange and Fermi energy of a system of electrons together with magnetostatic, magnetostrictive and anisotropy forces, the internal energy of a magnetized system can be expressed as a function of its magnetization. As indicated by Slater, the entropy of the system is also a function of magnetization, so that the free energy can be expressed approximately as an even fourth degree polynomial in the magnetization in the absence of an...

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MIT DIC 6889. Project Whirlwind Memo M-1929. The undersigned continued the discussion on FeNi₃ initiated by Dudley Buck at the seminar on magnetism, the meaning of order-disorder and entropy were examined. Hysteresis loops, saturation magnetization and Curie point of ordered and disordered states were contrasted and their differences tentatively explained.

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MIT DIC 6889. Project Whirlwind Memo M-2412. Neel's molecular field model of ferrimagnetism is reviewed and it is shown how the magnetization below the Curie point can be calculated as a function of temperature using susceptibility data obtained above the Curie temperature. While neither Neel's fundamental concepts nor his conclusions have been altered, his methods have been modified in order to obtain a clearer understanding of his results.

Scope and Contents MIT DIC 6889. Project Whirlwind Memo M-1664. A meeting was held by representative of Group 63, Project Whirlwind, Group 35, Project Lincoln and the Chemistry Department to coordinate research on thin metal films. M. I. T. appears to have all the facilities for the controlled manufacture and an extensive investigation of the properties of thin metal films. Considerable work has already been done here, and all three groups represented are interested in pooling resources for continued and...

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MIT DIC 6889. Project Whirlwind Memo M-1718. Appendix to a memo for a Group 63 seminar on magnetism. Topics include Eddy currents, Maxwell's equation, laminations as electrical insulation.

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MIT DIC 6889. Project Whirlwind Memo M-1697. Appendix to a memo for a Group 63 seminar on magnetism. Topics include spin angular momentum, orbital angular momentum, total angular momentum, and the magnetic field component of angular momentum of an electron.

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MIT DIC 6889. Project Whirlwind Memo M-1752. Appendix to a memo for a Group 63 seminar on magnetism. Topics include the wave motion associated with particle motion, De Broglie's postulate, and Davisson and Germer's confirmation.

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MIT DIC 6889. Project Whirlwind Memo M-1801. Appendix to a memo for a Group 63 seminar on magnetism. Topics include contact potential and a theory of contact potential measurements.

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MIT DIC 6889. Project Whirlwind Memo M-1802. Appendix to a memo for a Group 63 seminar on magnetism. Topics include an analogy between a set of eigenfunctions and coordinate systems, and matrix mechanics.

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MIT DIC 6889. Project Whirlwind Memo M-1971. Appendix to a memo for a Group 63 seminar on magnetism. Topics include the derivation of the law of paramagnetism in ferrites assuming negative interaction between sublattices.

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MIT DIC 6889. Project Whirlwind Memo M-2159. This memo is a summary of an appendix to a Group 63 seminar on magnetism. Topics include calculation of spontaneous magnetization in the region of the curie temperature and the Brillouin function.

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MIT DIC 6889. Project Whirlwind Memo M-1673. This memo is a summary of a Group 63 seminar on magnetism. Topics include a review of magnetic properties, introduction to fundamental theories, discussion of theories, and quantitative applications to simple problems and semi-quantitative extensions to real cases.

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MIT DIC 6889. Project Whirlwind Memo M-1675. This memo is a summary of a Group 63 seminar on magnetism. Topics include Maxwell's Equations, Stokes Theorem, Gauss Theorem, and Wave Equations.

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MIT DIC 6889. Project Whirlwind Memo M-1679. This memo is a summary of a Group 63 seminar on magnetism. Topics include classical Boltzmann statistics, magnetic susceptibility, and diamagnetism.

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MIT DIC 6889. Project Whirlwind Memo M-2260. This memo is an introduction to a Group 63 seminar on magnetism given by Arthur L. Loeb. Information is provided about the three main divisions of the seminar and the memoranda compiled from notes taken by Norman Menyuk.

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MIT DIC 6889. Project Whirlwind Memo M-1687. This memo is a summary of a Group 63 seminar on magnetism. Topics include the linear variation of the susceptibility of paramagnetic materials with the inverse of temperature, Langevin's paramagnetic theory, quantum mechanics, and Bohr's postulates.

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MIT DIC 6889. Project Whirlwind Memo M-1714. This memo is a summary of a Group 63 seminar on magnetism. Topics include domain configuration of ferromagnetic material, domain closure, strains, applications of hysteresis curves, and memory storage for the Whirlwind II Computer.

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MIT DIC 6889. Project Whirlwind Memo M-2116. This memo is a summary of a Group 63 seminar on magnetism. The discussion of an article by Louis Neel, begun at the previous meeting, was continued.

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MIT DIC 6889. Project Whirlwind Memo M-2138. This memo is a summary of a Group 63 seminar on magnetism. Topics include the magnetic characteristics of ferrites in the neighborhood of the Curie temperature.

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MIT DIC 6889. Project Whirlwind Memo M-2207. This memo is a summary of a Group 63 seminar on magnetism. Topics include the variation of the spontaneous magnetization in the region of absolute zero temperature.

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MIT DIC 6889. Project Whirlwind Memo M-2234. This memo is a summary of a Group 63 seminar on magnetism. Topics include the case of negative interaction of ferrite sublattices and antiferromagnetism.

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MIT DIC 6889. Project Whirlwind Memo M-2234. This memo is a summary of a Group 63 seminar on magnetism. Topics include a paper presented at the 1953 Spring meeting of The American Physical Society by C. L. Hogan.

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MIT DIC 6889. Project Whirlwind Memo M-2261. This memo is a summary of a Group 63 seminar on magnetism. Topics include magnetic properties of ferrite materials, the non-linearity of the inverse susceptibility in the paramagnetic region, and the relation of interaction parameters to exchange integrals.

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MIT DIC 6889. Project Whirlwind Memo M-1688. This memo is a summary of a Group 63 seminar on magnetism. Topics include Langevin's theory of paramagnetism and some general paramagnetic properties.

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MIT DIC 6889. Project Whirlwind Memo M-1689. This memo is a summary of a Group 63 seminar on magnetism. Topics include Langevin's theory of paramagnetism, the Curie-Weiss Law, and exchange interactions.

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MIT DIC 6889. Project Whirlwind Memo M-1700. This memo is a summary of a Group 63 seminar on magnetism. Topics include Weiss' notion of the internal field, magnetic domains, domain theory, domain growth, and domain rotation.

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MIT DIC 6889. Project Whirlwind Memo M-1708. This memo is a summary of a Group 63 seminar on magnetism. Topics include heat effects, domain energies, and preferred directions of magnetization.

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MIT DIC 6889. Project Whirlwind Memo M-1724. This memo is a summary of a Group 63 seminar on magnetism. Topics include the harmonic oscillator, the case of boundary wall energy as a function of displacement, the motion of a body under friction, the resonance frequency of a system.

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MIT DIC 6889. Project Whirlwind Memo M-1720. This memo is a summary of a Group 63 seminar on magnetism. Topics include how the damped linear harmonic oscillator may be used to explain the properties of a dielectric when subjected to electromagnetic radiation.