Browsing Project Whirlwind by Creator "Goodenough, John B."

Now showing items 1-16 of 16

    • Ad Hoc Conference on FeNi₃ 

      Buck, Dudley A.; Goodenough, John B.; Loeb, Arthur L.; Menyuk, Norman (MIT Digital Computer Laboratory, 1953-03-25)
      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 ...

    • B-H Loop Squareness in the Magnesium-Manganese Ferrites 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1953-10-22)
      A mechanism is proposed whereby a tetragonal 2MOMnO₂ phase is precipitated at {101} surfaces in manganese-rich spinel systems. The critical Mn[superscript +4] content for precipitation is estimated from studies of lattice ...

    • Conference on Ferrimagnetism, 11-12 October, 1954 

      Goodenough, John B.; Baltzer, P. K.; Menyuk, N.; Vinal, F. E. (Lincoln Laboratory - Division 6, 1954-12-08)
      The eighteen papers which were presented at the conference on ferrimagnetism at the U. S. Naval Ordnance Laboratory, 11-12 October 1954, are summarized. Pertinent discussions are also included.

    • Graphical Summary of Core Data in the MgO-Fe₂O₃-MnO System 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1954-01-25)
      A graphical summary of some of the magnetic data which were collected during 1953 on the MgO-Fe₂O₃-MnO System is presented.

    • Group 63 Seminar on Magnetism, LIV 

      Loeb, Arthur L.; Goodenough, John B.; Menyuk, Norman; Baltzer, P. K. (MIT Digital Computer Laboratory, 1953-06-11)
      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.

    • Group 63 Seminar on Magnetism, XLII 

      Loeb, Arthur L.; Baltzer, Philip K.; Goodenough, John B.; Menyuk, Norman (MIT Digital Computer Laboratory, 1953-03-23)
      This memo is a summary of a Group 63 seminar on magnetism. Topics include evaluation of the density of energy states at the top of the Fermi distribution, and binding energies in body-centered transition metals.

    • Group 63 Seminar on Magnetism, XLIII 

      Loeb, Arthur L.; Goodenough, John B.; Menyuk, Norman (MIT Digital Computer Laboratory, 1953-03-25)
      This memo is a summary of a Group 63 seminar on magnetism. Topics include Heusler alloys, the Heisenberg model, the Zener model, the Heisenberg theory of ferromagnetism, and the collective electron theory based on the ...

    • Group 63 Seminar on Magnetism, XLVI, March 26, 1953 

      Loeb, Arthur L.; Goodenough, John B. (MIT Digital Computer Laboratory, 1953-04-02)
      This memo is a summary of a Group 63 seminar on magnetism. Topics include ferrimagnetic properties of ferrites and the mechanism of spin reversal in domain wall motion. Professor N. Bloembergen of the Department of Physics, ...

    • Group 63 Seminar on Magnetism, XXXVIII 

      Loeb, Arthur L.; Goodenough, John B.; Menyuk, Norman (MIT Digital Computer Laboratory, 1953-03-16)
      This memo is a summary of a Group 63 seminar on magnetism. Topics include the phenomenon of superexchange, Hund's rule, the exchange effect, ferrites, and ferrimagnetism.

    • The influence of chemistry on B-H loop shape, coercivity, and flux-reversal time in ferrites 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1956-05-16)
      The factors which influence the shape of the B-H loop, the coercivity, the permeability, and the flux reversal time in ferrimagnetic spinels are considered on two levels: a macroscopic and an atomic level. To minimize ...

    • Nucleation of Domains of Reverse Magnetization and Switching Characteristics of Magnetic Materials 

      Goodenough, John B.; Menyuk, Norman (MIT Digital Computer Laboratory, 1953-03-09)
      The critical requirements for a ferromagnetic memory core are reviewed. Domains of reverse magnetization must form and grow within a core if its induction is to be reversed. The nature of the nucleation centers for these ...

    • Remarks on domain patterns recently found in BiMn and SiFe alloys 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1955-12-27)
      Memorandum discussing domain patterns in BiMn and SiFe alloys.

    • A Theory of Deviation from Close Packing in Hexagonal Metal Crystals 

      Goodenough, John B. (MIT Digital Computer Laboratory, 1952-09-11)
      A mechanism is proposed to show how the Fermi surface interacts with the Brillouin zone boundaries. The direction and relative magnitude of the variation of the c/a ratio for hexagonal crystals from the ideal value for ...

    • A Theory of Perovskite-Type Manganites (La,M(II))MnO₃ 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1954-11-30)
      Semicovalence and its effects on indirect magnetic-exchange interaction are reviewed and applied to the manganites. These considerations lead to qualitative predictions which are in complete accord with the following ...

    • Thoughts on Incremental Permeability 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1954-09-17)
      After a short discussion of the factors which influence the incremental permeability, three different methods are discussed which should give a large change in incremental permeability with a change of the biasing field. ...

    • Trip Report to Bell Telephone Laboratories, Murray Hill, N.J., January 6, 1954 

      Goodenough, John B. (Lincoln Laboratory - Division 6, 1954-01-14)
      The ferrite single-crystal-synthesis program of the Bell Telephone Laboratories was investigated. Information on some experimental techniques for measurement about to be undertaken in this laboratory was also obtained. ...