Browsing Project Whirlwind Reports by Creator "Goodenough, John B."
Now showing items 1-16 of 16
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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. ...