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Temperature-stable low-noise ferrite memory cores

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2 Author(s)
Kuroda, C. ; Nippon Telegraph and Telephone Public Corporation, Ibaraki, Japan ; Kawashima, T.

Temperature-stable low-noise memory cores made from the substituted lithium and nickel ferrites were studied. Ferrite compositions which are suitable for miniature cores have been developed by studying magnetic properties of the ferrite in the system Li-M-M' and Ni-M-M' ferrite (M:Mn, Fe, Co, Ni, Cu, and Zn). Technological approaches for fabricating small memory cores were made by studying the effect of ferrite-powder parameters and sintering conditions on magnetic properties of the substituted ferrites. Typical pulse characteristics taken with coincident current mode for cores of 0.48, 0.32, and 0.27 mm φ OD are presented. It was found that the Ni-Mn-F(II) ferrites are suitable for a low-drive high signal-to-noise ratio (dV1/dVz) temperature-stable memory core.

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Magnetics, IEEE Transactions on  (Volume:5 ,  Issue: 3 )