GB1299667A - Memory cores having rectangular hysteresis loop characteristics and method of manufacturing the same - Google Patents

Memory cores having rectangular hysteresis loop characteristics and method of manufacturing the same

Info

Publication number
GB1299667A
GB1299667A GB2064570A GB2064570A GB1299667A GB 1299667 A GB1299667 A GB 1299667A GB 2064570 A GB2064570 A GB 2064570A GB 2064570 A GB2064570 A GB 2064570A GB 1299667 A GB1299667 A GB 1299667A
Authority
GB
United Kingdom
Prior art keywords
rectangular hysteresis
hysteresis loop
manufacturing
toroids
sintering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2064570A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP44034077A external-priority patent/JPS4831437B1/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1299667A publication Critical patent/GB1299667A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2616—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing lithium
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
    • G11C11/06—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element
    • G11C11/06007—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element using a single aperture or single magnetic closed circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

1299667 Ferrite cores HITACHI Ltd 29 April 1970 [6 May 1969 (2)] 20645/70 Heading H1H A magnetic memory core having a rectangular hysteresis characteristic is made of a composition including Li, Fe<SP>3+</SP>Zn<SP>2+</SP>, O together with Mn<SP>3+</SP> and/or Mn<SP>2+</SP> and represented by the formula where 0À03 # x + y # 0À75; 0À09 # z # 0À42. <SP>4</SP> The composition may also contain V 2 O 5 and/or SiO 2 in amounts not greater than 2À0 wt. per cent and 3À0 wt. per cent respectively. The core is made by pre-firing a mixture of oxideforming metal compounds, e.g. oxalates or carbonates, grinding, pressing into shape and sintering. Sintering may be effected at 1000-1200‹ C. for, e.g. 2-20 minutes in an oxygen atmosphere when Mn<SP>2+</SP> is absent, in conditions of reducing O 2 partial pressure with increase in Mn<SP>2+</SP>/Mn<SP>3+</SP> ratio, and in a reducing atmosphere when Mn<SP>3+</SP> is absent. In examples, wet or dry mixtures of oxide precursors are fired at 700- 900‹ C. for 2 hrs., ground, mixed into granules with P.V.A., press-moulded into toroids and sintered on O 2 , air or N 2 . The toroids have a rectangular hysteresis loop.
GB2064570A 1969-05-06 1970-04-29 Memory cores having rectangular hysteresis loop characteristics and method of manufacturing the same Expired GB1299667A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3407869 1969-05-06
JP44034077A JPS4831437B1 (en) 1969-05-06 1969-05-06

Publications (1)

Publication Number Publication Date
GB1299667A true GB1299667A (en) 1972-12-13

Family

ID=26372877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2064570A Expired GB1299667A (en) 1969-05-06 1970-04-29 Memory cores having rectangular hysteresis loop characteristics and method of manufacturing the same

Country Status (3)

Country Link
DE (1) DE2022027B2 (en)
FR (1) FR2042425B1 (en)
GB (1) GB1299667A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2021088B (en) * 1978-05-18 1982-07-07 Ampex Sintering agents for ferrites
DE3475295D1 (en) * 1983-09-12 1988-12-29 Philips Nv Magnet core of lithium-zinc-manganese ferrite
NL8402601A (en) * 1984-08-27 1986-03-17 Philips Nv MAGNETIC CORE BASED ON LITHIUM-ZINC-MANGANIC FERRITE.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB989389A (en) * 1962-01-12 1965-04-14 Rca Corp Ferromagnetic ferrite core and method of manufacture thereof

Also Published As

Publication number Publication date
DE2022027B2 (en) 1972-09-14
FR2042425A1 (en) 1971-02-12
DE2022027A1 (en) 1970-11-26
FR2042425B1 (en) 1974-03-01

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee