US3177473A - Magnetic memory device - Google Patents

Magnetic memory device Download PDF

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Publication number
US3177473A
US3177473A US3968A US396860A US3177473A US 3177473 A US3177473 A US 3177473A US 3968 A US3968 A US 3968A US 396860 A US396860 A US 396860A US 3177473 A US3177473 A US 3177473A
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US
United States
Prior art keywords
wire
control conductors
magnetic
magnetisation
memory device
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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 - Lifetime
Application number
US3968A
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English (en)
Inventor
Schoenmakers Wijnand Johannes
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3177473A publication Critical patent/US3177473A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store

Definitions

  • the present invention relates to magnetic memory devices comprising at least one filamentary member of magnetic material having a rectangular hysteresis loop, which member is coupled to several control conductors at discrete distances.
  • a memory device of this type also termed twistor, is for example described in the Bell System Technical Journal, November 1957, pages 1319 to 1340, and may be used in computers or automatic signalling systems for storing binary information in the form of given characteristic states of magnetisation of given parts of the wire in the proximity of the locations where it is coupled to the control conductors.
  • the wire may, for example, be twisted so as to produce internal mechanical stresses and a preferential direction of magnetisation in the material, which magnetisation follows helical lines, the pitch of which subtends an ang e of 45 with the axis of the wire.
  • the magnetisation Since, consequently, the magnetisation has a component at right angles to the wire axis, it is variable by means of a current through the wire itself and, conversely, an induction voltage in longitudinal direction of the wire is produced by magnetisation variations.
  • the wire may be wound at a given pitch onto a core of electrically conductive material.
  • Such memory devices have the advantage over devices with ring-cores that the coupling to the control conductors is simpler in manufacture.
  • control conductors may, for example, be effected by means of windings surrounding the magnetic wire or by causing the control conductors to cross the magnetic wire at right angles and at a short distance, whereas in the case of ring-cores the control conductors have to be slipped through the aperture of the core, which particularly in view of the usually small size of these cores is not simple since the insulation of the control conductors is jeopardized.
  • the storing of information at definite points of the wire in the proximity of the control conductors may, for example, occur by simultaneously applying a pulse to the wire and to particular control conductors, this pulse having such a strength that the current through the wire and through the control conductors is in itself insufficient to change the magnetisation in the wire, since in this case the magnetic field strength remains below the value of the coercive force, whereas at the location where it is coupled to the control conductors to which pulse is applied, the magnetisation changes on account of the coercive force there being surpassed by the joint action of the two pulses.
  • the present invention has for its object to mitigate this disadvantage.
  • short-circuit conductors are provided around the magnetic wire at discrete distances.
  • a number of wires M1, M2 and MS of electrically-conductive magnetic material are provided having a rectangular hysteresis loop.
  • a number of control conductors B1, B2 and B3 are coupled to the several magnetic wires through windings W11, W12, W21 and so on.
  • the magnetic wires are twisted in known manner so as to produce, as stated before, a preferential direction of magnetisation at an angle of approximately 45 with the axes of the wires.
  • Binary signals can be stored independently of each other at several points of one and the same wire in the proximity of the couplings to the several control conductors by imparting to these points a given characteristic state of magnetisation, which may be effected in known manner by simultaneously applying a pulse to the magnetic wire and to the pertinent control conductors. Reading out of the signals formation may, for example, occur by applying a pulse of opposite direction to a magnetic wire, the points where the information is stored being magnetised in opposite direction and a pulse being produced in the coupling windings coupled to said points.
  • a magnetic storage device comprising a filamentary member of electrically conductive magnetic material having a rectangular hysteresis loop, a plurality of spaced apart control conductors coupled to said member, and short-circuited conducting means surrounding said member between each adjacent pair of said control conductors and spaced therefrom.
  • a magnetic storage device comprising a wire of electrically conductive magnetic material having a rectangular hysteresis loop, means for twisting said wire, a plurality of spaced apart control conductors inductively coupled to said wire, and means for limiting propagation of magnetic field along said wire comprising short-circuited conducting means surrounding said wire between each adjacent pair of said control conductors and spaced therefrom.

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  • Magnetic Treatment Devices (AREA)
  • Mram Or Spin Memory Techniques (AREA)
US3968A 1959-02-26 1960-01-21 Magnetic memory device Expired - Lifetime US3177473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL236551 1959-02-26

Publications (1)

Publication Number Publication Date
US3177473A true US3177473A (en) 1965-04-06

Family

ID=19751595

Family Applications (1)

Application Number Title Priority Date Filing Date
US3968A Expired - Lifetime US3177473A (en) 1959-02-26 1960-01-21 Magnetic memory device

Country Status (5)

Country Link
US (1) US3177473A (en(2012))
DE (1) DE1117165B (en(2012))
FR (1) FR1249182A (en(2012))
GB (1) GB938229A (en(2012))
NL (1) NL236551A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275842A (en) * 1962-10-24 1966-09-27 Ibm Magnetic cross-field devices and circuits
US3275997A (en) * 1962-08-21 1966-09-27 Bell Telephone Labor Inc Magnetic information storage unit utilizing conductive ring coupling
US3484761A (en) * 1965-06-09 1969-12-16 Int Standard Electric Corp Pulse transformers comprising stacked ferrite blocks

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR431793A (fr) * 1910-09-20 1911-11-20 Thomson Houston Comp Francaise électro-aimant à fonctionnement retardé
US1778894A (en) * 1927-12-23 1930-10-21 Bell Telephone Labor Inc Relay
AT205776B (de) * 1957-08-01 1959-10-10 Western Electric Co Magnetische Speichereinrichtung
US2945217A (en) * 1958-10-01 1960-07-12 Ncr Co Magnetic data storage devices
US2979701A (en) * 1957-10-17 1961-04-11 Philips Corp Matrix memory system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL254098A (en(2012)) 1959-07-27

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR431793A (fr) * 1910-09-20 1911-11-20 Thomson Houston Comp Francaise électro-aimant à fonctionnement retardé
US1778894A (en) * 1927-12-23 1930-10-21 Bell Telephone Labor Inc Relay
AT205776B (de) * 1957-08-01 1959-10-10 Western Electric Co Magnetische Speichereinrichtung
US2979701A (en) * 1957-10-17 1961-04-11 Philips Corp Matrix memory system
US2945217A (en) * 1958-10-01 1960-07-12 Ncr Co Magnetic data storage devices

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275997A (en) * 1962-08-21 1966-09-27 Bell Telephone Labor Inc Magnetic information storage unit utilizing conductive ring coupling
US3275842A (en) * 1962-10-24 1966-09-27 Ibm Magnetic cross-field devices and circuits
US3484761A (en) * 1965-06-09 1969-12-16 Int Standard Electric Corp Pulse transformers comprising stacked ferrite blocks

Also Published As

Publication number Publication date
FR1249182A (fr) 1960-12-23
GB938229A (en) 1963-10-02
DE1117165B (de) 1961-11-16
NL236551A (en(2012))

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