BE767308A - Particules de fer magnétiques aciculaires stables - Google Patents

Particules de fer magnétiques aciculaires stables

Info

Publication number
BE767308A
BE767308A BE767308A BE767308A BE767308A BE 767308 A BE767308 A BE 767308A BE 767308 A BE767308 A BE 767308A BE 767308 A BE767308 A BE 767308A BE 767308 A BE767308 A BE 767308A
Authority
BE
Belgium
Prior art keywords
magnetic iron
iron particles
stable needle
needle
stable
Prior art date
Application number
BE767308A
Other languages
English (en)
Inventor
F T Aldridge
Original Assignee
Ampex
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
Application filed by Ampex filed Critical Ampex
Publication of BE767308A publication Critical patent/BE767308A/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
    • G11B5/65—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition
    • G11B5/658—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition containing oxygen, e.g. molecular oxygen or magnetic oxide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/065—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder obtained by a reduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Hard Magnetic Materials (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Compounds Of Iron (AREA)
BE767308A 1970-05-22 1971-05-18 Particules de fer magnétiques aciculaires stables BE767308A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3988270A 1970-05-22 1970-05-22

Publications (1)

Publication Number Publication Date
BE767308A true BE767308A (fr) 1971-10-18

Family

ID=21907838

Family Applications (1)

Application Number Title Priority Date Filing Date
BE767308A BE767308A (fr) 1970-05-22 1971-05-18 Particules de fer magnétiques aciculaires stables

Country Status (6)

Country Link
US (1) US3623859A (fr)
JP (1) JPS515608B1 (fr)
BE (1) BE767308A (fr)
FR (1) FR2090199B1 (fr)
GB (1) GB1291406A (fr)
NL (1) NL141686B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212933A1 (de) * 1972-03-17 1973-09-20 Philips Nv Verfahren zur herstellung eines im wesentlichen aus eisen bestehenden metallpulvers
JPS54122664A (en) * 1978-03-16 1979-09-22 Kanto Denka Kogyo Kk Production of magnetic powder for magnetic recording based on iron
US4256484A (en) * 1979-07-30 1981-03-17 Pfizer Inc. Metallic iron particles for magnetic recording
US4305752A (en) * 1979-07-30 1981-12-15 Pfizer Inc. Metallic iron particles for magnetic recording
DE3116489A1 (de) * 1981-04-25 1982-11-11 Basf Ag, 6700 Ludwigshafen Verfahren zur stabilisierung pyrophorer, im wesentlichen aus eisen bestehender ferromagnetischer nadelfoermiger metallteilchen
DE3901027A1 (de) * 1989-01-14 1990-07-26 Studiengesellschaft Kohle Mbh Nadelfoermige eisen-magnetpigmente mit einstellbarer koezitivfeldstaerke und verfahren zu deren herstellung
US8653824B1 (en) * 2009-12-16 2014-02-18 Western Digital (Fremont), Llc Delta temperature test method and system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206338A (en) * 1963-05-10 1965-09-14 Du Pont Non-pyrophoric, ferromagnetic acicular particles and their preparation

Also Published As

Publication number Publication date
NL7103820A (fr) 1971-11-24
DE2118103B2 (de) 1973-01-25
DE2118103A1 (de) 1972-02-03
JPS515608B1 (fr) 1976-02-21
GB1291406A (en) 1972-10-04
FR2090199B1 (fr) 1974-05-31
US3623859A (en) 1971-11-30
FR2090199A1 (fr) 1972-01-14
NL141686B (nl) 1974-03-15

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Legal Events

Date Code Title Description
RE20 Patent expired

Owner name: AMPEX MEDIA CORP.

Effective date: 19910518