FR2090199B1 - - Google Patents

Info

Publication number
FR2090199B1
FR2090199B1 FR7114072A FR7114072A FR2090199B1 FR 2090199 B1 FR2090199 B1 FR 2090199B1 FR 7114072 A FR7114072 A FR 7114072A FR 7114072 A FR7114072 A FR 7114072A FR 2090199 B1 FR2090199 B1 FR 2090199B1
Authority
FR
France
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
FR7114072A
Other versions
FR2090199A1 (fr
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.)
Ampex Corp
Original Assignee
Ampex Corp
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 Corp filed Critical Ampex Corp
Publication of FR2090199A1 publication Critical patent/FR2090199A1/fr
Application granted granted Critical
Publication of FR2090199B1 publication Critical patent/FR2090199B1/fr
Expired legal-status Critical Current

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)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
FR7114072A 1970-05-22 1971-04-21 Expired FR2090199B1 (fr)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
FR2090199A1 FR2090199A1 (fr) 1972-01-14
FR2090199B1 true FR2090199B1 (fr) 1974-05-31

Family

ID=21907838

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7114072A Expired FR2090199B1 (fr) 1970-05-22 1971-04-21

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
US4305752A (en) * 1979-07-30 1981-12-15 Pfizer Inc. Metallic iron particles for magnetic recording
US4256484A (en) * 1979-07-30 1981-03-17 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
US3623859A (en) 1971-11-30
DE2118103A1 (de) 1972-02-03
FR2090199A1 (fr) 1972-01-14
BE767308A (fr) 1971-10-18
GB1291406A (en) 1972-10-04
NL141686B (nl) 1974-03-15
DE2118103B2 (de) 1973-01-25
NL7103820A (fr) 1971-11-24
JPS515608B1 (fr) 1976-02-21

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