JPS54128496A - Magnetic powder - Google Patents

Magnetic powder

Info

Publication number
JPS54128496A
JPS54128496A JP3697378A JP3697378A JPS54128496A JP S54128496 A JPS54128496 A JP S54128496A JP 3697378 A JP3697378 A JP 3697378A JP 3697378 A JP3697378 A JP 3697378A JP S54128496 A JPS54128496 A JP S54128496A
Authority
JP
Japan
Prior art keywords
magnetic powder
magnetic
regulated
powder
coercive force
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.)
Pending
Application number
JP3697378A
Other languages
Japanese (ja)
Inventor
Toshihiro Hamahata
Shinji Umeki
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP3697378A priority Critical patent/JPS54128496A/en
Publication of JPS54128496A publication Critical patent/JPS54128496A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To provide γ-Fe2O3 magnetic powder with small particle size and high coercive force useful as a high density magnetic recording medium of high performance.
CONSTITUTION: The γ-Fe2O3 magnetic powder for a magnetic medium has a BET specific surface area above 40 and a coercive force above 380 Oe. This powder can be produced as follows: the ratio of anion such as sulfate ion to Fe2+ in ferrous sulfate or the like is regulated to below 1. The regulated ferrous sulfate is then oxidized with air, and the resulting needle-like goethite is subjected to heat dehydration, reduction and oxidation.
COPYRIGHT: (C)1979,JPO&Japio
JP3697378A 1978-03-30 1978-03-30 Magnetic powder Pending JPS54128496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3697378A JPS54128496A (en) 1978-03-30 1978-03-30 Magnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3697378A JPS54128496A (en) 1978-03-30 1978-03-30 Magnetic powder

Publications (1)

Publication Number Publication Date
JPS54128496A true JPS54128496A (en) 1979-10-05

Family

ID=12484683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3697378A Pending JPS54128496A (en) 1978-03-30 1978-03-30 Magnetic powder

Country Status (1)

Country Link
JP (1) JPS54128496A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4914400A (en) * 1972-05-23 1974-02-07
JPS49114800A (en) * 1973-03-09 1974-11-01

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4914400A (en) * 1972-05-23 1974-02-07
JPS49114800A (en) * 1973-03-09 1974-11-01

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