EP0108074A4 - Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung. - Google Patents

Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung.

Info

Publication number: EP0108074A4
Authority: EP; European Patent Office
Prior art keywords: gap; sendust; ferrite; magnetic; pole
Prior art date: 1982-05-04
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 Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Withdrawn

Application number

EP19830901054

Other languages

English (en)

French (fr)

Other versions

EP0108074A1 (de

Inventor

Richard J Mcclure

John F Bagby

Frederick J Jeffers

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.)

Eastman Kodak Co

Original Assignee

Eastman Kodak Co

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.)

1982-05-04

Filing date

1983-02-25

Publication date

1984-10-29

1983-02-25 Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co

1984-05-16 Publication of EP0108074A1 publication Critical patent/EP0108074A1/de

1984-10-29 Publication of EP0108074A4 publication Critical patent/EP0108074A4/de

Status Withdrawn legal-status Critical Current

Links

230000005291 magnetic effect Effects 0.000 title claims description 35
229910000859 α-Fe Inorganic materials 0.000 claims abstract description 48
229910000702 sendust Inorganic materials 0.000 claims abstract description 41
239000000463 material Substances 0.000 claims abstract description 30
230000005415 magnetization Effects 0.000 claims abstract description 12
238000000034 method Methods 0.000 claims description 10
238000004544 sputter deposition Methods 0.000 claims description 10
239000000696 magnetic material Substances 0.000 claims description 7
238000000151 deposition Methods 0.000 claims description 4
238000004519 manufacturing process Methods 0.000 claims description 4
230000008021 deposition Effects 0.000 claims description 3
238000000992 sputter etching Methods 0.000 claims description 2
230000004907 flux Effects 0.000 abstract description 8
239000003292 glue Substances 0.000 abstract description 3
239000011162 core material Substances 0.000 description 22
230000035699 permeability Effects 0.000 description 13
230000000694 effects Effects 0.000 description 11
238000000576 coating method Methods 0.000 description 9
239000011248 coating agent Substances 0.000 description 6
KKEBXNMGHUCPEZ-UHFFFAOYSA-N 4-phenyl-1-(2-sulfanylethyl)imidazolidin-2-one Chemical compound N1C(=O)N(CCS)CC1C1=CC=CC=C1 KKEBXNMGHUCPEZ-UHFFFAOYSA-N 0.000 description 3
230000008901 benefit Effects 0.000 description 3
238000010586 diagram Methods 0.000 description 3
125000006850 spacer group Chemical group 0.000 description 3
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
230000008859 change Effects 0.000 description 2
230000007423 decrease Effects 0.000 description 2
238000009826 distribution Methods 0.000 description 2
239000010408 film Substances 0.000 description 2
239000011521 glass Substances 0.000 description 2
230000006872 improvement Effects 0.000 description 2
239000004593 Epoxy Substances 0.000 description 1
XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
229910052782 aluminium Inorganic materials 0.000 description 1
238000013459 approach Methods 0.000 description 1
238000010420 art technique Methods 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
238000011161 development Methods 0.000 description 1
230000018109 developmental process Effects 0.000 description 1
230000003628 erosive effect Effects 0.000 description 1
150000002500 ions Chemical class 0.000 description 1
229910052742 iron Inorganic materials 0.000 description 1
238000012986 modification Methods 0.000 description 1
230000004048 modification Effects 0.000 description 1
229910000889 permalloy Inorganic materials 0.000 description 1
238000002360 preparation method Methods 0.000 description 1
229910052710 silicon Inorganic materials 0.000 description 1
239000010703 silicon Substances 0.000 description 1
238000005482 strain hardening Methods 0.000 description 1
229910002058 ternary alloy Inorganic materials 0.000 description 1
239000010409 thin film Substances 0.000 description 1

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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/23—Gap features
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/1875—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers
- G11B5/1877—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film
- G11B5/1878—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film disposed immediately adjacent to the transducing gap, e.g. "Metal-In-Gap" structure
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/23—Gap features
- G11B5/232—Manufacture of gap

Definitions

Fig. 7 is a diagram useful in describing the invention.
a high energy recording medium which the assignee hereof has employed has a typical coercivity of 850 oersteds, a saturation magnetization of 1600 gauss, a permeability of about two, a nominal 90 percent of saturation remanence that occurs for an applied field H of about 1375 oersteds, and a nominal 10 percent of saturation remanence that occurs for an applied field of about 500 oersteds.
FIG. 2 shows a magnetic head comprised of a « 5 ferrite core 10 having a non-magnetic transducer gap 12 defined by Sendust pole pieces 14 bonded at 16 to the ferrite core 10.
a magnetic head constitutes a compromise at best: relatively high permeability and eddy-current limiting is provided by the ferrite core 10; and high satura ⁇ tion magnetization is provided by the Sendust pole pieces 14 at relatively little sacrifice in overall permeability.
the general concept of the invention is to coat at least the trailing pole face of a pair of ferrite pole faces, which define a transducer gap, with high-saturation material such as Sendust.
Fig. 3 which is similar to Fig. 1 but shows the existence of (sputtered) coatings 18 of Sendust on both ferrite pole parts 20.
the coatings are between about 0.25 and 2.0 microns thick, the showing of Fig. 3 being clearly not to scale. Notwithstanding this intentional mis-showing (for ease of comparison with Fig.
Beilby layer is removed, for example, by ion milling away several microns of the ferrite pole face part prior to the sputtering procedure.
a non-magnetic gap spacer material 36 e.g. SiO
Sendust-coated chamfered half-bar 37 is brought into face-to-face relationship with the first half-bar (39).

Landscapes

Engineering & Computer Science (AREA)
Manufacturing & Machinery (AREA)
Magnetic Heads (AREA)

EP19830901054 1982-05-04 1983-02-25 Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung. Withdrawn EP0108074A4 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US37466582A	1982-05-04	1982-05-04
US374665		1982-05-04

Publications (2)

Publication Number	Publication Date
EP0108074A1 EP0108074A1 (de)	1984-05-16
EP0108074A4 true EP0108074A4 (de)	1984-10-29

Family

ID=23477719

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19830901054 Withdrawn EP0108074A4 (de)	1982-05-04	1983-02-25	Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung.

Country Status (2)

Country	Link
EP (1)	EP0108074A4 (de)
WO (1)	WO1983003918A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
NL8400140A (nl) *	1984-01-17	1985-08-16	Philips Nv	Magneetkop.
NL8401116A (nl) *	1984-04-09	1985-11-01	Philips Nv	Magnetische leeskop met een meervoudige spleet.
JPH0770020B2 (ja) *	1985-06-14	1995-07-31	株式会社日立製作所	磁気ヘツド
EP0273496B1 (de) *	1986-12-03	1991-04-10	Koninklijke Philips Electronics N.V.	Magnetkopf mit einem elektro-chemisch inerten Spalt aus hartem Material
US5278716A (en) *	1987-07-14	1994-01-11	Sanyo Electric Co.	Magnetic head with suppressed generation of pseudogap
US5195004A (en) *	1987-07-14	1993-03-16	Sanyo Electric Co., Ltd.	Method of manufacturing a magnetic core half
JP2781849B2 (ja) *	1987-07-14	1998-07-30	三洋電機株式会社	磁気ヘッド及びその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CH332872A (de) *	1954-02-27	1958-09-30	Luxor Industri Ab	Magnetkopf mit einem Kern aus Ferrit
DE2634156A1 (de) *	1975-07-29	1977-02-03	Olympus Optical Co	Verfahren zum herstellen von magnetkoepfen
US4241367A (en) *	1978-03-03	1980-12-23	Matsushita Electric Industrial Co., Ltd.	Thin film magnetic head

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS543517A (en) *	1977-06-09	1979-01-11	Sony Corp	Erasing head
US4302790B1 (en) *	1979-04-11	1999-06-08	Eastman Kodak Co	Magnetic recording head with effective magnetic gap length less than about 15mu inches

1983
- 1983-02-25 WO PCT/US1983/000260 patent/WO1983003918A1/en not_active Ceased
- 1983-02-25 EP EP19830901054 patent/EP0108074A4/de not_active Withdrawn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CH332872A (de) *	1954-02-27	1958-09-30	Luxor Industri Ab	Magnetkopf mit einem Kern aus Ferrit
DE2634156A1 (de) *	1975-07-29	1977-02-03	Olympus Optical Co	Verfahren zum herstellen von magnetkoepfen
US4241367A (en) *	1978-03-03	1980-12-23	Matsushita Electric Industrial Co., Ltd.	Thin film magnetic head

Non-Patent Citations (15)

* Cited by examiner, † Cited by third party
Title
1978 DIGESTS OF THE INTERMAG CONFERENCE, 9th-12th May 1978, Florence, page 7-4, IEEE, New York, US; F. KOBAYASHI et al.: "A high sensitivity video head developed for VHS player" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 12, no. 12, May 1970, page 2321, New York, US; W. NYSTROM: "Hybrid ferrite head for high-density recording" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 18, no. 5, October 1975, page 1311, New York, US; M.A. GRIMM: "Ferrite treatment" *
PATENT ABSTRACTS OF JAPAN, vol. 2, no. 84, 8th July 1978, page 3545 E 78; & JP-A-53 047 811 (MATSUSHITA DENKI SANGYO K.K.) 28-04-1978 *
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 100 (P-19)[582], 8th July 1980, page 78 P 19; & JP-A-55 058 824 (SANYO DENKI K.K.) 01-05-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 36 (P-51)[708], 7th March 1981; & JP-A-55 157 121 (NIPPON DENSHIN DENWA KOSHA) 06-12-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 48 (P-55)[720], 7th April 1981; & JP-A-56 003 424 (HITACHI SEISAKUSHO K.K.) 14-01-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 145 (P-132)[1023], 4th August 1982; & JP-A-57 064 324 (HITACHI SEISAKUSHO K.K.) 19-04-1982 (Cat. A) *
PATENTS ABSTRACTS OF JAPAN, vol. 2, no. 84, 8th July 1978, page 3545 E 78; & JP - A - 53 47 811 (MATSUSHITA DENKI SANGYO K.K.) 28-04-1978 *
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 100 (P-19)[582], 8th July 1980, page 78 P 19; & JP - A - 55 58 824 (SANYO DENKI K.K.) 01-05-1980 *
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 36 (P-51)[708], 7th March 1981; & JP - A - 55 157 121 (NIPPON DENSHIN DENWA KOSHA) 06-12-1980 *
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 48 (P-55)[720], 7th April 1981; & JP - A - 56 3424 (HITACHI SEISAKUSHO K.K.) 14-01-1981 *
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 145 (P-132)[1023], 4th August 1982; & JP - A - 57 64 324 (HITACHI SEISAKUSHO K.K.) 19-04-1982 (Cat. A) *
RESEARCH DISCLOSURE, no. 225, January 1983, page 17, disclosure no. 22511, Havant, Hampshire, GB; "Magnetic head having highly saturable gap liner" *
See also references of WO8303918A1 *

Also Published As

Publication number	Publication date
EP0108074A1 (de)	1984-05-16
WO1983003918A1 (en)	1983-11-10

Legal Events

Date	Code	Title	Description
1984-03-17	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1984-05-16	AK	Designated contracting states	Designated state(s): DE FR GB NL
1984-07-04	17P	Request for examination filed	Effective date: 19840421
1985-05-13	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN
1985-07-17	18W	Application withdrawn	Withdrawal date: 19850422
2007-08-08	RIN1	Information on inventor provided before grant (corrected)	Inventor name: BAGBY, JOHN F. Inventor name: MCCLURE, RICHARD J. Inventor name: JEFFERS, FREDERICK J.

Publication	Publication Date	Title
JPH0477370B2 (de)	1992-12-08
JPH0542726B2 (de)	1993-06-29
JPS58155513A (ja)	1983-09-16	複合型磁気ヘツドおよびその製造方法
US4755899A (en)	1988-07-05	Magnetic transducer head having an alloy thin film of high saturation magnetic flux density slantly provided with respect to an operating magnetic gap formed therein
JPS60160008A (ja)	1985-08-21	磁気ヘツド
US5167062A (en)	1992-12-01	Method of manufacturing magnetic write/read head and fabrication method
WO1983003918A1 (en)	1983-11-10	Magnetic head having highly saturable gap liner
CA1236212A (en)	1988-05-03	Magnetic transducer head with slanted thin film
KR100226845B1 (ko)	1999-10-15	자기헤드
JPH03120604A (ja)	1991-05-22	複合型磁気ヘッド用コアの製造方法
JP3104185B2 (ja)	2000-10-30	磁気ヘッド
JPH0519762B2 (de)	1993-03-17
JPS63306505A (ja)	1988-12-14	複合型磁気ヘッド用コアの製造法
JPS613309A (ja)	1986-01-09	磁気ヘツド
JPS6015806A (ja)	1985-01-26	磁気ヘツドおよびその製造方法
JPH034963B2 (de)	1991-01-24
JPH05282619A (ja)	1993-10-29	磁気ヘッド
JPS59500738A (ja)	1984-04-26	高可飽和ギャップライナを備えた磁気ヘッド
JPS61294618A (ja)	1986-12-25	磁気ヘツドの製造方法
JPH07105506A (ja)	1995-04-21	磁気ヘッドの製造方法
JPH04341908A (ja)	1992-11-27	複合磁気ヘッド
JPS61229211A (ja)	1986-10-13	磁気ヘツド
JPH0388109A (ja)	1991-04-12	垂直磁気記録用磁気ヘッド
JPH0748245B2 (ja)	1995-05-24	磁気ヘッド
JPS63108510A (ja)	1988-05-13	磁気ヘツド