公开(公告)号：US3620841A

公开(公告)日：1971-11-16

申请号：US3620841D

申请日：1970-02-16

Applicant: IBM

Inventor： COMSTOCK RICHARD LAWRENCE ,  MOORE EUGENE B

IPC: C09D5/23 ,  H01F10/20 ,  H01F10/02

CPC classification number: H01F10/20

Abstract: A continuous magnetite film, suitable for magnetic recording, is prepared by forming a film of amorphous Fe2O3, heating the Fe2O3 until it is completely converted to the alpha crystalline phase, and then reducing it to magnetite.

公开(公告)号：US3573099A

公开(公告)日：1971-03-30

申请号：US3573099D

申请日：1969-12-22

Applicant: IBM

Inventor： MOORE EUGENE B ,  NEPELA DANIEL A

IPC: C01G49/00 ,  C03C17/23 ,  C30B7/00 ,  C30B29/28 ,  G11B5/02 ,  G11C13/06 ,  H01F10/24 ,  H01F41/22 ,  H01F41/28 ,  C04B35/16 ,  C04B35/50

CPC classification number: H01F41/28 ,  C30B7/005 ,  H01F10/24 ,  Y10T428/265

Abstract: CRACK FREE GARNET FILMS ARE DEPOSITED ON A GLASS SUBSTRATE. THE GLASS SUBSTRATE MUST HAVE A LOW LEAD CONTENT AND A THERMAL EXPANSION COEFFICIENT WITHIN THE RANGE 85X10**7 TO 105X10**7 AND AN ANNEALING TEMPERATURE OF ABOVE 750*C. GD3FE5O12 IS DEPOSITED IN A PLURALITY OF LAYERS, THE FIRST ONE OF WHICH IS LESS THAN 0.25 MICRON THICK. THE FIRST LAYER IS HEATED TO COMPLETE CRYSTALLIZATION PRIOR TO DEPOSITING ANY ADDITIONAL LAYER. THERE IS A FINAL HEATING TO COMPLETE CRYSTALLIZATION AFTER THE LAST DEPOSITION.

公开(公告)号：CA943332A

公开(公告)日：1974-03-12

申请号：CA101452

申请日：1970-12-24

Applicant: IBM

Inventor： COMSTOCK RICHARD L ,  MOORE EUGENE B

IPC: C09D5/23 ,  H01F10/20