Magnetic multilayer film, method for making, and magnetoresistance device
US5661449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Aug 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N50/85
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnetic multilayer film having magnetoresistance (MR) is prepared by alternately depositing first and second magnetic layers while interposing a non-magnetic metal layer therebetween. The number of the first magnetic layers N1 and the number of the second magnetic layers N2 having greater coercivity than the first magnetic layers are in the range: 2.ltoreq.N1.ltoreq.4 and N2=N1-1. The first magnetic layer has a thickness t1 of 10-80 .ANG., second magnetic layer has a thickness t2 of 20-90 .ANG., and non-magnetic metal layer has a thickness t3 of 20-90 .ANG.. The magnetic multilayer film comprising a less number of layers has a great MR ratio, a linear rise of an MR curve in proximity to zero magnetic field, and high sensitivity to a magnetic field. It also has a greater MR slope upon application of a high frequency magnetic field in proximity to zero magnetic field and withstands high temperatures. The magnetic multilayer film is used as a magneto-sensitive section to provide high performance MR devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.