Method of adjusting CoFe free layer magnetostriction

Details Method of adjusting CoFe free layer magnetostriction Method of adjusting CoFe free layer magnetostriction

2006-02-14

2006-02-14

Meeks, Timothy (Department: 1762)

Coating processes

Magnetic base or coating

Magnetic coating

C427S131000, C427S132000, C427S419300

Reexamination Certificate

active

06998150

ABSTRACT:
It has been found that the insertion of a copper laminate within CoFe, or a CoFe/NiFe composite, leads to higher values of CPP GMR and DRA. However, this type of structure exhibits very negative magnetostriction, in the range of high −10−6to −10−5. This problem has been overcome by giving the copper laminates an oxygen exposure treatment When this is done, the free layer is found to have a very low positive magnetostriction constant. Additionally, the value of the magnetostriction constant can be adjusted by varying the thickness of the free layer and/or the position and number of the oxygen treated copper laminates.

REFERENCES:
patent: 5627704 (1997-05-01), Lederman et al.
patent: 5668688 (1997-09-01), Dykes et al.
patent: 6118624 (2000-09-01), Fukuzawa
patent: 6652906 (2003-11-01), Pinarbasi
patent: 6731477 (2004-05-01), Lin et al.
patent: 6747852 (2004-06-01), Lin et al.
patent: 2003/0030944 (2003-02-01), Lin et al.

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