| 发明名称 |
EXCHANGE COUPLING FILM AND METHOD FOR PRODUCTION THEREOF, MAGNETORESISTIVE EFFECT ELEMENT |
| 摘要 |
PROBLEM TO BE SOLVED: To enhance magnetic conversion characteristics by reducing the Barkhausen noise in a magnetoresistive effect element more effectively through higher exchange coupling strength and structural stability. SOLUTION: An exchange coupling film comprises an antiferromagnetic film 3 of IrMn alloy having composition shown by IrxMn1-x (0.2<x<0.30), and a ferromagnetic film 4 formed sequentially on a substrate 1 through an underlying layer 2 of Ta. The antiferromagnetic film is ordered without requiring heat treatment and has a conventionally unknown Mn rich hexagonal structure of 3H shown by Ir2Mn7 thus realizing a significantly higher exchange coupling field. Exchange coupling field is increased furthermore when the hexagonal structure has a-axis and c-axis falling in such ranges as 2.40Å<a<2.95Åand 5.90Å<c<7.20Å. The structure is stabilized and a high exchange coupling field is attained when antiferromagnetic film contains twin having thickness of 5.90Å-300Åin the direction perpendicular to the twin face at high density and the tin face makes an angle of 10-40 deg. to the film surface.
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| 申请公布号 |
JP2001102215(A) |
申请公布日期 |
2001.04.13 |
| 申请号 |
JP19990272981 |
申请日期 |
1999.09.27 |
| 申请人 |
READ RITE CORP |
发明人 |
KAMEI KAZUTO;SAWAZAKI TATSUO;NAGAI HIDEYASU;UENO MASANORI;HIGAMI FUMINORI |
| 分类号 |
G11B5/39;H01F10/08;H01F10/26;H01F10/32;H01L43/08;(IPC1-7):H01F10/26 |
主分类号 |
G11B5/39 |
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