IMPROVED EXCHANGE COUPLING BETWEEN FERROMAGNETIC NI-FE AND ANTIFERROMAGNETIC NI-MN-BASED FILMS

被引：168

作者：

LIN, T ^{[1
]}

MAURI, D ^{[1
]}

STAUD, N ^{[1
]}

HWANG, C ^{[1
]}

HOWARD, JK ^{[1
]}

GORMAN, GL ^{[1
]}

机构：

[1] IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120

来源：

APPLIED PHYSICS LETTERS | 1994年 / 65卷 / 09期

关键词：

D O I：

10.1063/1.112140

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Dc magnetron sputtered Ni-Mn and Ni-Mn-Cr films are demonstrated to exhibit strong and thermally stable antiferromagnetism, as well as high corrosion resistance. For a 25.2 nm thick 53.3 Ni-46.7 Mn (in atomic percent) film deposited on top of a 28.5 nm thick 81 Ni-19 Fe film, a unidirectional anisotropy field (H(UA)) of 120.6 Oe is obtained at room temperature after annealing in vacuum. The equivalent interfacial exchange coupling energy (J(K)) is 0.27 erg/cm, three times higher than that of bilayer Ni-Fe/50Fe-50Mn films. This strong exchange coupling appears correlated with the presence of an antiferromagnetic theta (NiMn) phase with a CuAu-I-type ordered face-centered-tetragonal structure. The blocking temperature, at which the exchange coupling disappears, is higher than 400-degrees-C. The Cr addition to the Ni-Mn film dilutes the exchange coupling, but the J(K) for the Cr content less-than-or-equal-to 10.7 at. %, is still higher than that of the Ni-Fe/Fe-Mn films. Both Ni-Mn and Ni-Mn-Cr films exhibit corrosion behaviors much better than the Fe-Mn film and comparable to the Ni-Fe film. The films are proposed as longitudinal bias layers for the stabilization of magnetoresistive read sensors.

引用

页码：1183 / 1185

页数：3

共 15 条

[1] PERMANENT-MAGNET FILMS FOR BIASING OF MAGNETORESISTIVE TRANSDUCERS [J].