Magnetic dead layers in sputtered Co40Fe40B20 films

被引：39

作者：

Oguz, K. ^{[1
]}

Jivrajka, P.

Venkatesan, M.

Feng, G.

Coey, J. M. D.

机构：

[1] Univ Dublin Trinity Coll, CRANN, Dublin 2, Ireland

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 07期

基金：

爱尔兰科学基金会;

关键词：

D O I：

10.1063/1.2838851

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnetic moment of Co(40)Fe(40)B(20) electrodes has been investigated as a function of thickness for films prepared by magnetron sputtering on Si/SiO(2)/MgO and Si/SiO(2) substrates. On MgO, the metal film becomes discontinuous and superparamagnetic with no stable ferromagnetic moment below 1.0 nm, whereas on Si/SiO(2), there appears to be a 0.7 nm dead region for all film thicknesses. The dead layer is attributed to an interdiffusion region at the interface with the substrate where there are weakly coupled noncollinear spins and a 0.2 nm dead layer associated with the Ta cap. The discontinuous ferromagnetic films maybe useful for the wide-range linear field sensors. (c) 2008 American Institute of Physics.

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