期刊
PHYSICA B
卷 283, 期 1-3, 页码 194-198出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0921-4526(99)01938-9
关键词
off-specular scattering; magnetic multilayer; interface roughness; DWBA
The magnetic structure of a [Cr(9 Angstrom)/Fe-57 (68 Angstrom)] x 12 multilayer on sapphire substrate has been studied with polarized neutron reflectometry. The intensity distribution was measured over a broad range of incident and outgoing angles with spin analysis. The specular and off-specular intensities of the first and second-order Bragg-peaks (determined by the hi-layer thickness) and those at the half-order positions (due to an antiferromagnetic coupling) were measured. Off-specular scattering arranged into sheets running across the antiferromagnetic half-order positions is spread over an appreciable range perpendicular to the specular line. It consists of almost totally spin-flip scattering Nearly no experimental evidence of the peak at the position of antiferromagnetic superstructure is found in the spin-hip specular channel. The intensity of the diffuse scattering scales with the intensity of the Bragg peaks, which is a function of the external magnetic field. These findings result in a picture of antiferromagnetic domains, lather than in the model of homogeneous magnetized neighbouring layers with a magnetization coupling angle. (C) 2000 Elsevier Science B.V. All rights reserved.
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