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Perspectives of polarized-neutron reflectometry: magnetic domains and off-specular scattering

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Applied Surface Science

Volume 182, Issues 3-4
22 October 2001
Pages 209-215

DOI: 10.1016/S0169-4332(01)00413-5
PII: S0169-4332(01)00413-5
Copyright © 2001 Published by Elsevier Science B.V. All rights reserved.

G. P. Felcher ^, and S. G. E. te Velthuis

Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA

Available online 3 January 2002.

Specular reflectometry of polarized-neutrons was developed in the 1980s as a tool for measuring magnetic depth profiles in flat films, which were laterally uniform. When the lateral uniformity breaks down in an assembly of domains, off-specular grazing incidence scattering takes place. This review discusses this new frontier of reflectometry, describing the advances that are taking place in linking the observations of the scattering at grazing incidence with the size, the statistics, and the magnetic orientation of the domains. The article discusses also the progress made in linking the domain distribution thus found with the transport properties of these nanomagnetic systems.

Author Keywords: Polarized-neutron reflectivity; Off-specular scattering; Magnetic thin films; Multilayers; Domains

1. The image of antiferromagnetic domains
2. Antiferromagnetic domains: the Born approximation
3. Evolution of the methods of analysis
4. Domain size and transport properties
Acknowledgements
References

(12K)
Fig. 1. Geometry of scattering at grazing incidence: specular reflection (

_i=

_f), scattering in the specular plane (

=0) and off the specular plane.

(6K)
Fig. 2. An AF superlattice of Fe/Cr, and its breakdown into AF domains.

(17K)
Fig. 3. Off-specular scattering from an AF Fe/Cr multilayer: the contours are plotted vs. neutron wavelength and angle of scattering. Sizeable scattering occurs around the AF (1/2) peak [3].

(13K)
Fig. 4. Contour plot of an AF Fe/Cr multilayer, as a function of the angles of incidence

_in (=_i) and scattering

_final (=_f). The large peaks on the diagonal are AF [4].

(9K)
Fig. 5. Contour plot of an AF Fe/Cr multilayer, as a function of q_x, q_z. The strong innermost peak along the line q_x=0 is AF; the outer weak one is structural [5].

(12K)
Fig. 6. The diffuse scattering observed at the AF peak of a Co/Cu multilayer as a function of applied field. The lines are fits to the data [9].

(11K)
Fig. 7. Field dependence of the magnetization, the magnetoresistance and the domain fitting parameter for a Co/Cu multilayer [9].

Subject View:

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Corresponding author. Tel.: +1-630-252-5516; fax: +1-630-252-7777; email: felcher@anl.gov

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Applied Surface Science
Volume 182, Issues 3-4
22 October 2001
Pages 209-215

7 of 45

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