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Magnetic Structure Determination for Annealed Ni80Fe20/Ag Multilayers Using Polarized-Neutron Reflectivity

Published online by Cambridge University Press:  22 February 2011

J.A. Borchers ,
P.M. Gehring ,
C.F. Majkrzak ,
J.F. Ankner ,
T.L. Hylton ,
K.R. Coffey ,
M.A. Parker  and
J.K. Howard
J.A. Borchers
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
P.M. Gehring
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
C.F. Majkrzak
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
J.F. Ankner
Affiliation:
University of Missouri, Research Reactor Facility, Columbia, MO 65211
T.L. Hylton
Affiliation:
IBM Storage Systems Division, 5600 Cottle Road, San Jose, CA 95193
K.R. Coffey
Affiliation:
IBM Storage Systems Division, 5600 Cottle Road, San Jose, CA 95193
M.A. Parker
Affiliation:
IBM Storage Systems Division, 5600 Cottle Road, San Jose, CA 95193
J.K. Howard
Affiliation:
IBM Storage Systems Division, 5600 Cottle Road, San Jose, CA 95193
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Abstract

Sputtered Ni80Fe20/Ag multilayers, annealed post-growth, show giant magnetoresistive (GMR) effects at unusually low magnetic fields (≈ 5 Oe)[l]. Structural characterization by cross-sectional TEM[2] and x-ray diffraction indicates that the Ag preferentially diffuses into the Ni80Fe20 layers at the interfaces. Using polarized-neutron specular reflectivity, we have obtained magnetization depth profiles for a series of annealed [Ni8oFe2o(20Å)/Ag(40Å)]4 multilayers. Though GMR in related materials is associated with coherent antiferromagnetic alignment of the ferromagnetic layers, specular neutron data for the Ni80Fe20/Ag multilayers show no trace of half-order spin-flip intensity characteristic of this simple structure. In small applied fields, transverse scans at the half-order position show a broad feature which disappears upon saturation. These data suggest that while the Ni80Fe20 moments are antiferromagnetically correlated along the growth axis, the in-plane magnetic domains are only of micron-order size and are thus not apparent in a specular measurement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 577
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1 Hylton, T.L., Coffey, K.R., Parker, M.A. and Howard, J.K., Science 261, 1021 (1993); T.L. Hylton, K.R. Coffey, M.A. Parker and J.K. Howard, J. Appl. Phys. 75, 7058 (1994).Google Scholar
2 Parker, M.A., Hylton, T.L., Coffey, K.R. and Howard, J.K., J. Appl. Phys. 75, 6382 (1994).Google Scholar
3 Baibich, M.N., Broto, J.M., Fert, A., Nguyen Van Dau, F., Petroff, F., Eitenne, P., Creuzet, G., Friederich, A. and Chazelas, J., Phys. Rev. Lett. 61, 2472 (1988).Google Scholar
4 Parkin, S.S.P., Phys. Rev. Lett. 67, 3598 (1991).Google Scholar
5 Berkowitz, A.E., Mitchell, J.R., Carey, M.J., Young, A.P., Zhang, S., Spada, F.E., Parker, F.T., Hutten, A. and Thomas, G., Phys. Rev. Lett. 68, 3745 (1992).Google Scholar
6 Xiao, J.Q., Jiang, J.S. and Chien, C.L., Phys. Rev. Lett. 68, 3749 (1992).Google Scholar
7 Parkin, S.S.P., More, N. and Roche, K.P., Phys. Rev. Lett. 64, 2304 (1990).Google Scholar
8 Hylton, T.L., Appl. Phys. Lett. 62, 2431 (1993).Google Scholar
9 Farrow, R.F.C., Marks, R.F., Rabedeau, T.A., Toney, M.F., Dobbertin, D., Beyers, R. and Parkin, S.S.P., J. Appl. Phys. 76, 3688 (1994).Google Scholar
10 Tsui, F., Flynn, C.P., Salamon, M.B., Borchers, J.A., Erwin, R.W. and Rhyne, J.J., J. Magn. Magn. Mater. 104–107, 1901 (1992).Google Scholar
11 Ankner, J.F. and Majkrzak, C.F., in Neutron Optical Devices and Applications, edited by Majkrzak, C.F. and Wood, J.L., SPIE Conferenc Proc. 1738, 260 (1992).Google Scholar
12 Due to interference effects from the cap and base layers, the x-ray fits are not highly sensitive to the relative thicknesses of the Ni80Fe20 and Ag layers or to their individual scattering densities. While these fits are not unique, they were guided by subsequent neutron reflectivity analysis.Google Scholar
13 Majkrzak, C.F., in Handbook of Neutron Scattering, edited by Glaser, W., Springer-Verlag (in press).Google Scholar
14 Takeda, J., Endoh, Y., Yasuda, H., Yamada, K., Kamijo, A. and Mizuki, J., J. Phys. Soc. Japan 62, 3015 (1993).Google Scholar