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Element-Specific Magnetization Reversal in Fe/Ce Multilayers

Published online by Cambridge University Press:  21 February 2011

M. Munzenberg ,
M. Arend ,
W. Felsch ,
S. Pizzini ,
A. Fontaine ,
T. Neisius  and
S. Pascarelli
M. Munzenberg*
Affiliation:
I. Physikalisches Institut, Universität Gittingen, Bunsenstr.9, 37077 Göttingen, Germany
M. Arend
Affiliation:
I. Physikalisches Institut, Universität Gittingen, Bunsenstr.9, 37077 Göttingen, Germany
W. Felsch
Affiliation:
I. Physikalisches Institut, Universität Gittingen, Bunsenstr.9, 37077 Göttingen, Germany
S. Pizzini
Affiliation:
Laboratoire Louis Néel, CNRS, BP 166, 38042 Grenoble Cedex, France
A. Fontaine
Affiliation:
Laboratoire Louis Néel, CNRS, BP 166, 38042 Grenoble Cedex, France
T. Neisius
Affiliation:
European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
S. Pascarelli
Affiliation:
European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
*
Corresponding author, electronic address: mmuenze@gwdg.de
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Abstract

Fe/Ce multilayers are magnetically soft with coercive fields of a few Oersteds. In these structures the Ce-5d states are magnetically polarized by hybridization with the 3d states of Fe. The element selectivity of X-ray magnetic circular dichroism (XMCD) is used to measure the magnetization reversal of the Ce-5d states at room temperature. Comparison with the macroscopic magnetization curves studied by the magnetooptical Kerr effect (MOKE) reveal that the ordered Ce-5d moment is not directly coupled to the overall Fe-layer magnetization: the coercitivity of the Ce hysteresis is reduced a factor of two. In view of previous 57Fe Mössbauer spectra this is attributed to an effect of the interface where nominally 1 atomic layer of Fe and Ce are intermixed. Magnetization reversal is initiated in this region due to a reduced magnetocrystalline anisotropy and then propagates into the Fe layers. This interpretation is supported by an experiment on a hydrided multilayer Fe/CeH2.6_6: In this case, there is no intermixing at the interfaces and the magnetization of the Ce-5d electrons follows the Fe-layer magnetization directly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 575
Copyright
Copyright © Materials Research Society 1999

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References

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