Direct observation of frozen moments in the NiFe/FeMn exchange bias system

Mohanty, Jyoti Ranjan and Persson, A and Arvanitis, D and Temst, K and Van Haesendonck, C (2013) Direct observation of frozen moments in the NiFe/FeMn exchange bias system. New Journal of Physics, 15. pp. 1-10. ISSN 1367-2630

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Abstract

We detect the presence of frozen magnetic moments in an exchange biased NiFe ferromagnet at the NiFe/FeMn ferromagnet/antiferromagnet interface by magnetic circular dichroism in x-ray absorption and resonant reflectivity experiments. Frozen moments are detected by means of the element-specific hysteresis loops. A weak dichroic absorption with unidirectional anisotropy can be linked to frozen magnetic moments in the ferromagnet. A more pronounced exchange bias for increasing the thickness of the FeMn layer correlates with an increase in orbital moment for interface Ni atoms carrying a frozen moment. These atoms compose about a single monolayer, but only a fraction of the atoms contributes by means of a strongly enhanced orbital moment to the macroscopic exchange bias phenomenon. The microscopic spin-orbit energy associated with these few interface frozen moment atoms appears to be sufficient to account for the macroscopic exchange bias energy

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IITH Creators:

IITH Creators	ORCiD
Mohanty, Jyoti Ranjan	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Direct observations; Exchange bias; Ferromagnets; Magnetic circular dichroisms; Orbital moment; Resonant reflectivity; Spin orbits; Unidirectional anisotropy

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

Team Library

Date Deposited:

15 Dec 2014 12:10

Last Modified:

10 Nov 2017 05:12

URI:

http://raiithold.iith.ac.in/id/eprint/1129